Yamaha Limited Pipe Specifications

Yamaha Limited Pipe Specifications

By Lynn Haddock

The approved RLV PIPES for the Yamaha Limited Class (#17) are the VKA-K1, VKA-K2 and the VKA-SR-Y.

These are the same pipes as the older model KPV K1 and K2 and the WKA/IKF SR-Y. These are readily available in the used market.

The current RLV HEADERS are the VKA-9110 (12 degrees) and the VKA-9110 (straight). However, any straight tube header may also be used. No tapered tube headers are allowed!

The minimum length for all the pipes is 12″ from the piston face to the start of the first cone. For convenience, the edge of the fin just above the exhaust (see Fig. 1, below) is 2.4″ from the piston.

 

FOR THE 90° PIPE

For the 90° models (K1+K2), this means, in order to have a minimum distance from the piston face to the end of the connector tube as 12″, the connector dimension has a combination of 2.4” + 9.6” = 12″ (see Fig. 2, below).

 

FOR THE 60°/30° PIPE

Unlike the 90° model, the 60°/30° model has 2.5″ of distance is made into the 60°/30° elbow (see Fig. 3), so the distance from the piston to the end of the connector tube is 9.5″ (2.4″ + 7.1″) minimum (see Fig. 4) and the overall minimum distance is 12″ (2.4″ + 7.1″ + 2.5″ = 12″).

There is no maximum length for any header. The connector tube is 1.750″ diameter.

For information on the RLV pipes go to: www.RLVcatelog.com. On the left, at the bottom, click on VKA Vintage Pipes. This page with the 90° and 60°/30° pipes will come up.

RLV PIPE CLARIFICATION BY LYNN HADDOCK

Several questions have arisen regarding the RLV pipe and the proper installation. Below is a picture of the 90° pipe (Fig. A) and the correct, minimum length of the connector tube (Fig. B)

Figure A
Figure B

Fig. C shows the 60°/30° pipe, and Fig. D shows the proper installation of the minimum connector tube.

Figure C
Figure D
History Lesson: Scott Kneisel Rebuilds the Mc8

History Lesson: Scott Kneisel Rebuilds the Mc8

As we have changed over from the old VKA website to the current one, some of the links to articles and photos just stopped working. Ryan Courts made a PDF copy of Scott Kneisel’ss Mc8 rebuild article and put it up on the VKA Facebook page. Although most of the information is specific to Mc8s, Scott’s 2-stroke rebuilding techniques (measuring/installing seals and bearings etc.) apply to virtually all kart engines.

As we recover some of this “old gold” we will repost it in its respective category on the new site. However, in an effort to conserve space on our new site, we will simply have a descriptive paragraph and photo about the content of the article followed by a new link to where it is archived.

Comments and suggestions always welcomed!

10th Annual VKA CAMDEN Vintage Event

10th Annual VKA CAMDEN Vintage Event

Camden, Ohio Aug. 26 -28, 2021

by Sherri and Jeff Brown

Another fabulous event.  Sure, it was hot, but look at the calendar … it was August!  Despite the heat and some lingering concerns about COVID … not to mention some personal issues and schedule conflicts with some larger teams … we had 78 entrants plus a couple practice-only. 

We had the pleasure of acknowledging several truly honorable, WKA Hall of Fame Members, and we were able to surprise one new inductee.  (Haul of Famers, Ron and Carma Withrow, Paul Martin, Neil Keller, Gary Gregg and Randy Kugler are pictured), but it was Gary Gregg, the owner of G & J Kartway and long-time supporter of karting who was totally taken off guard when his name was announced.   It was a pleasure to recognize his lifelong contribution to karting, WKA (founded at Camden), and Ohio Valley Karting Association (OVKA). 

We ran the scheduled 1st Heat on Friday, followed by the Kart Show and dinner.  Thanks to Romero Llamas, the Kart Show was a big success.   Check out the amazing karts that topped the list. 

Historic- Rathman Exterminator; Larry Stallard
Restored Historic; ’61 Big J Lancer; WB-820; Gordon Juhasz
Modified Historic; ’60 Simplex Challenger IV; Dual WB-820; John Gillman
Restored Rear Engine; ’67 Rupp Chaparral; MC-91; Chris Taylor
Modified Rear Engine; ’66 Rupp A-Bone; MC-91b; Jake Gillman
Past Champion Rear Engine; ’64 Fox Box Mount; 91b1- Rolf Hill 
Restored Sidewinder; “87 Margay Xpert; KT-100; Bill Arrandale
Past Champion Sidewinder; ’73 Bug; MC 91b1; Dan Bucher
Restored Sidewinder- ’78 Margay Pro X; Yamaha; Joe Cramer
PEOPLES’ CHOICE- ’78 Margay Pro X; Yamaha; Joe Cramer

Our President, Gary Wlodarsky and Track Cook/Clutch Guy, Jim Donovan served up a great meal of corn on the cob, burgers, bratts, complete with the sides and desert donated by Joann Hertzig.  I don’t think anyone went away hungry. 

Despite a “pop-up” deluge/mini hurricane after dinner, the track was fine for the two Heats on Saturday.  The results are below.  Our congratulations to all 78 entrants for some great demonstrations of what these old karts can do.  It was a safe event.  Everyone went home in the car/truck they came in. 

We can’t forget our hosts, the OVKA.  As always, they are the most accommodating and congenial group of track workers and flaggers, announcers, concession workers and registrations help.  Thank you.  And thanks to all who came.  God bless America.  See you next year.

Yamaha Piston Port Heat 1 start led off by Pete Vetter #23 and Ron Funkhauser #3
WKA Hall of Famers Ron & Carma Withrow (seated), Paul Martin, Neil Keller, Gary Gregg & Randy Kugler (standing left to right)
Looks like a fun ride – CKS sidewinder with TKM reed power
The essence of karting – a rear-engined SAE with a pair of Macs
No action shots, but Daniel Birges BM130-powered C/Open is worth looking at regardless of speed
Much credit to the events success goes to the Ohio Valley Karting Association
N.E. Regional Coordinator Skip Owen ran several classes with his beautifully prepared karts. This is his Sportsman Sidewinder entry.
Nice turn-key Margay Cheetah for sale. Lots of stuff for sale at most VKA events
Sportsman Sidewinder Heat 1 start with #85 Al Hasenfratz off the mark first, followed by Skip Owen #32 and Karl Ginter #3
150cc Sidewinder Heat 1 start with Craig Bennett on pole and Larry Pike #51 off pole
Restored Sidewinder & People’s Choice Winner, Joe Cramer cleaned up with his Yamaha-powered ’78 Margay Pro X
Sidewinder Past Champion Dan Bucher’s ’73 Bug with MC91b1 power is still looking good
Past Champion Rear Engine – Rolf Hill’s ’64 Fox Box Mount MC91b1
Jake Gillman’s ’66 Rupp A-Bone with MC91b power won the Modified Rear Engine class
Chris Taylor’s ’67 Rupp Chaparrel with MC91 power took Restored Rear Engine honors
Modified Historic was won by John Gillman ’60 Simplex Challenger IV, with dual WB820s
Restored Historic winner was Gordon Juhasz’s ’61 Big J Lancer with WB820 power
Historic winner was Larry Stallard’s Rathman Exterminator
Happy warriors Mark Story (getting ready to ride) and Daniel Birge soldier on in C/Open SW. Mark’s Emmick Elite was once owned and raced by West Coast George Ito. Now has K30 power
It was hot and sticky at Camden with everyone seeking refuge under any awning and tarp they could
A unique feature at Camden was the speed trap at the end of the straight. Here Pete Vetter clicks off a 56mph in Yamaha Piston Port. Craig Bennett tripped the clocks at 77mph in his C/Open sidewinder
Saving Those Heads

Saving Those Heads

How to Fix Destroyed Vintage Cylinder Heads

By Len Emanuelson

One of the real issues with running vintage kart motors is
that the parts are hard to find and are getting very expensive. There are a few
engines like TKM and a few IAME based engines that you can still buy new
replacement parts, but a typical cylinder head can be $250 or more. So it pays
to try to salvage what you have if you can. In most cases all that’s required
is a manual lathe and a $60 arbor from LAD.

I’m no machinist, but I have a lathe, and at the rate I blow
stuff up, I fix my own engines. In this case a friend brought me a TKM 150cc
cylinder head that had been pretty well beaten up by a piston failure. As you
can see in the “before” photo, we mapped out our strategy by numbering the
sequence of the surfaces to be machined. The objective is to end up with the
squish band the same relative distance from the sealing surface as it was
before machining. Another objective is to remove the least amount of material
possible, because it is the head’s total mass that acts as a heat sink, and
keeps your air-cooled motor cooling as efficiently as possible.

Follow along as we bring this cylinder head back
to life in less than one hour of time in the shop.

Step 1

First, inspect the damage to see if the head is even repairable without welding. We decided to first machine the cylinder sealing surface (#1) .020”, the head-to-muff surface (#2) .020” second and the squish band (#3) .020” third. If the squish band did not clean up at .020” we would have started over on all three surfaces with an additional .010” cut. The object is to remove the least possible amount of material and still restore the surfaces.
First, inspect the damage to see if the head is even repairable without welding. We decided to first machine the cylinder sealing surface (#1) .020”, the head-to-muff surface (#2) .020” second and the squish band (#3) .020” third. If the squish band did not clean up at .020” we would have started over on all three surfaces with an additional .010” cut. The object is to remove the least possible amount of material and still restore the surfaces.

Step 2

Here is the LAD cylinder head mandrel. It fits into the lathe chuck or collet and then the head screws on to the mandrel via the sparkplug threads.
Here is the LAD cylinder head mandrel. It fits into the lathe chuck or collet and then the head screws on to the mandrel via the sparkplug threads.

Step 3 & 4

Step3
The mandrel should stick out of the lathe chuck or collet just enough to screw on the head and clear the fins. This provides the least amount of runout for accurate machining.
The mandrel should stick out of the lathe chuck or collet just enough to screw on the head and clear the fins. This provides the least amount of runout for accurate machining.

Step 5

We first machined the head-to-barrel sealing surface. To do this we ran the lathe in reverse (clockwise) so that we could easily see the cutting tool. Important because the tool must cut all the way into the corner of the “step” for the liner. The cylinder must be very tight on the mandrel or it will unscrew from the force of the cutting tool.
We first machined the head-to-barrel sealing surface. To do this we ran the lathe in reverse (clockwise) so that we could easily see the cutting tool. Important because the tool must cut all the way into the corner of the “step” for the liner. The cylinder must be very tight on the mandrel or it will unscrew from the force of the cutting tool.

Step 6

Next we cut the surface above the muff. We ran the lathe in the normal rotation (CCW) for this operation.
Next we cut the surface above the muff. We ran the lathe in the normal rotation (CCW) for this operation.

Step 7

The angled squish band is machined with the “compound” part of the lathe. Foreign motors like the TKM, most Komets, etc. use approximately an 11.5-degree angle on the squish band. A good way to check the angle your compound (without the lathe running) is to touch-off the cutting tool on the inside edge of the squish band, back the tool carriage off .010” and then move the cutting tool to the outside edge of the squish band with the compound. It should be .010” away from the squish band if the compound angle is set correctly. If not adjust.
The angled squish band is machined with the “compound” part of the lathe. Foreign motors like the TKM, most Komets, etc. use approximately an 11.5-degree angle on the squish band. A good way to check the angle your compound (without the lathe running) is to touch-off the cutting tool on the inside edge of the squish band, back the tool carriage off .010” and then move the cutting tool to the outside edge of the squish band with the compound. It should be .010” away from the squish band if the compound angle is set correctly. If not adjust.

Step 8 & 9

Step8
After cutting the squish band the bowl-to-band parting line was still in pretty rough shape. We readjusted the cutting tool and took a light cut on the outside edge of the bowl area until the damaged area was gone.
After cutting the squish band the bowl-to-band parting line was still in pretty rough shape. We readjusted the cutting tool and took a light cut on the outside edge of the bowl area until the damaged area was gone.

Step 10

A piece of 400 grit sandpaper was used to blend the angle cuts and damage in the bowl area. Probably not how your shop teacher showed you how to do it, but as you can see in the finished photo, it works.
A piece of 400 grit sandpaper was used to blend the angle cuts and damage in the bowl area. Probably not how your shop teacher showed you how to do it, but as you can see in the finished photo, it works.

Step 11

The final check is to make sure the squish band is the correct diameter for your engine’s bore. We are using a 58.8mm piston, so the 58.85mm size is just about right. If your diameter is too small, cut the squish band deeper. If it is too big, cut the cylinder sealing surface some more. After you do a couple of these you’ll get the hang of juggling the dimensions for the desired results.
The final check is to make sure the squish band is the correct diameter for your engine’s bore. We are using a 58.8mm piston, so the 58.85mm size is just about right. If your diameter is too small, cut the squish band deeper. If it is too big, cut the cylinder sealing surface some more. After you do a couple of these you’ll get the hang of juggling the dimensions for the desired results.
2021 Avon 12th Annual Vintage Karting Reunion

2021 Avon 12th Annual Vintage Karting Reunion

By Kurt Bogerrman
Photos by Natalie Bogerman & Scott Kneisel

Historic class karts coming around the hairpin

On July 29-31, the Genesee Valley Kart Club hosted the VKA for the 2021 Avon 12th Annual Vintage Karting Reunion. 

I really hadn’t paid much attention to the weather reports as the weekend approached. Work had kept me busy, and I had barely cast my eyes on my Karting accoutrement since the previous event a month earlier. My boss was very kind to let me know on Wednesday afternoon that I was “probably going to get rained out.” At least I’ll still have some time off, I thought to myself. Sure enough, as soon as I dropped the selector lever into “Drive” early Thursday morning, the deluge started. Out of the corner of my eye, I could see a wince come across Natalie’s face. She wasn’t sure how I was going to react to this. I said, “What the hell” and proceeded to lug my tiny trailer out of the driveway and disembarked on our 4-hour trek northward.

“On your marks! Get set! … Oh – you’ve gone already…”

This journey was a mixed bag, weatherwise, as we crossed multiple bands of rain, then clear, then rain again, coming down with varying intensity. We encountered some of the heaviest precipitation while we were within a half-hour of our destination, and the sky to the northwest was grim. It was at that point that I began to doubt whether there was going to be an event after all. As we neared the Avon exit, however, the rain subsided, and by the time we arrived at the track, efforts were already underway to squeegee off the track surface. Methods included blowers, dragged gangs of tires, and an amusing new class of entries: “Late-Model SUVs.” I never would have guessed that a GMC could negotiate the hairpin. Things were looking up!

There were a total of 77 entries at this event, and many of them were on site already on Thursday. I’m not sure if my expectations have been skewed by some of the low, Covid-era attendance numbers, but I was struck by the number of early arrivals. I quickly recognized the dayglo tees of Jerry, Marc, and Ben Nagle, who had travelled from NW Ohio and had arrived the night before. I eventually learned that Scott Klingler, Jesse James, Don Renton, and Vinny Rotole had also made pilgrimages from their own Midwestern locales to Central New York.

When the track was finally dry enough to be opened for practice, we took our turns in sessions arranged by basic kart type, i.e., Historic, Rear, and Sidewinder. There was little downtime and plenty of track time. The practice sessions cycled continuously, and this was extended right up to the 6pm noise ordinance cutoff. I’ve said it before: I like Thursday practice days. 

Avon’s banked Monza turn.
Yamaha Limited, Heat one – GO!

Some of us have made it a tradition to get together for a meal on the town if we’re amongst the Thursday crowd. Once the track was closed for the evening, about a dozen of us headed down the road to the popular Italian restaurant, Fratelli’s, for some of their delicious fare. It’s fun to better get to know our karting friends away from the din of the track over good, local food and drink. In hindsight, I consumed too much of that local food and drink. Fried cauliflower chunks, each the size of tennis balls…a portion of chicken parmesan that should have been three meals…so worth it! Or was it? Friday morning came quickly. No time for regrets! Pass the antacids. LOL!

The standard event schedule enumerates morning practice and one heat on Friday afternoon, followed by a more abbreviated practice and two heats on Saturday. Weather forecasts and travel time considerations have prompted us at several recent events to vote on whether we’d prefer to do two heats on Friday and one on Saturday. The modified schedule has become a popular option, and, once again, the majority was in favor of front-loading the schedule.  

Historic class negotiates the Hairpin.

There were 13 classes on the grid schedule, including some combined classes. Historic Rears and Sportsman Rear classes were especially well represented, a growing point of pride in the Northeast. Yamaha participation was strong, of course, with several dual engine entries, as well. A couple of foreign engine duals as well as a couple of four stroke entries were present, too. 

One particularly interesting aspect of this event was the surprising number of Dual Engine Rear machines. There were 8! That’s right – Eight! Our guests from the Midwest were well represented in this category, many of those guys fielding seriously race prepped SAE frames. Several of these thoroughbreds had McCulloch motivation while others featured dual West Bent 820 propulsion. Notably, all eight of these karts finished the first heat, which is a special feat in itself! Their oscillating cacophony of pressure pulses, squealing tires, and general sense of barely controlled chaos produced a palette of sight and sound that was a delight to behold. Even with that kind of excitement on tap, we were able to roll through the first two heats without incident, and upon their completion we segued into the Kart Show and the traditional Avon “Pizza and Pop Party”.

Various rear engine karts on deck.

The Kart Show was very well attended with about 60 karts flanking the Start/Finish line. This doesn’t top our previous Avon record, but it was, I believe, very respectable in this Covid era. I always encourage everybody to participate in the Kart Show and get their machines out there for everyone to appreciate, especially visiting spectators. Natalie, my amazingly supportive wife, helps to distribute the kart show entry forms and People’s Choice ballots, and checks in frequently to be sure that I stay on task. I usually end up serving as one of the Kart Show judges, and I typically seek to enlist two others, one of whom who is confident with Rear Engine stuff, and another who is more familiar with the sidewinders. On this occasion I was assisted by Paul Hunter and Skip Owen.

The challenge of picking any type of “Best” kart never gets easier, and there were so many great karts at Avon! It bears mentioning that two of those Dual Engine Rears posed a particular quandary for this trio of Kart Show judges. Both Vinny Rotole and Brian Santee had exceptional, yet philosophically different entries in the Rear Engine Modified class. Vinny’s was a very beautiful, very customized, strikingly red and black SAE. It featured a gorgeous pair of MC101s on Hegar mounts and beautifully embroidered leather upholstery. It was low and wide, with no shortage of hydraulic stopping power at all four corners. Vinny’s kart evoked images of Ferrari, Maserati, or Alpha Romeo.  Brian Santee’s 1965 Rupp Chaparral, on the other hand, was the analog of a COPO Camaro or something from Carol Shelby’s skunkworks. His machine sports dual MC91s and Hurst/Airheart brakes. Its metallic, piney green paint is complimented by the bright chrome of the steering hoop and the various polished aluminum accessories, as well as by that classic, pleated “Deluxe” Rupp upholstery. Both karts were exquisite in their own ways, but, as judges, we erred on the side of “Period Correctness.” Brian’s Rupp was a restored, factory race team muscle car, while Vinny’s was a retro-mod supercar. At least, that’s my excuse and I continue to struggle with it! The complete show results are published elsewhere in this report.

Kart Show on the straightaway. The judges have their hands full!
“I know! Group photo, everyone!”

Saturday’s schedule was much the same as Friday’s and, again, we were able to complete the third heat without incident. The points were tallied, and the trophies and medals were awarded. Those who had long trips ahead of them got to work packing up their trucks and trailers, while others enjoyed some additional open track time.

Instead of repeating the podium results, which are available elsewhere in this issue, I’d rather acknowledge and thank the people whose efforts made this 12th Annual Vintage Karting Reunion possible. Scott Kneisel and Sam Polito are the promoting team for this VKA event and are the vintage liaisons at GVKC. Scott handles the clerical work, forms, class arrangement, and communication. Sam is responsible for the facility and grounds maintenance (track drying!) as well as safety inspections, and also helped out with flagging, as needed. Don Foley was our flagman, and John Salisbury was the First Turn Marshal.  Darla Frederick, out of sight in the timing tower, kept things rolling like a well-oiled machine. Al Gutberlet, the facility owner and GVKC President was courteous and accommodating, as always. VKA National Events Director, Karl Ginter, supplied the trophies. Maria DeFrancisco handled the 50/50 ticket sales. There are certainly others, unnamed here, who are deserving of our recognition and gratitude: the folks in the snack bar, as one example, come to mind. These events don’t organize and execute themselves. 

This event was fun and exciting. The weather turned out to be exceptional and the turnout approached pre-covid numbers. There was a notable variety of karts on hand, and the competition was clean. It was great to meet new folks from out of the region, just as it was fun to see familiar faces. I’m glad I didn’t pay attention to Wednesday’s weather forecast.

Look at those beautiful clouds….of smoke!
More Yamaha Limited
Dual Rears on the front straight.
Rodrigo’s Sportsman Rear kart, waiting for action.
No one “needs” a trophy… But they sure are pretty!