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 Post subject: SR-Y Pipe installation problem. Solved & Completed.
Unread postPosted: Wed Feb 13, 2019 12:29 pm 
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Posts: 20
So... I acquired a new kart this winter. It's a later Yamaha RC100 that has its original KT100 engine. The engine is mounted conventionally, with the exhaust out the back, not like the early model with the exhaust port aimed frontward.

I intend to get some seat time in the kart this season, my thought being that starting out at the back of the pack in Yamaha Limited would be the best place to start, rather than jumping head first into Stock Appearing. I decided that, instead of asking to run a non-compliant exhaust, that I'd install the SR-Y pipe and see how I fare. (I purchased the kart with a sporty 3-hole can installed, and a straight, tuned pipe and a curved manifold included.)

However.... I am having some issues sorting out the geometry of the 60/30 SR-Y pipe. I purchased a used Odenthal mount in order to have the required 3rd bearing support, and I purchased the SR-Y pipe and VKA-9111 header from RLV. Now, however, the manifold interferes with the seat strut, and the angles of the cylinder and pipe, combined with the long, 12" spec'd flex length, cause the pipe to interfere with the rear bumper, with the engine mounted as far forward as the other strut and nerf bar allow. Does anyone have any pics or suggestions that might help me sort this out?

Thanks,

Kurt


Last edited by Kurt Bogerman on Sun Mar 17, 2019 6:48 pm, edited 1 time in total.

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 Post subject: Re: SR-Y Pipe installation???
Unread postPosted: Fri Feb 15, 2019 1:23 am 
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Joined: Wed Nov 11, 2009 1:45 am
Posts: 26
If I read your post right your running 12 in. of flex. you should be running 12 in. total piston to first cone of pipe. Put flex in header and check end of flex to piston if its over 12 in. cut flex off .


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 Post subject: Re: SR-Y Pipe installation???
Unread postPosted: Fri Feb 15, 2019 4:30 pm 
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Thank you, James.

While this is my first Yamaha kart engine, I do understand your suggestion. The "flex" is actually approximately 4.5" long, per the procedure described in Lynn Haddock's FirstTurn tech article. I think the real issue is that I need either a header that angles upward, a mount that tilts the engine further forward, or both. The header is the RLV VKA-9111. The mount that I purchased is an Odenthal, part # OD-YAM30. The mount, though beautiful, only angles the engine about 5°, nowhere near the 13-15° that, I've read, is the"optimal" angle for cooling turbulence. In this case, another 10° of angle might be useful for mounting the pipe, too. You can see in my photos that the current setup would require the removal or radical modification of the bumper, which is a solution that is not on the table.

Any other ideas? Any recommendations for an angled header and/or a plate to angle the engine a little bit more?

Thanks, all!

Attachment:
File comment: Pipe doesn't fit, even with engine all the way forward.
IMG_20190215_160333_crop_502x393.jpg
IMG_20190215_160333_crop_502x393.jpg [ 160.48 KiB | Viewed 1538 times ]


Attachment:
File comment: Pic from a different perspective, showing interference with bumper.
IMG_20190215_160355_crop_502x393.jpg
IMG_20190215_160355_crop_502x393.jpg [ 160.1 KiB | Viewed 1538 times ]


Attachment:
File comment: Odenthal Yamaha mount (pic from Odenthal website)
odent3rd_crop_502x400.jpg
odent3rd_crop_502x400.jpg [ 93.9 KiB | Viewed 1538 times ]


Attachment:
File comment: The mount is as far forward as possible, finding interference with the both the forward seat strut and nerf bar.
PhotoPictureResizer_190215_161805435_crop_502x393.jpg
PhotoPictureResizer_190215_161805435_crop_502x393.jpg [ 174.89 KiB | Viewed 1538 times ]


Attachment:
File comment: Measurements described in Lynn Haddock's RLV pipe article.
PhotoPictureResizer_190215_163602851-502x376.jpg
PhotoPictureResizer_190215_163602851-502x376.jpg [ 54.01 KiB | Viewed 1538 times ]


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 Post subject: Re: SR-Y Pipe installation???
Unread postPosted: Fri Feb 15, 2019 8:56 pm 
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Joined: Sun Mar 04, 2007 12:39 pm
Posts: 18
Kurt - If your header is angled, turn it over so it exits the engine up instead of down. Also you can always cut your connector and reweld to any angle that helps fit the pipe up.

I have done both in the past and it works pretty well.

Larry B.


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 Post subject: Re: SR-Y Pipe installation???
Unread postPosted: Fri Feb 15, 2019 9:36 pm 
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Joined: Wed Nov 11, 2009 1:45 am
Posts: 26
Kurt I think Larry hit the nail on the head. it look like just flip the header over. good luck.


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 Post subject: Re: SR-Y Pipe installation???
Unread postPosted: Fri Feb 15, 2019 11:48 pm 
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Thanks, guys. The header I have, the VKA-9111, is a straight header, so it sounds like I need to find an angled one. The only angled, parallel-wall header I have identified is the 12° RLV-9110. If anyone knows of another option, please let me know.


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 Post subject: Re: SR-Y Pipe installation???
Unread postPosted: Tue Mar 05, 2019 9:43 pm 
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I finally ordered up and received a VKA-9110 header from RLV. This did the trick. I didn't expect it to move the pipe high enough, but, sure enough, the pipe now clears the seat brace and the rear bumper, through the full range of adjustment. It's coming together now with this solved and some of the smaller parts like exhaust springs and clutch shims arriving with the mail.

Thanks for the advice.

Kurt


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 Post subject: Re: SR-Y Pipe installation???
Unread postPosted: Sun Mar 17, 2019 6:47 pm 
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I'm getting pretty excited to burn some gas!


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