Going to 2 cycle

[TJ Koyen]

Just as a second opinion, we also slipped around 10k on the clutch for pipe as well. We're talking old school Yamaha pipe here, not the new KPV pipes or whatever they're running on them nowadays.
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T.J. Koyen
OKTANE VISUAL - Custom Helmet Paint & Graphic Design
www.oktanevisual.com
www.facebook.com/oktanevisual
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DB Motorsports
Exprit/Leopard

[Sean Kisselbach]

We use the new style pipe. Mabey that is the difference?

[Brian Mead]

I'm sure it is. The original poster referenced the L2, which is what I have.
I'd still play with the slip to see if you can get better times. Better yet, show up with an L2, slip it to 10.2 and see the difference.

[Michael Knauf]

Builder told me over 10K for the L2 pipe, around 8600 for the can.

I'll of course play around on the tracks I am going to run as see what is best for me. At least those seem like good ballpark #'s
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Mike

[Ken Olson]

If you are needing lower than normal sprint racing gear ratio's, because your track is tighter/smaller.. look into a 20mm belt primary jackshaft setup.. be worth your time, and will cover you on any track you go to.. gear changes made simple.. will be able to use ratio's from 17:1 all the way down to 4.5:1 depending on the gears you use on the rear and jackshaft.. Kent @ Laukaitis sells them also for about 270.00..
You'll need an engine belt driver and a motorplate(bolts up to the Yamaha base and has a couple of studs sticking out the bottom on 3" centers to slide in the jackshaft base so you can adjust belt tension)

With a 21 tooth engine belt driver, the belt primay ratio is 2.71(57/21) so you just multiply the rear gear set times the primary ratio to get the final gearing.. and any of the 4 stroke 3/4" bore clutches will work well.. by going with the belt reduction.. it slows the clutch down to the normal operating speed of a 4 stroke, while your engine is turning 10,200 when it engages.. 2 disc or 3 disc dry clutches are cheap anymore.. heck, a little 2 disc MDC clutch would do the trick on a pipe Yamaha..

21/57 belt x 15/75 rear is 13.55:1(small enough gear, 75 tooth so it doesn't hit the ground)
21/57 belt x 24/53 equals 5.98:1(you can find gears up into the 20's just about anywhere for a 3/4" bore/#35 pitch clutch.. nice thing about it.. when you are ready to step up to a case inducted reed engine like a TT-75 or Parilla Reedjet for more power.. you can just bolt it up..


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Ken Olson
Pacific NW Tire Services
Major Racing's "Roll N Prep"
BRC Engineering 150RR

[ted tucholski]

Sean, you are using an RLV 3 pipe used to replace the old can. These guys are reffering to tuned pipes. 3 or 4 HP difference and they slip'em 9600rpm to 10800 in some cases. Send me a pm on PKRA's website

[John Cleveland]

Mike, Avon is a great track. Didn't run there last year was running dirt but ran a pipe there a handful of years ago. Had an A2 with a L&T 3 disc, slipped to about 10,200. I cant remember off the top of my head but I ran either a 10 tooth drum and 80 or 82 sprocket ( notebook is on trailer) I'll have to look when i get a chance. If you can get it I always ran VP leaded ( felt it helped lubricate and cushion the ring a little extra) 110 with red line synthetic and never had an issue. Cant go wrong with Laukaitis either. I have won two WKA divisional championships in 4hole can running his stuff, great motors and advice.
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"Commitment isn't the time you spend its a line you cross"

[Michael Pine]

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Mike
sales@kartpartsdepot.com

www.kartpartsdepot.com

[John Matthews]

[Max Wood]