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 Re-Building your Yamaha Carb 
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Joined: Sat Feb 28, 2009 9:44 pm
Posts: 390
Location: Hilliard, Ohio
Class: Tag Senior
Chassis: Kosmic T-11
Engine: Comet Parilla Leopard
Post Re-Building your Yamaha Carb
When we ran Yamaha, I found that most engine builders (at our altitude) set fulcrum arm height at .045" (no gasket) and pop off at 10 psi. (This is for the big Carb) Most (and I) do not recommend you "cut" spring coils to reduce pop off, as this will reduce the "spring rate". It's better to squish the spring between your fingers or get a different spring. I own this kit from EC Carbs.

https://eccarburetors.com/webstore/carburetors/tillotson-carburetors/hl-tillotson-carburetors-and-parts/hl-334a-ab-aa-carb-parts.html

Carb re-build kit (Complete if you need new needle, only if your carb will not hold pressure when doing 1st pump w pop off guage)

http://www.cometkartsales.com/store/carbs/walbroya.htm

How often do you re-build your carb :?: How bad do you want to win :?: The FAST guys do it every race day ;)

This is not rocket science and is easy to do.

http://www.madscientist1.com/rebuild_walbro/rebuild.html

You need 0-15 psi pop off guage available here.

http://www.cometkartsales.com/store/gauges/dial.htm

And Walbro Fulcrum Arm Guage located on the "Tools"- 2-cycle engines page (scroll down almost to bottom)

http://www.cometkartsales.com/store/tools/2cycle.htm

_________________
Greg C. Wilkinson
Driver- Angel Wilkinson
"Tag" Team Wilkinson
Kosmic/Comet Leopard
greg-wilkinson@sbcglobal.net
614-535-6977


Sun Jul 21, 2013 9:37 am
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 Re-Building your Yamaha Carb 
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Joined: Sat Feb 28, 2009 11:19 pm
Posts: 539
Location: Columbus, Ohio
Class: Jr. Clone
Chassis: Bandit
Engine: 4 cycle Clone
Post Re: Re-Building your Yamaha Carb
Different tracks take different pop off settings. You are fine at 10 PO at CRP, but Mid-Ohio, Jacksonville, Road America, or any track with a long straight or a hard pull, will need to be lowered. Long straightaways take a lot of fuel. I tuned for some racers at the Canadian Grand Nationals at Mossport Park, and the engine builder(not me) wouldn't change the PO from 10 and welded up 4 motors before he listened to me to lower it to 6 PO. Also, PO depends on what pipe you are running.
Getting the most power from a Yamaha is carb tuning. You mostly have to be on the edge to be fast,

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"It's not in my nature to spend money sparingly when I'm having a good time"


Sun Jul 21, 2013 10:21 am
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 Re-Building your Yamaha Carb 
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Joined: Sat Feb 28, 2009 9:44 pm
Posts: 390
Location: Hilliard, Ohio
Class: Tag Senior
Chassis: Kosmic T-11
Engine: Comet Parilla Leopard
Post Re: Re-Building your Yamaha Carb
Butch,
Yes, I should have said this is for a "Can" engine on sprint tracks at our altitude ;)

_________________
Greg C. Wilkinson
Driver- Angel Wilkinson
"Tag" Team Wilkinson
Kosmic/Comet Leopard
greg-wilkinson@sbcglobal.net
614-535-6977


Sun Jul 21, 2013 10:39 am
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