R460/Staton spiting fuel

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kerf

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I posted this in the two stroke forum, silly me. With 3750 clutch springs and 18.75:1 final gearing, I can load the engine easily. Going WOT under heavy load causes a pulse back through the carb, spiting fuel into the air filter. The carb is good, exhaust port & muffler are clean and the compression is good. The bike runs great except for this problem. Has anyone run into this before.
 
carb

I dont have the prob u describe, but I did away with the primer bulb line on both 460s, is yours hooked up? Just trying to help figure it out. Craig...
 
Primer bulb is good. With the high ratio I'm running and the 3750 clutch springs, I can really load it at low speed. I think the air cleaner problem was caused by going WOT at 10-12 mph, that's when I get the spray of gas out of the carb. I was holding the brake yesterday, blipped the throttle, while holding my hand behind the carb and got sprayed. The solution, I think, is to moderate the throttle until she reaches 5k, then let it eat. Might want to check yours.
 
oil

my filters look like new inside no oil. my primer is not hooked up.I was thinking maybe you tank is building pressure and pushing fuel threw the primer hose. Just a thought. block it off and try it. Craig...
 
Found my problem, it's the Staton gear box. The R460 has very aggressive intake port timing, directed toward top end performance (7k & up). Thanks to my 3750 rpm clutch springs, tall gearing and Staton's bullet proof gear box, I've been going WOT from the start. Result, loading up at low RPM, blowing fuel into the air filter. I have to be easy on the throttle under 25, from then on - zoom, zoom, zoom. I can hit a hill at 25 and be peddling at the top, or hit it at 30 and be going 35 at the top. Looks like I do have a two speed, fast or faster.:???:
 
Morning campers,
Armed with my new found knowledge and a clean air filter, I pulled out at 5:30 this morning on a 17.7 mile test run. Great ride, pulled some "bad" hills on the way. Stopped to watch a train (8 locomotives) and had a cup of coffee, checked plug color, it was good, rolled on home. Completely ignored by local PD's again. The bike used 520cc of fuel, breaks down to over 128 mpg.

Kerf be happy!:D
 

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