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Author Topic: Racing fuel questions  (Read 2737 times)

Offline chrisr

Racing fuel questions
« on: September 05, 2013, 10:56:38 AM »
Decided I'm going to make the switch to straight 110 octane race fuel.  I had been using 108 octane "pump race fuel".   I want to get away from using anything from the pump and start buying the 5gal cans most fuel companies offer. I'm looking for a little guidance as to what fuel I need to use......oxygenated or non-oxygenated?  Also looking for a baseline to start jetting from.  The engine has no port work, a cool head using a 20cc dome, Boyesen power reeds, stock 34mm Keihin carb and FMF pipe.  I'm in South Carolina with a elevation of 136ft above sea level.  I'm new to the Keihin carbs and their jetting numbers and looking for a starting point.
Let the good times roll............

Offline C-Leigh Racing

Racing fuel questions
« Reply #1 on: September 06, 2013, 10:10:21 AM »
Do not use oxygenated fuel for several reasons. To many problems & even as much time to explain the reasons.

The main thing to think about on the gas used, how high the engine is building compression to & what jet sizes you'll need to keep that piston cool.
List the engines compression when cold & then when hot.
Neil
C-Leigh Racing, in memory of Caraleigh Pritchard
Race team for 2015
Chuckie Creech #25 TRX450R, Pro, Pro Am, Pro Am Unlimited
Andrea Creech # 25 TRX450R, Womens (National ATVA EDT)
Andrea Creech #33 TRX350R, Womens (local EDT)

If it aint got a hot weed eater 2 stroke engine, all its good for is a pit bike

 

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