129 MAX Speed

[Rob Ach]

Tomorrow is the annual neighborhood tractor race [all stock - I think] and was curious if there is anything easy that could be done to eek a little more speed out of the old 129. Granted the max speed of the tractor is controlled by the hydrostatic trans and maybe this is more so psychological, but was looking for any edge I could find. [the one neighbor has a big ol' JD] I've seen posts to remove the sponge around the air cleaner and have since put some additional air in the tires and removed the deck, hanger and wheel weights. Was considering buying higher octane gas but thought I would throw it out to the experts here. Any suggestions, ideas, ro comments would be greatly appreciated.

thanks in advance
Rob

[Jeff in Pa]

The tallest tires you have will increase speed.

have fun

[J-Mech]

Speed up the engine to 3800RPM

[Sievert456]

I had 26x12x12 ag tires on my 147 for a tractor pull and they made it a little faster then the stock 23x10.50x12.

[prlwpod]

should make a worthwhile improvement in the way the motor runs (Higher Octane = better combustion ). You can usually buy Av gas (Aviation Fuel ) at the airport or Racing gas from a station that carries the premium stuff. Google is your friend. Good Luck.

[cubs-n-bxrs]

Originally Posted by prlwpod

should make a worthwhile improvement in the way the motor runs (Higher Octane = better combustion ). You can usually buy Av gas (Aviation Fuel ) at the airport or Racing gas from a station that carries the premium stuff. Google is your friend. Good Luck.

You can basically run any grade gas you want it's not gonna change engine RPM's . Gov is set at 3600 RPM's and that's all there is. You can change Gov settings but I wouldn't go more than 2 or 3 hundred RPM.

[Sam Mac]

Originally Posted by prlwpod

should make a worthwhile improvement in the way the motor runs (Higher Octane = better combustion ). You can usually buy Av gas (Aviation Fuel ) at the airport or Racing gas from a station that carries the premium stuff. Google is your friend. Good Luck.

Sorry, but I have to disagree with this. Higher Octane in a low compression engine like you have in a Cub will actually give you less power. High Octane is used to control detonation in high compression engines.

[Mike McKown]

Originally Posted by cubs-n-bxrs

You can basically run any grade gas you want it's not gonna change engine RPM's . Gov is set at 3600 RPM's and that's all there is.

As far as engine mods like air cleaner, gasoline, timing, etc., short of adjusting the governor, that is the bottom line.

Bigger rear tires (gearing) would be the safest, easiest change short of adjusting the governor.

If you're running around any sharp corners, I just wonder if leaving the deck on the tractor wouldn't be a good idea to lower the CG? If you're on dirt, wouldn't skinny front tires dig in a little better in the turns vs using wide ribbed tires?

Just guessing here. I never raced a lawnmower.

[DoubleO7]

LOL, you should have looked into this like two weeks ago, not at 9pm the night before needed.
Just get on it and stay low.

[Mike McKown]

Originally Posted by DoubleO7

LOL, you should have looked into this like two weeks ago, not at 9pm the night before needed.
Just get on it and stay low.