A buddie of mine has a 400ex and is thinking of putting it on alcohol/methanol. Have any of you done this with stock carbs? If so can you give us a good starting point for jetting? I know alcohol is pretty forgiving and I have several other friends who are currently running it but none on a 400ex. I also know that it takes alot more alcohol than gas. If anyone has experience with this your help would be greatly appreciated. He's got a pretty basic setup with opeaned airbox, K&N, full exhaust system, and basically a stock motor. I don't know about the ex but another friend had a ds with a stock motor on alcohol and it ran very well. Thanks in advance.

 

Thanks for all the replies. I guess he'll just keep getting spanked by a ute since ya'll apparently don't know how to make the ex faster.

 

Asked a buddy of mine that used to run the 100mph go carts on meth. He said start by jetting it Double. ( thats size wise..not jet#)




found this if it helps.

If the stoiciometric mixture ratio decreases, larger jets are required and vice versa. Any such changes should,.of course, be made on a percentage basis ie. when the stoiciometric ratio in creases by a certain percentage, the jet sizes should be reduced by that percentage.
For example, if commercial petrol (stoiciometric ratio 14.5) is replaced by methyl alcohol (methanol, with chemical formula CH3OH - stoiciometric ratio 6.5) the jet sizes should be increased by about 50 % ie. double the flow rate. If fuel consisting of 25% petrol and 75% methanol is used, jet sizes should all be increased by 30 % with fuel composed of 50 % petrol and 50 % methanol, the jet sizes need only be increased by 18% compared to when using straight petrol.
You should also replace the needlevalves, increasing the seat sizes accordingly.
When using special fuels such as methanol, it is very important that all the component materials of the Carburetor s have been treated, wherever necessary, to resist chemical attack. For example, nylon components should be removed, and replaced by other parts resistant to the new fuel.

 

Here is some good reading....http://www.ctracing.com/alcohol.htm

 

Thank you for replying. That is some good reading thanks for sending it. I know about alcohol and it's good and bad points. I was mainly wanting to know how the ex carbs handled it and if there were any significant gains by using it in a stock 400ex. As I said before a friend used to run it in his stock motor DS that was pretty low compression about 8.8:1 I think and he had good results. But like I said that's a DS and a TM45 carb. not a stock ex carb. If anyone else has more info or has a ex on alcohol please feel free to respond. All help is appreciated.