Methanol convetion

[damo77153]

Hey i was wondering if there is anyone who would no what would be involved in converting my keihan carby to run on methanol its for a cr500.I no the jets have to be huge and the carb has to be bored out to acomadate the masive amonts of fuel but i just need to no how i go about doing it.I use my bike for drag racing so iam realy keen to seting it up for meth but i just dont no where to start any help would be great.

[ossagp1]

I am not sure what you mean by boring your carburetor to allow for the "massive" amount of fuel. Yes you will have to run way larger jets. Start at about twice the flow rate your bike now requires. Buy extra pistons. You will need to run a much higher compression ratio if you wish to achieve a power increase.

What you will have to enlarge is the fuel delivery to the carburetor itself.

I have done it on 4 strokes, and two strokes. Just don't ask me if it was worth it.

Your fuel tap can be replaced by one from Pingel that will probably suffice for your needs. You will need a larger aperature in the float seat as well.

if you are going to stick with a Keihin, PM me and I will give you some more suggestions.

[damo77153]

Im not sure what boreing out the carby would mean thats what i was told by the guy at my local bike shop.Is it easyer to use a mikuni becouse i heard that all you have to do is have lager fuel lines and a power jet kit with this carb.If it is easyer i would be more than happy to buy one as i want one carby for methanol and one for standard fuel.

[ossagp1]

I think the easiest one to use is one called "Lectron". They also seem to work better than the rest when the engine isnt quite warm enough, like drag racers many times are not.

The Mikuni is the easier of the two you mention. Now, of all this advice you are getting, how much of it is coming from people who actually DID a conversion to methanol? Then you may want to track their results, rather than just determine that they got one to 'light' on "alcy".

Again, if all you do is change the type of fuel you are using, don't expect much.

[damo77153]

I'm going to up the compression and i am also using a custom made down pipe as well as getting some port work done.We have this race hear called the king of the beach its where we race speedway stile but on a beach they even use street bikes but the 500s relay kick ars.The guy i got some info from has won this race seven years in a row his 500 runs on methanol but he wont tell me much because he docent wont to give away any secrets.
I was looking at this thing on the web last night its called Dial-a-Jet its like a power jet but works way better it can be fitted to any carb if you want to check it out its at [Only registered and activated users can see links. ] do you think something like that will work.I no that other modifications have to be made and i no that is all trial and era.

[ossagp1]

I am familiar with it. The first thing about any of the adjusters (I use a different type on snowmachines, Holtman Engineering makes it) is that you have to have jets large enough to be adjusted far enough. Like you say though, it is a lot of trial and error. I have a CR500 too. Last count I had three different cylinders for it. If I were doing your conversion I would start with twice the fuel delivery you have now as far as jetting goes. Someone at SUDCO.com may have some suggestions. Moose Racing had some people that played with alcohol on big two strokes as well. Just be willing to spend some time and money. That race sounds like a lot of fun.

I would look at having about 240 lbs of compression off the kick start as a starting point. Get an oil that is happy with alcohol. Klotz has some castor based stuff that is. Not everything works with it.

[Pretendo]

What do you think about trying it with an RM-125 ? ^_^

[ossagp1]

on the 125 you will need some headwork. do you know rick peterson?

[Pretendo]

I am aware of him, yet I have the tools to do head machining myself, and other mods I'll need to do. I just need to know in general all the things that need to get modified. and when all this is done, is it really better to run this as apposed to regular fuel? if you could tell me, id like to know how the change in reliability would be as in parts changes. and also if its going to be so extensive, to the point that I could not just have a methanol head and cylinder and change out when I please. I try to give extensive awnsers, and this subject really intriges me... I am very very intrested. I would like to know all you know about this methenol idea. if you know everything required i might even pay a little bit for this knowledge. Im a 200 pound rider on a high horsepower, high RPM motor. im constantly pinned the whole time pretty much. My motor is as far as stock as one can get, and i run through a good ammount of parts as it is. i run Castrol oil, either the cheap green label Blendz-all or the $27 a quart Castrol A747. I need more power, and if this is the ticket... sign me up. if you could tell me how frequently I have to do tear downs or what parts are gonig to need changing the most. i need all the inf ou've got and i will pay for your time, but im a cheapskate and kinda poor. :P