HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
thmpr77

Has anyone had this carb. gum problem?

7 posts in this topic

I've got an 02 YZ426. I run Turbo Blue race gas and I use the No Toil air filter cleaner & oil. I've been having a problem with the carb. getting this sticky blue gum buildup on it. I tried lightly oiling the air filter and it helped but eventually the gum appears. I talked with the owner of No Toil and he had never heard of the problem. The oil is red and the gas is blue, so I'm thinking there may be a reaction between the two that's causing this blueish gum that gets everywhere inside the carb and causing the bike to run like crap. I'm not over oiling the filter, if fact, I'm probably under oiling it. I always give the oil time to evaporate before starting the engine. My buddy uses the same gas with a different filter cleaner with no problems. I'm just wondering is there anyone else using this combination and having any problems.

Thanks

Share this post


Link to post
Share on other sites

That's race gas for you...I use U4 and found that the carb will gum up much sooner than with pump gas. There seems to be a lot more evaporation going on with the U4 judging from the amount of fumes in my garage. I have to plug the vent hose and drain the carb to prevent getting gassed out of my house...

Share this post


Link to post
Share on other sites

I get a blue-ish type of varnish down the throat of my carb (motor side) and on the slide (motor side). I always thought that it was from when the gas evaporates and left the blue dye behind. That could be totaly wrong.

It has never caused any problems for me, although I do clean my carb often as part of routine maintenance.

Share this post


Link to post
Share on other sites

Wyatt is right. It is the fuel evaporating and leaving the dye behind. Try cutting your race fuel with some premium unleaded or try to buy 103+ unleaded from the pump if you can. It wont have the dye in it.

Unless you plan to tear you carb apart after every weekend, I wouldnt run the race fuel all the time. It is really hard on the rubber seals & orings. The 02 YZ426 runs too damn good on premium pump gas to go through all that trouble. :)

Share this post


Link to post
Share on other sites

Thanks for the input. I've been running this race gas for 2 years and you can tell a huge difference with this compared to premium pump. What makes this problem puzzling is that I've got 2 buddies with 450's using the same gas that have never had a problem. I guess it could be possible that I got a batch with a higher dye content, although I doubt it?? I think I'll follow the advice and try cutting the gas 50/50 and see what that does.

Share this post


Link to post
Share on other sites

I run 1 gallon of race gas to 4 gallons pump just to stabilize the octane, my bike runs more consistent now than it did on straight pump gas. Honda ran a 95 octane in their race 4 strokes last year and that is what it averages out for my mix and I don't get any of the gum stuff like I have in the past with straight race fuel.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0