thebluebus

As the subject suggests my fuel mixture screw seems to be undoing by it's self. I noticed this when the car started to bog down and i coulnt see why.....then i noticed the screw had almost undone completely!!

Its on a TTR pro 21 engine on my EB4

Is there a way of tightening this screw somehow?

BUGGIES_R_US

Wow thats a new one.

I dont know if this is a good idea but maybe you could use some loctite on it?

Every time you change the setting you'll have to "break" it but its a sure way to hold it in place!

ram

dbow

My Feedback: (1)

Are you talking about the high end needle or the low end?
The housing maybe?

ummm, sounds like the O-ring needs to be replaced or you have it screwed out to far.
Look at your engines manual and set the needles accordingly, if it is still loose, inspect the o-ring and replace if needed.
Check the needle housing also, could be out of round and need replacement. If its the houseing that is coming out of the carb, you just need to tighten it.
Could be any number of things, you will have to troubleshoot. Whatever it is do not run the car that way because the engine can not maintain correct fuel flow with loose needles.


My best suggestion is to take it to the hobbyshop.

Dbow

nitroman88

My Feedback: (5)

dont put loctite in it. If any of that loctite were to get sucked into the engine it could cause some issues aswell as clog up the carb.

KyleSch

If its the high speed needle just get a new one its like 5 dolllars. If its the low speed you have some problems because thats connected to the inner part of the carb.