My daughters each have a 2005 trx90. The last time they were rode was about 8 months ago, and since then they have set in our garge. I went to start them yesterday and couldnt get them to idle without the choke on. So I pulled the carbs and cleaned them concentrating on the low speed jets. Put them back together, adjusted the air/fuel screw, and set the idle. They were purring like kittens and I thought everything was good. But when they started riding I noticed each had a problem. The first one runs great at low speeds but cuts out when you get into the throttle when in gear. The second runs great when in gear, but when in neutral if u punch the throttle it bogs and may even cut off. Since both of these were running perfectly before they setup, I figure it has to be carb related. Any ideas?
Thanks,
Randall

 

First, have you serviced the airfilters? After a while, the oil will tend to dry out and become ineffective. 8 months is a long time. Just for giggles, I would throw new plugs in them and change the oil as well. You were right to clean out the carbs, those small jets and passages gum up easily. You might need to do that again. Make sure the intakes are connected up perfectly as well.

 

bump

 

We get these posts all the time...where a quad sits for a long while and the jets get gummed up from the evaporating fuel. Been there and done that, and when this happens to us we have nobody to blame but ourselves!

This carb is particularly suceptible to running poorly with a clogged idle jet! Jets are cheap, so don't try to clean them, just go get some new ones.

And remember, when you do get it running, what do you have in your fuel tank...stale old gas!

 

So do u think this could be caused by the low speed jet still being clogged? Or should I replace both with new? I think those are the only two in this carb is that correct. I already drained the tank and put new fuel in it. My local dealer doesnt stck these jets or I would have replaced them to begin with and I was trying to get out this weekend.
Thanks

 

Is this a pumper carb. If so, make sure the accelerator pump is working.

 

This is a low end carb, so no pumper.

Folks imagine that they have cleaned their jets by spraying some solvent through them. That will probably do for a main jet, but most of the time doesn't do it for the idle jet.

 

I have found that one strand from a wire brush hold on to it with a pair of vise grips and run it through the jets will clean them right up you should not have to buy new ones that is a crock of S&!+.

 

I wouldn't buy new pilot jets either, you should be able to get something through there to clean them out if that is the problem.

 

not sure what the tech name is for it but, where the main jet screws in there is a long rod that the metering rod slides up and down in. It has several small holes in it. This needs to be pulled out. The top of the carb needs to be taken off and the slide and metering rod pulled out, then the main jet needs to be removed. you should then be able to pull the piece i am talking about from the top-side of the carb. I assume the carb is made like the 98 yamaha kodak I just rebuilt for a friend. His had the same symtoms and that was the cause.