Carb sync symptoms?

**TTR600_marc** · #1 21 Apr 2008

I've had the carbs on my '98 TTR600 taken out and cleaned. Now at around 1/4 throttle (at slow engine revs pulling a high gear) the engine 'hunts' a little. It is responsive when the throttle is snapped open and runs great at higher revs with more open throttle. I was wondering if the secondary carb could be set to open a little too early, causing lean mix (not enough vacuum to lift the slide but butterfly still letting in air). I am confident the carbs are clean and needles and jets were not adjusted.

Any ideas?

Marc

**aukeboss** · #2 21 Apr 2008

to diagnose these things, but I seem to remeber something comparable with my TTR 2002 - to be solved by setting the idle mix correctly (if smbd cleaned your carb and did not remove the idle mix screw, he did not do a good job).
Screw at standard setting - heat up engine - turn out till revs increase, keep turning out till they decrease - screw in 1/2 a turn - leave it. Re-adjust idle speed.

Auke

**TTR600_marc** · #3 21 Apr 2008

Quote:

Originally Posted by aukeboss

Screw at standard setting - heat up engine - turn out till revs increase, keep turning out till they decrease - screw in 1/2 a turn - leave it. Re-adjust idle speed.

Auke

Thanks, I'll try the idle jet screw first (best to start with the easiest things!). It is set it at standard 3 1/2 turns out now but I think it was something like 4 turns out before dismantling.
Marc

**TTR600_marc** · #4 22 Apr 2008

Quote:

Originally Posted by aukeboss

I seem to remeber something comparable with my TTR 2002 - to be solved by setting the idle mix correctly Auke

I tried idle mix adjustment but no change to the symptoms.

Since it runs fine at higher speeds I assume it is unlikely to be a rubber boot problem - is that correct? Any other ideas?
Marc