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21 Apr 2008
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New on the HUBB
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Join Date: Jun 2007
Location: Melbourne, Australia
Posts: 5
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Carb sync symptoms?
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
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21 Apr 2008
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Registered Users
Veteran HUBBer
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Join Date: Jan 2001
Location: Stockholm
Posts: 651
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Not easy
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
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21 Apr 2008
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Join Date: Jun 2007
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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
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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
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22 Apr 2008
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Join Date: Jun 2007
Location: Melbourne, Australia
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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
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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
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