Carb issue or something else? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 2 (permalink) Old 04-27-2011, 05:42 PM Thread Starter
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Carb issue or something else?

I just finished rebuilding the engine since I have replaced the balancer dampers. As part of the rebuild I cleaned both carbs but when I finished the rebuild and started the engine several things happened.
Uneven idle: Getting better with time but some hard stating cold.
Low power: Seems to accelerate good but when starting from dead stop the engine has low power
Rear exhaust pipe not warming up at the same rate of the front cylinder exhaust pipe.
I have already check that there is spark to the rear cylinder...

Any suggestions?


93 VN750
R/R Relocation to the front
Pirelli MT66 Tires soon to be mounted (only after 14 years...)
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post #2 of 2 (permalink) Old 04-27-2011, 06:43 PM
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I am presuming your bike is mostly stock. Your descriptions do lead me to believe it is a carburation issue. I suppose you have done the following:

1. verified good compression on both cylinders.
2. verified steady ignition timing (all plug wires).
3. verified both carb fuel bowl float levels.
4. verified good idle carb syncronization.
5. verified all hose connections to the carbs (nice and tight)
6. checked for vacuum and carb boot leaks with WD40 or water.
7. verified mixture screws set to initial 2.5 turns.

If all this has been checked, there may still be some obstruction to the pilot jet or pilot carb body passage in one of the carbs.

One last thought, you might try gently running the mixture screws in until they seat, and then run them back out 2.5 turns. Sometimes that will crush some junk out of the needle seat.

That's all I can think of. Maybe someone else will chime in soon.

Good hunting ...

~~C8> Ratt
'91 VN750 - Cosmic Splendor/Candy Wine
Done: Coastered, .020 ign., Iridiums, VM
Plexistar II, MCCT's, Relocated MOSFET
Next: LED's
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