acp problem

1 reply to this topic
  • chepy

Posted January 11, 2002 - 05:00 PM


The last time I did this I typed for two
hours,and then lost the letter,Im a maroon..
Im having that hesitation problem with my new?,
98 400f?....totally stock. I can kill the motor
just by cracking the throttle too fast.....

Im interested in the kh/jd acp mod, but first
I gotta get it to work. The check valve in the
float bowl wont let gas through, Ive blown it out
repeatedly. It allows pressured air through, but
not gas. ( I got it to work once) It would kinda
drip out..but now nothing..does it get sucked -
through? by the diaprahm? its not serviceable is
it ? should I buy a new bowl ? It was very incon-
siestant when it did work. It would hit the the
needle-journal, not the slide. when I put a spacer on the diapram ( to limit stroke) it didnt.
but still, very inconsiestant.
Can you recommend jet sizes, needle,etc..
I ride at 4000 ft and above.

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  • F-Pilot

Posted January 11, 2002 - 05:14 PM


Yes there is a check valve in the fill passage to the pump and the diaphram sucks the gas in. I don't think it's servicable but if you have fuel in the pump bowl it's flowing.
The squirt passage can also get clogged. I had to clean mine with spray carb cleaner and compresed air. It took alot of times but finally cleared out.
I would try buying a new diaphram and o-rings first. Also make sure your pump actuation rod moves freely. '98 and '99's had a problem with dirt and corosion there.
If you get it working run a fuel filter, the passages are so tiny = easy to clog.

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