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Old 08-03-2009, 03:22 PM   #2 (permalink)
jrcirondog
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Join Date: Jun 2009
Location: Boise
Posts: 42
Re: 1974 Z50 Carb Question

Not sure how you cleaned the carb, but from my experiences here is what I recommend. Get a caustic carburetor cleaner (like Barrymans or Gunk) usually it comes in a gallon sized paint jug. Remove everything from the carb ESPECIALLY ANY GASKETS or ORING (if you miss an o-ring and place it in the cleaner it will swell up and be ruined). Place all individual metal carb parts in the metal bin inside the caustic carb cleaner and soak overnight. Next day get a pipe cleaners (or a needle from a sewing kit) and put it through all of the jets and passage ways you can. Make sure you put the needle or pipe cleaner through the idle and pilot screw (air screw) passage ways. Then take compressed air and blow all of the passage ways out. Re-assemble and see if there is a change. Where exactly is your carb leaking? If its leaking around the bowl drain screw can easily be fixed, but if its leaking around the gasket between the bowl and the main carb body then you might need a new gasket (or rebuild kit). Needle and seat could be another possiblility as well.

The very last thing I would do is up the pilot jet size, but I would use that as a last resort, because I am assuming that bike ran well with the jets it has in it presently. 90% of carb problems I have seen are resolved by Thorough cleaning.
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