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Too rich
- KzRyan
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- Ryan
1978 Kz1000 A2A. 1040 Weisco 10.25:1 pistons, VM 28ss carbs, Dyna S Ignition and coils, Moto GP Werks exhaust, Ikon Shocks, lithium ion battery, Always a work in progress.
1974 Kz400 - 16K miles - all stock
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- SWest
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- 10 22 2014
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Steve
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- DaytonaKZ
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- DaytonaKZ
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...I wish I was too RICH!DaytonaKZ wrote: I am the :evil: working on the 29's... all valve clearances are at >005... Just like I like them. Going to check choke system next see if there isn't something there causing the rich ness... Maybe order some 15 pilots ???I :evil: :evil: :evil: :evil:
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- SWest
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Steve
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- KzRyan
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1978 Kz1000 A2A. 1040 Weisco 10.25:1 pistons, VM 28ss carbs, Dyna S Ignition and coils, Moto GP Werks exhaust, Ikon Shocks, lithium ion battery, Always a work in progress.
1974 Kz400 - 16K miles - all stock
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- SWest
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jetsrus.com/carburetor/carb_mikuni_VM29_...oded_view_parts.html
I would suggest if you can afford it, go with what is called for in the application chart on that page. Even then remember these are "race carbs" and may not behave like the stock ones that came with the bike.
Steve
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- KzRyan
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Motor has 1015 weisco pistions and Z1 cams. Otherwise stock yes.
1978 Kz1000 A2A. 1040 Weisco 10.25:1 pistons, VM 28ss carbs, Dyna S Ignition and coils, Moto GP Werks exhaust, Ikon Shocks, lithium ion battery, Always a work in progress.
1974 Kz400 - 16K miles - all stock
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- DaytonaKZ
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- DaytonaKZ
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- SWest
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My 33's call for much smaller pilots with 1.5 cutaways. I have 2.0 so I'm running 70's and 130 mains. It runs good but it could be better with the right slides and jets.
Steve
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- Patton
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KzRyan wrote: . . . 29 smoothies . . . Kz1000 . . . Bike runs but is rich. . . The bike will run without the air jets in it. We can back them all the way out and it's the same. 117.5 mains are in it. . . .
When turning the pilot air screw has no effect at low idle rpm, it may indicate an imperfect pilot circuit. Would suspect that the pilot circuits are not yet perfectly clean, being at least partially responsible for the overly rich running.
Over-rich running at any throttle position less than wide open probably does not involve main jet size.
Over-rich running at idle rpm when turning the pilot air screw has no effect is imo not due to jet needle configuration, or clip position, or slide type, or main jet size, and probably not due to the under-size #17.5 pilot jet (which according to the Mikuni chart should be a #25).
Would use the middle needle-clip position.
If not already done, would perform clear-tube testing to assure that fuel levels are not too high, because too high fuel levels can result in over-rich mixture at all throttle positions even with otherwise perfect carbs.
Might possibly involve an imperfect enrichener circuit, such as failure for whatever reason of the plungers to fully descend and close off the choke -- a relatively rare condition.
If not already done, the carbs should also be very accurately bench-synced.
Good Fortune!
1973 Z1
KZ900 LTD
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