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Stumbling at 1/8 throttle
- daveo
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Patton wrote:
jumpship wrote: ...Clymer's said the more in you go the richer,and the bike is definitely asking for fuel which is the only reason why i went all the way in....
CV34 carb has a vacuum operated slide, and does NOT have a manually operated slide.
The Clymer is likely addressing a manual slide carb with a pilot air screw, and not a CV carb with a pilot "mixture" screw.
The side-located pilot air screw on a manual slide carb allows more air into the fuel mixture as it's turned out counterclockwise, and less air into the fuel mixture as it's turned in clockwise.
In the case at hand, would start with 2 turns out from lightly seated.
Good Fortune!
Often wondered about screw settings...every engine is going to require different turns-out depending on multiple factors, including not only the condition of the engine as a whole, but each cylinder's draw of air/fuel mixture requirement due to differences in compression, and potential air leaks and internal differences from one carb to the next. The variables are enough to drive a person nuts, so don't get upset...just take a deep breath, and start over if you have to.
Using the Gunson Colortune gizmo finally brought things together for my engine, after years of fiddling with the screws, thinking they had to be set the same across the rack.
1982 KZ1100-A2
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- bountyhunter
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jumpship wrote: Here's what I did on my 1 hour lunch. I started at 2 open, and results were very similar, than I went to 4, got a bit better. And believe it or not I went to 6 turns out, and the moment I started her up and got on the bike the issue was resolved and i mean totally! But after riding around for like 10 minutes the trouble came back. And the idle would be normal but drop suddenly.
Idle varying along with lean running condition sounds like an air leak somewhere.
1979 KZ-750 Twin
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- Patton
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jumpship wrote: Hmm might have to turn your head a bit LOL but here's what the manual said. I did find it funny that in would be rich... maybe I'm reading it wrong? I haven't tried the 2 turns out yet I'll let you know in a bit
Not reading it wrong, but reading about the WRONG carb, because the cited Clymer paragraph is about manual slide carbs with a pilot AIR screw.
The CV carbs at hand do not have a pilot "air" screw.
The CV carbs at hand have pilot "mixture" screws.
Good Fortune!
1973 Z1
KZ900 LTD
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- calebstrawn
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In my latest attempt, I took the stock jets, shortened them to match the length of the ones they sent me, drilled out the main hole to match the diameter, and drilled atomization holes (1/64 in. as tiny as I could find). My modifications were successful to the eye, but the bike still hasn't responded. I know I probably ruined perfectly good stock jets, but if anyone has any advice, I would love to hear it...
85 ZN700 LTD Shaft
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- jumpship
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1981 KZ750-4
Rode GS's all this time and once i hoped on a KZ... well... hence the name!!
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- calebstrawn
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85 ZN700 LTD Shaft
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- jumpship
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1981 KZ750-4
Rode GS's all this time and once i hoped on a KZ... well... hence the name!!
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- calebstrawn
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Jumpship, if your's is still stumbling off idle, I'd look at raising the needles a shim or two. I have mine at 2 shims up. Increasing the primary jet size effects it mostly at wide open throttle, from my understanding.
85 ZN700 LTD Shaft
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