intial throttle response

My 77 kz 650 has poor throttle response on the 1st eight of a turn. I have to fan the clutch to get it on the main jet, then it runs great. Also my plugs are black and sooty. Fuel milage poor too. I think it is my pilot jet, but what about the fuel mixture screw? thanks-Alex

Post edited by: atp, at: 2007/09/05 16:24

Any mods, or is it stock?

It has a 4 into 1 kerker with the filter pods, but these have been on the bike for many years. Nice c1... mine is stardust silver too.

Post edited by: atp, at: 2007/09/05 16:28

No hint as to what jetting... No hint as to what type of pods... If the pods are disposable Emgo type and have been on the bike for years, doesn't it make sense to buy some new ones as the old ones may be just a tad dirty and air may not be able to pass?

I'm a little confused about fanning the clutch to get on the main jet. :blink:
How does that help without the throttle?

I engage the clutch to take the load off or it will stall or sputter along until the throttle opens up.

How many turns out should my fuel screws be? (the srews on the cylinder side).

atp, The pilot circuit is lean... you need to feather the clutch and rev the engine to get it going. I suspect I understand WHAT the problem is but have no idea how to answer you since you didn't answer my questions... how can someone tell you how many turns out on a mixture screw if your pods are dirty or they don't know what pilot jets are in the bike? Good luck...

mariozappa, The problem isn't getting off the idle circuit to the main jet... it is that the idle circuit is too lean and he can't get off the idle circuit as the engine won't take a load since the idle circuit is so lean. This normally occurs with bikes that have too small main jets or they have pilot mixture screws set too lean. Most owners with this problem get frustrated because they can sit with the bike in neutral and rev the bike pretty cleanly... its only when the bike is under load that the leanness shows. The transition would be from idle circuit to jet needle/needle-jet (mid-range).

gotcha

Hello, I think I'm having the same problem. It's a 79 kz1000, 4-1 kerker, uni pods, 15 pilot, 110 main, and the air screw is at the factory 1 1/8 turns. does this mean i should try turning the screws in a bit, or does my jetting look off too. Thanks

Elwood, Be glad to help but you need to start your own thread on the issue. You have accelerator pump VM26s on your bike and since the carbs are different, there are different issues involved. Thanks