help please

i have a 1981 kz1000 ltd with 29mm smooth boores just recently i got a miss between 4,6 grand i changed the main jets from 118 to 115 and i got rid of the midrange miss but now i have a low end miss the pilots are 27.5 i had no problems until about a week ago it ran just fine if anyone can help with this problem it would be appreciated thank you

Probly the "Corn"fuel thier adding.:silly: :dry:

What RPM range is the low end miss?

the bike idles fine but when you take off the miss starts as soon as you put a load on the motor to take off starts around 1200 clears up about 2500 but in nuetral you can rev the motor up without a problem

27.5 is way to big for a pilot jet. Maybe 17.5, would work just fine. It should not need anything bigger.

we went thru all the pilots from stock up to 27.5 its a j head so i dont know but it seemed to want alot moore fuel when i set it up it ran like a scalded dog all summer till last week and i changed nothing jusomething electricalt started running like crap its got me confused on if its carbs or s

Check your valve clearance. I have been chasing down a miss on 1and 4 cylinder and after going through the electrical i checked the vales and 1 and 4 had no clearance. Run like crap unless it was wide open.

17.5 should be fine on pilot jet. Roy

1981 ltd wrote:

the bike idles fine but when you take off the miss starts as soon as you put a load on the motor to take off starts around 1200 clears up about 2500 but in nuetral you can rev the motor up without a problem

Thats exactly the problem I'm having!

I think I have a pooched coil. After changing to really good wires, and new plugs, with 12V @ the coils, it runs much smoother.

But still an occasional miss...

I have a colortune plug (you can see thru the plug into the combustion), and the spark starts to weaken (turn yellow), then dissappears completely till I rev it. Then it comes back blue, but starts to weaken/die again @ idle.