My 81 kz1000j starts instantly when it's cold. Pull choke, press start button, 1/2 second later, bike is running. 10 seconds later, push choke halfway in, 15 seconds later, push choke off. Bike runs great on the road. But, after the bike warms up, it doesn't start as easily. Sometimes, I have to slightly open the throttle and it will start after cranking 1-4 seconds. Once started it idles and runs perfectly again. Fuel adjustment screws are 1.5 turns out. I've also tried them at 1.25 (factory recommend) and 2.25 turns out. A couple of the valves were on the tight side so I adjusted them slightly. Bike only has 9000 miles on it and looks brand new. It bums me out that it won't start instantly when warm/hot because when someone is looking at it when I'm out for a ride, I want to impress them by starting it up for them. Any ideas? Thanks!
Thanks! I wondered about that. It did seem to help slightly after I loosened 3 of the valves. Overall, I wouldn't describe all 8 valves as being on the high end. Next time I have the tank off, I may go back to 1.25 turns on the fuel screws.
By Kz81: ... Sometimes, I have to slightly open the throttle and it will start after cranking 1-4 seconds. Once started it idles and runs perfectly again. ...
From my 81 650 OM: when the engine is already warm or on hot days, open the throttle part way instead of using the choke.
Something else I do is set the petcock to PRI for a few seconds before starting, then move it back to ON >> in case there was fuel evaporation in the carburetor bowls, either because of a hot engine or from sitting a couple of weeks.
That's very interesting that the owners manual says that. I'll start doing it from now on. I will check my om; it may have the same recommendation. My 05 vstrom om recommends doing the same thing when cold because it doesn't have a choke or fuel enricher. I'll try the prime position as well when starting warm engine. Thanks!
Many Kawasakis were jetted lean from the factory, so opening the throttle part way probably allows for the uptake of more fuel to compensate for the lean condition. That's my theory anyway. hee. As for the fuel tap, I switch the petcock to PRI, put on my gloves & mount the motorcycle & maybe do other stuff, then switch it back to ON. This usually allows plenty of time for the float bowls to fill, if needed.