I am out of idea. When the bike is warm or when i wait on a red light or stop at a stop sign,the RPM will just drop andrun very badand when i want to go ahead, the bike ( 1994, 900rr)
hesitate a lot . I have to let the clutch slipped. I did try everything and change everything. The only thing left is to look at coil ect...
Need some help.

 

Sounds like mine when I put a new pipe on it. It needed a re-jet. Does it run better at cruise speeds or higher RPMs?

 

Is the idle set too low? Try turning the idle know (on the left of the bike) in just a hair.

 

just curious are you having trouble starting your bike ?

 

It is running great at cruise or high rpm. It's only when i want to go from a dead stop.The bike start great first try every time.
I own this bike since 1999 and never had a problem with it. It strat about a year ago. My idle is set at 1300 rpm+/-.
When i start the bike, he is running great for about 10 min and as soon as he gets hot, that is when the problem start.
I changed the plugs, gas filter, clean up the carbs, air filter....I am thinking of buing a new set of jets and main and change everything again.

 

Is the petcock working correctly? My diaphram was torn and gave me some issues. Perhpas the coils are to blame. When they get warm from sitting with the engine cooking them they may start mis firing. Just a couple of thoughts.

 

That's what i was thinking. I will check at the voltage when they are hot
Thank's.

 

It also sound like the motor is ingesting a lot of hot air. As the speed increases, it washes the hot air out of the airbox--assuming you're running an airbox.

But check the coils first.

--Chris

 

Good point. I did take off that plastic plate in front of the 2 air box intake few years ago.

 

Good point. I did removed that plastic plate that is under the 2 air box intake years ago.