I just picked up an 01 blaster. The engine is bored .60 over and is only about 2 hours into its break-in. It was running great w/ the fuel that was in the tank when purchased. After that ran out I refilled with a 32/1 mix. Since then the bike will not idle. If I keep on the throttle it runs fine, but once I let off it seems to be choking and then dies. Does anyone have any clue what could be causing this ???? Thanks.

 

I think your 32/1 Ratio is a little rich. Try 40/1 ratio!!

 

while this thread is open, i own a 1999 blaster, and it idles so high i cannot keep it running if i am not in motion. i am afraid something bad will happen. it starts fairly normal, then revs up and up and up so if i dont hurry up and put it in gear and go, it will rev to the moon. how can i fix this? there appears to be only one adjustment screw on the carb, and i have tried turning it out and in to no avail.

 

is that when it is cold? If you pull the choke out it will go back to idle speed while it is warming up

 

this is while cold and warm and hot and every tempertaure, all running conditions, with choke on and off. it always does it.

 

You need to remove the carb and clean it very good. Remove the pilot jet and make sure it is not plugged up.

 

Have you check the T.O.R.S ? thats what it sounds likt to me , you will find that right over the carb , I would check that first and go from there.

 

I just ran into this problem yesterday. I had put on a new Keihin 36mm carb and it wouldn't idle. I turned in the idle screw all the way until I even broke the plastic screw off! It still wouldn't idle. Of course the new carb doesn't even have tors.

But I suspected the tors was still working on the ignition. So I took the little switch out of the thumb throttle enclosure. After that it idled great! But the screw is still broken off in my carb!

I can back the screw out of the carb. I'm going riding today, and hope I don't lose the screw that's left in there.

Anyone know where to get a new Idle adjustment screw for a Keihin?

Iz.

 

Wouldnt turning that screw all the way in completely cut the engine off of gas at idle? I think stock is like 1 1/2 turns out and turning it out allows more gas through to the engine at idle. Tell me if im wrong here.

 

Sounds to me like you have a air leak..Better go through everything and check becuase air leaks will kill a motor..Do you have access to a compression tester and a leak down tester??