I picked up a 1999 blaster this morning, the oil injection has been removed and the carb has been replaced with a new 28mm carb. My question is when the bike warms up and it is left sitting in neutral, the engine races extremely high like the throttle has been stuck in the open position. This one has me stumped. Any help is appreciated. Thanks in advance.

Kyle

 

Pull out the choke. IN the winter mine does the same thing. It isnt getting enough gas from the carb so it is running lean and revving higher than it should. Let it warm up on the choke, push the choke back in and then it should run normal. Hope this helps

 

blown crank seal! pull of the magneto cover and check it.

if it were the clutch side crank seal it's be SMOKING real bad.

take out the carb slide and make sure it's in right and debris free


make sure the air screw is in about where it belongs about 2 turns out?

make sure that the oil injector tube coming out of the carb is plugged!!!!

 

Check to see if you have a blown base cylinder gasket. My son's Blaster suddenly started revving up high (when it should have just idled normally), and we discovered that it had blown the base gasket.

I wouldn't run it in this condition if indeed the base gasket is blown. This puts it in a dangerously lean condition.

Regards,

Rog

 

We just rejetted the carb on his blaster and now it dosent rev as much as it used to. It used to rev sky high all the time but now it will do it occasionaly maybe once in 10-15 mins but i still dont like the idea of it running lean. Im going to go richer on the pilot still and see if it helps. If that does nothing then I will check for blown gaskets. Thanks for the help so far.

Tom

 

sounds like a air leak. maybe a gasket might not be blown but when its cold there maybe a small gap. but when it heats up the metal expands and tightins the gap up so it doesn't leak.