Originally Posted by HondaCr250r
What are some common problems with the 08' KX450? Most importantly what are some noises the motor makes that are normal. I just got a new Kx and i have idleing problems when i first start it i turned the air screw up but it doesnt really help. Any input would be great thanks
The KX450 does not have an "air screw". The only screw you can see is the idle speed screw on the carb. There is a fuel mixture screw under the carb, but unless you have a very short and very narrow flat blade screw driver
( like out of a drill driver set) you will not be able to touch it.
Most idle, starting and running issues now days has to do with the very poor quality of the "E" fuels we have to deal with. They junk up the carbs and jets worst than anything we have seen in 20 years. The junk will not just wash off.
If you bike has set for more that a week with fuel in the carb, then it's time to clean all of the jets. They may not look dirty to the eye, but they may have a build up of this junk in them. The only way to get them clean is to use a welders tip cleaning set plus a very good carb cleaninhg spray.
One it's running good be sure to use a "gas stablizer" in any fuel to be used in that bike or any other small engine. It's a good practice to just add it to every can of fuel you purchase, at the time of purchase so that it will be in each carb all the time and this will help the issues of the junk build up.
Until we have better fuels we will just have to deal with it of run race fuel only as these current "E" fuels have done more damage to small engines than you would see form a good sand storm.
I see this everyday and I don't see it getting better!