I have kawasaki 300 bayou 4x4 1989. it idles and starts perfect but when i give it gas it boggs down and then dies.i've replaced the spark plug, rev limiter, clean the air breather and carb, set the valves and made sure its in time.if you put the choke on full it seems to help a lit but it still wont hold a steady rpm rev
Motorcycles - kawasaki - KLX 300 - 1998 kawasaki KLX 300
Answers & Comments
Sounds like it has sat for a while. I had a Suzuki 850 like this. It turns out that when a motorcycle carburetor sits, main jet, and the needle that goes through it, oxidize. This causes the metal surface to grow. The jet's inside surface growing makes the hole smaller, and the needle's surface growing makes it fill the jet too much.
Replace the jets and the needles that go through them.
Make sure the carburetor's diaphragm that opens the carb is in good shape, if it has one.
Hey brian this atv has sat for a year at least. I thought i clean the carb very good but I went ahead and ordered carb kit just in case. The slide is in very good shape so I will wait till part comes in go from there. Is there anything else you can think of that ive missed. A lso when I was cleaning carb it was very oxidized how can I make sure the act. carb's pathway is doing what you said.Or is the jets where the most important flow and mixture occurs.
Jets and needles are cheap. You should just replace them irrespective of how they look. This will probably solve your problem, and if it doesn't will put your mind to rest as to whether oxidized jets are the problem.
I am without doubt that this is a problem of fuel starvation when you open the throttle though.