Maintenance & Technical > KX500 Original

Hi I need help with my 1986 kawasaki kx500.

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chrisorbics:
I bought a 1986 kawasaki kx500 b2 works replica for $500. This bike is in very good shape. I was told that the bike has about 50 original hours on it. The guy was selling the bike because it was his first dirtbike and he flipped it and has a scare on his back from it.

When I got the bike it had water in the gas. I drained everything and cleaned the carb. There was jelled gas in there. I installed an inline fuel filter to prevent more junk from getting in the there. I put fresh gas in and finally got the bike fired. I seemed to run good at the house and then I had big problems when I got it to the woods. When I got it warmed up and put the choke down the bike would run like crap and die out. It I rev the bike up with the choke up sometimes the choke goes down and the bike dies. The idle screw has to be set very far out in order for the bike to run. It is not even touching the piston inside the carb like it should be. Once the engine is warmed up and you put the choke down the bike either dies or it idles at half throtle.

After all this I thought that the rubber peice between the carb and the reed block had to have a crack through it letting air in. After looking at it it does have cracks in it but not all of the way through. Now that I have it all apart I can see some scratch marks going up and down the piston. I am going to try and find a compression guage today. The compression feels very strong. How low is too low for compression. Some people say 100 but I think that is too low.

I was also considering that the head gasket is leaking. Maybee even the base gasket but visually the engine is clean enough to eat off of. I would think if something was leaking that I would see something. I am going to try and think of some way to figure out if I have a leak.

Also the bike sometimes misfires one or two kicks before it starts. I have a b9es gapped at .025 in the bike right now.

As you can see I need some help. Any help would be great. This forum has so much info. I am glad to be a member and hopefully I can contribute to some other peoples problems.

Chris

alan:
You may have more than one problem! I would take the carb off first and make sure that there is nothing in the float bowl and make sure the pilot jet is not clogged up! Compression should be greater than 135, sorry I can't find my book at the moment! If you installed a fuel filter on it may already be clogged up from the crud in the tank!

I sure the other members will have lots more suggestions!

Alan :-D

Danger4u2:
Same as Alan, did you clean the tank and blow into it with air upside down?
I'll find my book for compression.

Danger4u2:
My book is a factory Kawasaki service manual for 1988 Kx 500.
Cylinder compression (usable range)
735-1150 kPa
7.35- 11.5 kg/cm2
105- 164 psi

Good luck,
Danger

chrisorbics:
Hi the carb is just sitting off to the side right now. I have taken all the jets out several times and cleaned them with carb cleaner.

This bike really has me confused. Does anybody know where the power valve cover is on this bike. I just want to make sure it is clean.

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