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Found 6 results

  1. Illuminated onyx

    1980 kdx 400 HELP!!?

    So ive recently had my main clutch basket nut and the crankshaft nut come loose and I've finally fixed that. Now ive noticed a slight ticking noise kinda like a piston slap it sounds like it's coming from the top end and when i took the head off theres a part of the head that is clean metal and no carbon so I assume its that, I couldn't feel alot of play in the bottom end bearings but I didn't take the cylinder off, i just pushed down on the piston, new head gasket is on its way. Should i run it how it is and what would i have to replace to get rid of the noise or should i sell it? I don't have a ton of money to dump into rebuilding this thing as im only 16. Thanks for the help!!
  2. Illuminated onyx

    So i bought a 1980 kdx400...

    I have recently bought a kdx400. Its not the prettiest thing but it runs(with rough edges) recently its been running odd. When you kick it over it'll start with a slightly high sounding idle but its not screaming but then after riding for a bit it starts reving high enough to putt around in 3rd gear without touching the throttle. The cable and throttle tube are pretty sketchy but its not getting hung to my knowledge ive adjusted the idle down to barely nothing on both the throttle tube and the cable end of the carb. I backed the throttle stop all the way out while it was idling high and it did nothing. A few days prior to this it would start up and scream but i chuck that up to one of the idle nuts backing out and bringing the idle up. I do notice its leaking oil from a corner of the head gasket but I don't think that it would cause it to idle high like this. I can add pictures if they would help. Any help is appreciated!!!!
  3. Heres the noise. Sounds like its coming from my top end..,
  4. Illuminated onyx

    A piston for a 1980 KDX 400

    Does anyone know another bike that has the same bore x stroke as a Kdx400? The KDX is 80 x 78. Im looking for a piston that will fit in it fairly easily..
  5. Illuminated onyx

    Side to side play on a piston?

    So after listening to a tinging noise in my top end for a few days I pulled it apart finally the piston has alot of side to side play on the rod, the bottom end has a small amount of side to side and no up and down, is it normal for a ton of side to side play in the wrist pin area, its an air cooled 80' kdx 400. Also im not replacing the piston/rings because it had plenty of compression/lack of availability is there a break in period for the needle bearing/wrist pin?
  6. This is the cylinder to my 1980 KDX 400 A2. I can't decide if its plated or sleeved, a magnet sticks to the inside of the bore but i saw someone say its eletrofusioned with molybdenum so it could be the coating that's magnetic.... it still runs with compression but i hope to sleeve it this winter with a steel or iron sleeve so i can bore it as needed.
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