Maintenance & Technical > KX500 Original

locked up motor. PLEASE HELP!!

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KTMEXC125:
i went out riding today on my new k5 that i just got a few days ago. i started with some tight trails and i loved it! it was a tractor! a really fast tractor! after i was done barking around the trees i went out on the country gravel roads. i never got on the pipe or cracked the throttle open. i was just cruisin. i pulled it up on this little highway that runs through the area and i started out just rollin on the throttle. i probably got it up to 70-80 mph with no problem and it still wasnt full throttle. i had went for about 50-60 yards with it goin almost 80 (i was smokin by cars with ease  :-D) and all of the sudden the rear wheel locks up and the back end starts sliding around. i thought i was gonna kill myself. i pulled in on the clutch real quick and rolled it into the ditch. it would kick over but had little compression. and then i pushed it home 3 miles wearing moto boots. not fun. hahaha. i had a 2001 kx125 that did the same exact thing and in the same exact place a year ago and the skid mark is still there. i was haulin that time and had an antifreeze leak so it got hot. on my k5 i think the oil mixture was too lean and it was cold outside so that made it even leaner. it was the same gas that the previous owner had in it. i wish now that i would of drained it and mixed some up myself.  i know that the top end needs to be replaced and i assume that the cylinder probably has some gouges in it and will need to be replated. ive rebuilt top ends before so it wont be a problem for me. what i need is some information on cylinder replating or resleeving. a friend told me that if you resleeve a cylinder that it will never run like it used to. what would replating cost for the k5? i just started to love this bike so i want to get it up and running again. also what can i do to detune it while im going to be working on it. what headgasket thickness should i use and reed spacer and fly wheel weight should i use. and one more thing, my 500 is super loud. it has a gnarly head pipe and stock silencer. what silencer would make it easier on the ears? i live on a farm and it scares the cows and my hunting dogs

ID KX500:
Angels were watching out for you :-D.
Tear into it and find out if it needs a crank. Top end won't be so bad,, but top and bottom might be spendy. I suggest not de-tuning just maybe make it smooth from bottom to top (but do it the way you like while you're at it). Check with stewart here on this site when you find out what all it needs. He has many refined rebuild ideas to get the performance you want in a KX500. When you're done you may be able plow fields with it. Good luck.

BDI:
Sounds like you already detuned it  :lol: :lol: :lol: :lol:

k5abuser:
i help stewart and we can help . just shoot him an email and let us know what you want from your motor . watch vids on youtube under me as / k5abuser / and also the guys that set the land speed record listed on youtube under / wolbrinkrace. thier motor we built them held up though all they could throw at it in on the saltflats . wide open thorttle for about 20 plus runs . i think they are out riding it now for fun and have not rebuolt any of the motor.

BDI:
I think a good mod for someone who wanted to take some of the bark out of the k-5 would be to recut the head. I would recut it the way that stewart cuts them but I would set the comp at 10:1. I think you would still have excellent performance but the bike would be very rider freindly. I think a full tilt stewart motor with the comp set at 10:1 would be a bitchin motocross bike.

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