Maintenance & Technical > KX500 Original
Siezed?
sandblaster:
I know you don't want to hear it but your better off splitting the cases and replacing the main bearings and seals.
There is nothing worse than short changing yourself and then having to do it any way.
Then again, it's only time and money :cry:
cbmoor:
That pistom looks the same as the one i just removed from my bike. The reason for my failure was the bike over heated and melted mine the same as yours. You say you needed a new water seal maybe your bike airlocked at the head and your bike overheated just a thought as most of the damage is on the exhaust side where it is the hottest part of the piston.
jonny500:
--- Quote from: sandblaster on January 22, 2011, 08:20:28 PM ---I know you don't want to hear it but your better off splitting the cases and replacing the main bearings and seals.
There is nothing worse than short changing yourself and then having to do it any way.
Then again, it's only time and money :cry:
--- End quote ---
sorry to hear of the problems
sand blaster is right. i would do nothing less the a full rebuild its just not worth cutting corners. expensive i know but in the long run its defo cheaper. the last thing you want is your expensive new parts getting destroyed by the worn out parts. new piston kit, conrod,mains and seals and recoat cylinder.
while i am here i will give my opinion as to why this has happen. from what you say in the first post it sounds like you had a clutch problem causing the motor to over rev also when rolling down hills in gear the engine can become starved of oil/petrol as you probably have the throttle closed. go karters when braking from a long fast straight pat there hand on the back of the carb to give a choking effect. this gives the motor a few quick blasts of oil and fuel. you cant do this on a bike so i normaly just pull the clutch in and give few quick revs.
Goat:
That's brutal! I agree with everyone else. I would split the cases and throw in new bearings and seals. Also check the crank journal for cracks or broken pieces. It would not surprise me if a chunk of piston lodged itself in between the case and crank. There isn't much clearance and if it did happen it could cause all kinds of issues if it's not fixed. Take lots of pics and if you have any questions there are enough of us on here to get a solid answer for you.
greencannon:
Ive blown one up pretty bad before too. The piston was melted on top and there was quite abit of shrapnel everywhere too. Turned out to be lean jetting and extremely cold air temp. But man, there looks to be quite a bit of dirt residue on the crank, inside of piston and cases in your pictures. Did you knock that in there while pulling it apart or could have you been sucking in dirt to cause that catastrophe ? I think Cbmoor is mistaken, that appears to be intake side of the piston right where dirt would get sucked in first and begin the damage process. Ive seen plenty blown up by a poor intake and aged piston, that sure looks like one.
Whatever the cause may be, I agree with others, if budget allows...complete rebuild if you want it to run strong and last.
good luck
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