Maintenance & Technical > KX500 Original
Siezed?
greencannon:
Man this situation is sure turning out to be a nightmare for you. Sounds like the guy you purchased from should have no business owning a dirtbike, poor bike....
There is a plastic gear in the clutch case that actuates an arm which controls the powervalve arm. It spins a unit that moves back and fourth by centrifugal force with ball bearings and a spring. It adjusts according to the speed of the gear turning it and the engine rpms. Im wondering what is happening there while its trying to move but the powervalves are not....id look close for any kind of wear or damage and make sure there is proper operation there on that end.
That thing must have been running like a weak 250 at best, considering it's condition
littlewing78:
No, he shouldn't have a bike. He has a KDX right now and I am pretty sure it has been sitting outside all winter uncovered. I did see that lever that is meant to move the power valves. The thought did cross my mind that something must be going on inside if its not allowed to move when it should. Maybe since it is controlled by centrifugal force everything will be ok. No real solid connections. I will look into that when I open it up. The bike did have pretty good power but surely not what it should. I don't have much to compare it to. The only other bike I have ridden is that guys KDX and my KX blows it away. I got the bike for $750 so putting a little more into isn't breaking me yet.
Goat:
Ebay is your friend. When I completely rebuilt mine I looked all over the place for parts and found out 98% of the time ebay was the cheapest. If you do your homework you can fix everything as it were new for a decent price. I think mine ended up costing $1100 total to completely rebuild the engine. I did have to buy a new used cylinder and case halves so knock $370 off the total. Only thing that I didn't mess with was the rod/lower bearing & trans internals. All bearings, seals, gaskets, piston and rings were changed. I even got some parts from Sandblaster (OEM Cycle)
littlewing78:
E-bay does have some awesome deals. I just got a nearly brand new seat for $35 shipped. Rocky Mountains prices for new stuff still seem to be better.
So I played around with the motor a bit tonight. Mostly just looking for obvious damage. Aside from the piston I cant find anything else broken. I checked the water pump and it's fine. I think the seal is bad because my oil comes out milky when I change it. But wouldn't I be getting oil in my coolant? There are no sign of any at all in the water pump. I pulled the clutch plates to see if there is any obvious damage to those but I don't see anything. What should I look for with clutch plates? With it all together, I pulled the clutch lever and all seems fine. I can see the pressure plate releasing while I pull it. So no problem there. I don't have a big enough socket to remove the baskets so that's as far as I got. I am pretty certain that I need a new seal at the output shaft. When I lay the engine on that side I get oil leaking out. So Is it possible that my bike would act like it did with bad rings? I am just hoping that's the only major problem.
1989kawasaki:
often ebay has unbelievable deals on bike parts i bought a reed cage, front fender, brake caliper , hose and master cylinder all for $1 each :-o
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