Maintenance & Technical > KX250 / KX125
'99 KX250 Rehab (Budget Rebuild)
ecdeyzel:
Thanks Fox. I am not going to take the second cover off. I am going to try and do it from the outside. I only need to replace the outside seal (hopefully) by the looks of it, it's in bad shape and don't want it to maybe get a leak and start wearing on the inner seal. There was no coolant in the oil, so I will leave that till a later stage when I can rebuild the bottom end.
I should be getting a Wossner piston kit for it soon, then the motor will be ready to go back together. I can't seem to get a hold of anyone that does deglazing of cylinders around here. I might buy a flex hone and do it myself, but do you think it's crucial? Will I have to take the KIPS system appart again if I want it done?
Thanks
Ed
Foxx4Beaver:
--- Quote from: ecdeyzel on March 11, 2016, 01:20:27 AM ---I should be getting a Wossner piston kit for it soon, then the motor will be ready to go back together. I can't seem to get a hold of anyone that does deglazing of cylinders around here. I might buy a flex hone and do it myself, but do you think it's crucial? Will I have to take the KIPS system appart again if I want it done?
Thanks
Ed
--- End quote ---
the problem with that is, you might not have the proper cylinder to piston clearances after honing it out...then you'll just be throwing a new piston into a cylinder that could very well be out of spec, and your ring end gap won't be correct, not good. There is a very slim chance you might get lucky, and have .005 clearance, but not likely. That's not to say it won't run...but it certainly won't be at it's peak performance either.
When a plating company does a re-plate, they require a piston that you're gonna use, so that they can set the tolerances to the correct spec with that piston.
ecdeyzel:
I see. Thanks Fox. I didn't know this, so good thing you told me. Will it be safe for now to just get the piston kit, install it and leave it at that? Thaks for the help.
Ed
Foxx4Beaver:
was the old piston a cast piston?...if yes, you won't be able to just throw a Wossner in it, because they're forged, and require a greater tolerance over a cast piston...and it'll seize up tight once the piston gets hot and expands...probably less than 5 minutes.
At this point, you'll either need to go with another cast piston...I think Pro-X makes over-sized cast pistons in 1/2mm increments(if needed)......or, send the cylinder out to be re-plated, and fitted to the correct tolerance for a forged Wossner.
Do you still have the old piston?
You need to find out what the cylinder bore measures right now, before going any further.
If it were me, I would send out the cylinder, and have it re-plated, and set up for a Wossner...that way you'll know it's all set, and good to go.
I know you're on a budget, and probably didn't want to hear any of this...so you'll have to decide which way you want to go with it.
ecdeyzel:
It's a lot less simple than I thought. I appreciate the help Fox. Doing all that will set me back a good couple of months on the build. Is using the old piston and rings an option for now and just replace small en bearing and pin? I can show you photos of the piston, but I will have to wait till we move at the end of the month as I have packed it all away. I also have no idea if it is forged or cast as of yet.
Ed
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