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First off, I know that there are multiple posts on the cast/forged piston debate. I keep jumping between being firmly decided on one to the next. Here's my situation. This is the first bike I've ever owned (1999 KX250) and have ridden it for 2 seasons now. I use it for mostly trail riding with a few visits to the local track to display how much of a noob I really am. I noticed piston scoring through the exhaust port and not knowing the history of the bike I opened up my can of worms. I am at the point where my head was sent out and re-plated (due to small chips in the plating) and I found play in the crank bearing so the case is now split in half. I ordered the Hot Rods bottom end kit (CBK0055) and swapped out my input shaft and output shaft first gear with a '97 transmission as found in other threads here on TT. The crank was a wiseco, but rebuilding it was not an option anyways as some previous owner decied that the crankshaft threads on the stator side were too long and cut off all but a few threads 🤦. So now that leaves me with the decision: What piston to use? Wiseco? Vertex? Pro-X? OEM? I know that many people like the wiseco/forged pistons for longevity. People stated that the forged pistons didn't need as much clearance as in the past, etc but these posts were back from early 2010's. I am leaning towards Wiseco as I assume if anything forged has become even more versatile but my thoughts keep thinking "How likely is it to cold seize? Is it more likely to score my new cylinder than a cast?" and "If more clearance is needed for forged should I be running a cast in my recently plated (stock size) cylinder?" I just tend to over think things sometimes but the last question is the one that is bugging me. Thanks for any opinions/help. Also, is the case sealant just like a high quality silicone? I hear people mentioning HondaBond and YamaBond is good for this. Is this the same stuff you use on for grips?
Had my bike tapped out on pavement then she locked right up, held the clutch, came to a stop, loaded her up, top end looks perfect. Trying to find the next best bottom end to OEM standards.. I didn’t expect anything of this kind of nature but here we are and I believe it’s only the bottom bearing on my rod, Hope I can get some suggestions on getting parts and also is there any suggestions for tools (crankcase splitter, flywheel puller, bearing and seal driver) as I’m on my way to Edmonton tomorrow for a break the bank kind of day, any opinions are greatly appreciated, thanks in advance!!