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Old 01-29-2018, 06:53 PM
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Default 1997 CR125 CYLINDER REPLATED & crank question

     

We just picked up a 1997 CR125 and has a nice gouge down it from the ring locking up. The head is all dented up. So what company does the quality work at a good price to re nikasil plate and clean the head up? They also took the stock crank out, which was fine and put a Weisco one in. Should i split it and get the stock back in there?
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Old 01-31-2018, 11:35 AM
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I've used PowerSeal and US Chrome. Both cylinders have been up to par.
Here's my experience with each:
PowerSeal- The cylinder was good. My only issue was that they claimed the exhaust bridge was broken and they had to weld it. That MAY have been the case as this was from my first ever rebuild. However, I didn't notice anything before shipping it to them.
US Chrome- I did their exchange program after PowerSeal informed me a KX125 cylinder I sent them was beyond repair. I sent US Chrome a picture of the cylinder and the person who saw it responded that it looked like regular flaking and that it should be fine as a core exchange. The cylinder I received from them was a quality piece. I sent them the core and SURPRISE, SURPRISE! The core was "not good" because the ports had been worked on and polished (I would think this would be an even better core that would sell for slightly higher...) I'm waiting for it to get shipped back so I can have a very nice paperweight on my desk.
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Old 01-31-2018, 05:55 PM
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Default Weisco vs oem crank

Just bought this '97 CR125 and they put a Weisco crank in it in lue of the OEM The OEM rod bearing feels fine to me, so since I have the jug off getting replated, should I split the case and put the oem back in. Not looking for work but I want it to last. And with these parts getting harder to get, is it worth putting a piston in them before failure?
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Old 02-01-2018, 09:28 AM
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Wiseco had some issues back in the day (I've read). Some say they've sorted them out. Given the year and unknown condition, I would do a basic rebuild (crank, main bearings, main seals, and a fresh top end). Piston (and cranks every so often) are a routine maintenance item on dirtbikes. Hardly anyone does that maintenance, but that doesn't change the fact that they should be swapped regularly based on riding conditions. In short: Yes, you should definitely put in a new piston and highly consider putting in a good replacement crank (Hot rods or OEM)
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Old 02-03-2018, 09:31 PM
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Default Best piston to use for '94 and '97 CR125

When freshening up a top end, what piston is best for my '94 and '97 CR125. Namura Hypertaunic or Weisco or who else? Cast or forged? Should I stay away from eBay or try to find a deal there. I don't race.
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Old 02-06-2018, 09:37 AM
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I don't have any personal experience with Namura, but would avoid it simply on the premise that there are reputable companies out there that have 125 pistons at very affordable prices (Pro-X, Wiseco come to mind).
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Old 03-05-2018, 09:53 AM
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I'm going with a Pro X cast piston. What should my piston clearance be to the wall and what should the ring gap be. '94 CR125
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