Maintenance & Technical > KX100 / KX85 / KX80 / KX65 / KX60
Kx85 going thru cranks
85#371:
My son has a 2014 kx85 we bought the bike from Garrett marchbanks it has pro circuit cylinder carb and head the bike was set up to run mrx-O2 fuel and we swapped heads to run a cheaper c-12 fuel my son ran the bike roughly 15 hours after purchase and it started missing at higher rpm I cleaned carb,replaced top end,replaced reeds,swapped Cdi,stator,coil and it still had a miss on higher rpm' only thing left was replace the crank and that worked now 15 hours later it's doing it again I called PC today and they said it's because I used a hot rod crank and I need to use oem. I Connor keep putting cranks every 15 hours in this bike unless I get lucky and win the lottery. Any answers would be much appreciated
Foxx4Beaver:
Hot Rod cranks are the worst quality you can get.
My buddy was replacing them every 4 races in his kids RM80...and every 6 races in his YZ250...and they're only mid to front pack amateur riders.
Once they switched to the more expensive OEM cranks, he hasn't had any issues.
Try Wossner...I'm not sure if they make kits for the 85...but maybe our members Alward25 or Greenkaw24 can assist on that. Wossner is high quality from Germany...check them out...
http://www.wossnerpistons.com/
Have you done any wide open plug chops to be sure it's not leaning out on the higher revs?
dan580,95 moto:
i brought a hotrod conrod kit for my 95 kx500, got it installed and built my bottom end but after buying a brand new cylinder decided to take it all apart again and remove the rod. i never ran it after everyone telling me that it would end up through my crankcase or worse my new cylinder. :x :x :x :x :x
Foxx4Beaver:
--- Quote from: dan580,95 moto on March 30, 2015, 12:31:54 PM ---i brought a hotrod conrod kit for my 95 kx500, got it installed and built my bottom end but after buying a brand new cylinder decided to take it all apart again and remove the rod. i never ran it after everyone telling me that it would end up through my crankcase or worse my new cylinder. :x :x :x :x :x
--- End quote ---
EXTREMELY wise move :wink:
sandblaster:
--- Quote from: Foxx4Beaver on March 30, 2015, 12:33:38 PM ---
--- Quote from: dan580,95 moto on March 30, 2015, 12:31:54 PM ---i brought a hotrod conrod kit for my 95 kx500, got it installed and built my bottom end but after buying a brand new cylinder decided to take it all apart again and remove the rod. i never ran it after everyone telling me that it would end up through my crankcase or worse my new cylinder. :x :x :x :x :x
--- End quote ---
EXTREMELY wise move :wink:
--- End quote ---
+1
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