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  1. TRX General Discussions
    i’m rebuilding my 400ex top end I already bought a niche cylinder becuase mine was done for and i heard nothing but good out of niche cylinders. Obviously i’m trying to save money if possible i was wondering if the niche pistons are reliable and do they last long?Ive already bough some new...
  2. Engine/EFI/Drivetrain
    Hey guys, new to the forum and an amateur mechanic lol. Got an 05 400 ex recently that started and ran when i got it but ticked pretty loud. Found there was a bad bearing and dowel pin missing for the cam, that caused the chain to stretch a bit. I replaced the cam chain, guides and tensioner...
  3. Maintenance / Important Information
    Recently put a whole new head assembly+piston and valves onto my 400ex because of oil burning and smoking issues. Now, it won’t start and won’t fire on starting fluid. Timing is set, valves are adjusted, and has weak but consistent spark. Any thoughts as to what this could be would be greatly...
  4. Maintenance / Important Information
    I could not find a service manual for my 94 300, could anyone tell me what my ring gap should be? Also if you guys know where I can find a online manual can you help me out. Thank you
  5. Engine/EFI/Drivetrain
    I have a 2002 400ex and recently did a top end rebuild. I put in new rings for a 416 piston and new rocker arms. Seals and stuff too. I have already let idle For 20 minutes, cool. Then 1/4 to 1/2 throttle variation for 20 minutes, cool. What would my next step be to break in the new rings?
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