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  1. K

    Alert Indian welding quality- flywheel goes kaboom.

    Well, a nice end to the racing season- 9 laps at the second position and then 1 corner before the finish line the bike shuts down with an awful noise so my kid literally pushes the bike over the finish line for the last 50m. Damn Yamahas claim another 2nd position due to KTM inability to last...
  2. K

    Failing strator rivets

    Well, might be a one-off manufacturing fault of this particular engine or caused by the fact the CUP bike is used for the racing track, but last week there started to sound awful sound from beneath the stator cover after one racing session and when opening the side of the engine up to inspect...
  3. K

    Head gasket experience on 2017 and newer models?

    All right, another head gasket at our 2015 CUP went and this time it was even the Cometic thin 2 layered one. Oddly enough, this one behaved especially "sneaky" as the leak did appear only with the fully heated engine under WOT what made the initial troubleshooting even more difficult as the...
  4. K

    More preload to valve springs?

    Known aspect of the 390 engine I have learned is that the OEM components of the top end are susceptible for quick failure if in case used at high redline and racing use (have seen 30-hour engine top end being found to be almost at catastrophic failure condition ). Now fixing this not to be an...
  5. K

    Broken valve shim

    Yesterday while starting with the regular maintenance for the coming season, here was what I discovered while removing the camshafts to see why the valve specs were that out of range. To be noted, that is 2015 CUP bike and has some 25 hours at the engine spent most of the time at WOT, but...
  6. K

    RC 390 CUP WP suspention

    Hi, figured that more experienced track racers might share an opinion about the WP racing suspension found on CUP models? How does that stand up when compared with other aftermarket alternatives available and are there any convenient drop-in improvement options for WP forks to get the maximum...
  7. K

    390 engine connecting rod

    Hi, I was wondering to check if some of the more experienced racers/engine tuners would have anything to say about the strength of the OEM connecting rod of the early 390 engines? I noticed Carrillo is producing a performance "H beam" rod for 390 engine, but I have really not heard anyone jet...
  8. K

    KTM RC390 engine performance

    I was wondering are there any producers left who might be having availability for RC390 engine performance parts or is KTM really becoming obsolete for any more serious supersport 300 racing when set against tuned Kawas and Yamahas? RC390 CUP, it is a good machine out of the box when...
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