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• DTR

  DT125R Owners Build
  218 Topics

  5k Posts

  C

  Make sure that the air waves are cleared on your bike, you don't seemed to have mentioned this.

  So there is nothing nasty blocking your intake solution. A quick, dirty, way to confirm this is to just remove the airbox to carb joiner and take it for a quick run. Sounds like it's running rich, so doing this should cause the bike to lean out. If it's only for a short time it shouldn't hurt. You just want to know if it's getting air.

  So check the airbox and renew the filter if you find that removing the boot fixes the issue.

  The other common problem is water getting into the exhaust expansion chamber. So cleaning the exhaust is really vital for a two stroke. I've seen this before where a bike was sat for a long time and the exhaust was full of fluid. The bike would refuse to run if this was the case.

• DTX

  DT125X Owners Build
  23 Topics

  350 Posts

  C

  But what you're talking about is replacing the whole ignition system, flywheel, pick up, stator and CDI because you don't want to have your RE/X crank rebuilt.

  Which PJME do for £40

  https://www.pjme.co.uk/acatalog/Yamaha-DT125R-DT125-R-Crank-Rebuild-4121.html#SID=1170

  That doesn't make any sense

• DTRE

  DT125RE Owners Build
  34 Topics

  600 Posts

  D

  Father passed away a few month ago and left me his dt125re.

  Snapped the oil bolt a and me and my friend took.it apart and extracted it and replaced it along with the casing gasket. ( first time doing it everything went back.together fine )

  Took it out and it started overheating ( warning light and if top end would.make your finger sizzle when wet )

  It had coolant in but when i pushed it back.home expansion tank was empty.

  Filled if back up and it did not circulate.

  I think.we managed to bleed it and topped it back up and went out for an hour for a proper ride and didnt overheat.

  However it wouldnt kick over and was no spark.

  We managed to bump it so we could let it idle for abit before we bled the cooling system.

  What could be the problem here with the coolant and the spark?

  Also i premixed the fuel as wasnt too confisent with the 2 stroke pump as i put a.marker on it took it out for a good hour of solid riding and the levels havent moved , if they have its absolutely miniscule.

  The front headlight also.seems to be very hot to the touch.

  Im not.mechanically savvy but trying to learn as best i can.

  Can anyone shed some light on these problems?

  Also i used castrol 5w 30 oil is this ok or should i change next time i go out on it?

• TDR

  TDR125 Owners Build
  23 Topics

  347 Posts

  C

  It's probably fine. I'd just do a compression test make sure it's within tolerance and schedule in a top end refresh if you don't know when it was last done. Generally though, the DTR is a pretty strong engine so it's damn reliable.

• TZR

  TZR125R Owners Build
  5 Topics

  184 Posts

  S

  alt text

  Or the Tizzer?!…

  Which would benefit and suit it more?…

• Other

  Other Builds
  59 Topics

  2k Posts

  C