Top End

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  Porting, Polishing & General Tinkering
  • Calum  

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  Kit 200CC to upgrade the Yamaha dtr 125
  • 2stroketerry  

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  Team BARacing. https://www.facebook.com/groups/1491149367841270/
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  Boyesen Reeds
  • jonne123  

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  Ok i will buy athena silencer because i need it.
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  New Athena 125 head get it ported or not?
  • Walney-Reptiles  

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  any info/help?
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  Too end rebuild - piston ring fittment?
  • SouthWalesYammy  

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  AHH!! Stop. You have to measure the piston ring end gap! And modify so that's within spec. It's common to see at least one, if not both, rings out of tolerance as it's expected that the user till measure and setup accordingly. The ring end gap tolerance is in the haynes.
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  ATHENA 170 CARB JETTING
  • andrew1990  

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  Irongamer on here used to run the Athena kit so might be worth dropping him a message, for a good starting point.
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  mick abbey tuning before and after
  • andrewj1680  

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  @Glynn123 Just picked up my re-bored and ported barrel off Mick yesterday, looking for £225 including royal mail 1st-class signed for delivery and a free Mick Abbey sticker. The Namura Piston Kit cost me £65 from p.j.m.e and Micks labour on top so £225 for all the parts is the best I can do.
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  Lapping
  • Bluestoesonnose  

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  Like with most things, the work is in the preparation.
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  It's all Calums fault
  • Bluestoesonnose  

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  @2stroketerry thanks for the kind offer but my head and barrel are on their way after a call to Mick. Seems for the kind of time I'm looking for a bigger carb isn't required
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  Athena 170 kit
  • 2stroketerry  

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  Yes mine goes off the clock as well as only 80mph on the clock and thats with a 16t, pulls well really considering I'm 6ft and 21 stone.lol
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  4FU vs Athena 170
  • DanRacing  

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  Yeah 4FU barrels are plated. So are the Athena barrels IIRC. It's about £130 to have it replated. PJME will probably drop a liner in there if you wanted them to.
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  Cylinder head
  • Bluestoesonnose  

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  Cheers, I'll call around and see if its cheaper than a big bore kit
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  3bn Y-1.......3bn Y-3
  head • • dt125Matt  

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  @dt125matt No, I mean I used Mick Abbey to get my cylinder done. Can't really comment on how it fairs to stock, since I did loads of mods and didn't really notice much...
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  Athena 170
  • Irongamer727  

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  @louis-james Don't know about TZR cylinders. But 3MB 3MBP 4FU Are bolt ons. The 3BN has a slightly bigger bore, so shorter stroke, as a result, a 3MB con rod will bit too long.
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  Dt 50 modified to 112cc vs Dtr 125 vs Yz 125
  • 2stroketerry  

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  How Many DT's in that video. That's mental. I bet over there they can actually keep their bikes without them getting nicked left right and center!!! :@
• V

  Best piston
  • vtrn_raptor  

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  @irongamer727 You can go overbore. Really need to modify the valve when you do. And you can have a new liner put in.
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  Time to change wheels and ...
  • Yegor  

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  @yegor Yeah, it's gotta be suitable for oil.
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  carb warmer hoses location
  • dan28  

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  They both go to the carb.
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  pinned powervalve gap or no gap
  • dan28  

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  the plastic pulley has to aligned with hole to be able to pin it though unless I glue a washer on to the plastic pulley to align it before the hole
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  Cooper plates cylinder kit
  • Irongamer727  

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  @irongamer727 I distinctly remember not using them on my rebuilds, so shouldn't worry