Top End

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  Porting, Polishing & General Tinkering
  • Calum  

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  Barrel spacers?
  • LucasHutch  

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  Hi all thanks for all the advice it’s really helpful! Yeah he had to skim a lot off because it looks like someone Had prized off the head before with a screwdriver or something and made a big gouge in it! I’ve ordered the copper gasket (budget reasons ) so I’ll try that and see how she goes but if not I’ll give a new head a go. I’ll post an update soon
• R

  3BN Cylinder
  • rubberfingers  

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  @rubberfingers Some have a diamond shape on the pulley end but they all take the same pulley - worth noting so that when setting up you get it the right way round. Best thing thing to do would be to feel up the port with the exhaust off. I have both a 3SH TDR125 and a 3XP 200WR if you need any info - both engines are in one piece though so cant comment on the internals right now
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  Portmap for a 3mb barrel?
  • Arild  

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  @Darty ohh okay i was unsure with the rotax engines, i thought i remember seeing an aprilia sx 125 with 35hp somewhere but it was probably wrong Also im not sure on all the different ktms but i know there are loads of supermoto over here pushing 40hp, dont know about theyre torque but theyre going quick and pulling wheelies like its nothing
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  Cylinder heads..
  • dt200wrman  

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  @Calum thanks for the reply callum. I have a good source of parts so can get the head no problem
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  Options, Options, Options but which ones the best?
  • Stevie Wonder  

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  Yes I'd like to go down the Mick Abby (sp?) route as well but also get him to build a pipe to match the tune along with a new matching ignition set up. For me the main aim is always to have s bike that runs right with nice healthy mid range power rather than completely all up in the very top end of the rev range.
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  Ported Athena 170 kit with 34mm Carb and Athena System
  • theportingmaster  

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  HI, ALL SOLD NOW..
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  Engine died, Diagnosing why
  • CalDT125  

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  @Calum the beauty of 2 strokes is you can take the cylinder off really quickly. I'd definitely pop the exhaust off and look up the port. You can buy and endoscope for £5 that plugs into your phone
• J

  Boyesen Reeds
  • jonne123  

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  And i know that reeds give throttle response and exhaust changes the powerband and maybe gives little extra hp
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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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  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...