Top End

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  Porting, Polishing & General Tinkering
  • Calum

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

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  @glynn123 It's advancing the whole ignition system which is less than ideal. Increasing the risk of detonation and pointless if you just get an aftermarket ignition system since you can alter the spark electronically.
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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!!!
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  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
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  This topic is deleted!
  • vtrn_raptor

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  Pv turned when running?
  • declan

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  @Calum appreciate the help as usual
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  Photo of pv servo needed
  • dan28

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  Kpmotosolutions
  • andrewj1680

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  @Darty Oh yeah, I mean RS's are used to commute from and the stock porting on those are nuts lol
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  pinning power valve parts needed
  • dan28

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  @andrewj1680 said in pinning power valve parts needed: You could always just stick a big washer behind the bolt that runs through the middle you can lock it off that way which is what I have ended up doing today as since having port work and the power valve modded it kept moving a little over fully open I ve bought the servo kit I can use the standard parts to pin it now or if I can get the servo to fit my frame I will use it (the dt engine is in a different frame ) its gonna be a mission to get the servo to fit I wanted to mount it under the tank but the cables are too short not sure it will be worth the hassle
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  Dt200r cylinder
  • andrewj1680

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  @Louis-James thanks mate appreciate it I'll get on it tomorrow first thing, there is nothing wrong with the crank in it but knowing my luck they will have discontinued it by the time I do need it lol always the way ain't it
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  port enlarging
  • britshgigolo

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  If you really want to learn more about it then I recommend reading Graham Bell's Two Stroke Performance Tuning. Very good book and will explain a lot.
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  mick abbey tuning before and after
  • andrewj1680

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  I need to get mine sent of to mick!!!!! We're off to see the wizard!