Engine

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  Gearbox Bearings
  rebuild size gearbox bearing code • • Calum  

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  Identifying cylinder
  • Bodylad  

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  It'll be a 3MB cylinder. You want the 3MB head to go with it. 3BN heads are restrictive.
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  Why are some clutches hard and some easy?
  • Irongamer727  

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  @Irongamer727 I rode a hornet 600 and it's pretty hard stock.
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  Floydy Racing
  • NINJA  

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  @NINJA said in Floydy Racing: Has anyone used these guys for engine work? Just looking at the photos of work they've completed their standard of work seems very high indeed. Well never even heard of him. But if you need any kind of engine work, hit me up
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  seals
  • britshgigolo  

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  @britshgigolo make sure that you get the right width bearings as the original are narrower than the typical ones for the DT's diameter
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  Athina 170cc bore kit recommendations
  tuning 170 bore kit athina 170 jetting • • harveymg  

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  @Irongamer727 that's really bad! im going to take everyone else advice and get a 4FU or 3MB cylinder instead with a aftermarket pipe and carb
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  Left side leak
  • jakeyboy  

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  @Calum isn't there a metal spacer as well? They can wear too if fitted and leak around the seal
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  CRANK BEARINGS !!!
  • jackthestripper  

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  @DTR-NSR yes they are narrower. Found out the hard way years ago when I couldn't get my cases back together......
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  Bogging when revved quick
  • Bananper  

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  @Bananper Get yourself one of these bud, give it a good swish around the bottom end and hopefully you will pick up any loose fragments; https://www.ebay.co.uk/itm/Flexible-Shaft-Bendable-Magnetic-Pick-Up-Tool-With-LED-Light-And-Strong-Magnet/391962870896?epid=15017009964&hash=item5b42cec470:g:L00AAOSwR0JUO~Ya:rk:720 Also change your oil 3-4 times within the first month after the engine is rebuilt, just to flush out any remaining debris.
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  Bought DT125X, cannot get it to start? Spark, fuel OK
  engine dt125x • • Lorant2  

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  @NINJA Thanks, I have to get the A1 licence now But the summer will be definitely fun!
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  Pre Mix Chart & Calculator
  • NINJA  

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  Yeah, most use 2% as a rule of thumb I saw a chart on the auto-pump back in the days, as I recall it pumped out 3-4% af WOT, and way less just idling or at low throttle operations. Kinda shows you the beaty of the auto-pump. Some info here: http://www.dansmc.com/2_stroke_oilpump.htm
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  Hmm now what (A Rebore!)
  • Pablo13  

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  @Pablo13 Got 4FU heads as well, squish is noticeably different on them. And the SP heads, which are O-Ring???
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  Quick question regarding oil.
  • jakeyboy  

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  @Irongamer727 Twas what ever was in Motorworld at the time and cheap. And has always worked fine for me.
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  What clutch for a WR200 conversion?
  • Bluestoesonnose  

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  @Louis-James said in What clutch for a WR200 conversion?: The ebc heavy duty clutch. Use bandit 400 clutch springs
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  Torque
  • jakeyboy  

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  @jakeyboy See here; http://www.dt125.cz/download/Service_Manual-DT125R.pdf
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  Somethings leaking :/
  • jakeyboy  

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  @declan thanks for clearing that up
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  125r and 125re cluch casings
  • stinkwheeler  

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  @DTR-NSR Yeah true, early clutch covers have different oil pump housings.
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  DT125 crank seals ?????
  • HondaLover  

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  @HondaLover Yeah try giving me a photo of the pump, not the cover. I actually don't know how to adjust the early type pumps. The newer types you can just adjust a threaded bar. I had an early type pump just inject way way too much oil. Never figured out how to fix it, just deleted it in the end.
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  High Compression Questions
  • NINJA  

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  @NINJA Hey, that's looking very tidy!
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  Coolant problem
  • Bananper  

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  Might sound silly but you are using a genuine head gasket or an Athena one yes?