Engine

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  Gearbox Bearings
  rebuild size code gearbox bearing • • Calum  

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  Fitting electric start on DT 125 R engine.
  • 2stroketerry  

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  You'll need the DTRE/TZR Crank cases, TZR/DTRE Crank, fly wheel stator CDI, pick up and loom. Basically, you need a DTRE/TZR Engine.
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  The wr200 3xp / dt125r 3bn hybrid 200cc engine no.2
  • Louis James  

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  @Louis-James Looking good so far mate, nearly finished my latest engine and will post some photos once finished it. I've gone with a 60mm stroker crank from a blaster and spacer plate to raise the cylinder to suit.
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  Another head gasket question
  • Bluestoesonnose  

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  No sealant, just make sure the mating faces are completely flat. https://dt125r.co.uk/topic/11/how-to-i-gentle-skim-your-head-barrel
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  Top end gasket kit
  • Bluestoesonnose  

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  @Sgt-Robuck-5 Sounds like a bigger problem to me. I highly recommend Athena and of course genuine. If the surfaces aren't flat then no gasket will seal. I always recommend a quick homemade skim on the head and cylinder before refitting.
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  Crankcase breather
  • oldman  

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  @oldman lovely!
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  Engine Case Numbers
  • jamesdowning  

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  Yeah not sure why, ive seen 2nd hand cases labelled 3BN 00, 01 and 02. Maybe its the place of manufacture, or just subtle changes in materials or something? Ive noticed the 00 case has a couple of shallower indents on the outside of the case, and a couple of radius corners are subtly different. Could be a different manufacturer
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  Bearings for Bottom end.
  • jamesdowning  

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  I think it's one of each bud. Think. To be fair once you split the engine it should be obvious. They will be labelled appropriately.
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  This topic is deleted!
  • DanRacing  

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  This topic is deleted!
  • DanRacing  

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  Aprilia RS 125 Hydraulic Clutch Conversion
  • Calum  

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  @Calum COOL vid thanks bro!!!
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  Reading the Spark Plug Color
  • panmil92  

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  @finnerz89 Used to notice it a lot on my little 50cc Aprilia RS when I was kid coming home from a late night!
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  2002 DT125R Engine Build
  • Bluestoesonnose  

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  @Bluestoesonnose I would look in the Haynes manual for answers on this???
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  Spark Plug Heat Range Advice
  • NINJA  

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  here's another simple spark plug guide; https://www.briskusa.com/spark_plug_cross_reference_heat_range_chart
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  Fuel hoses
  • Irongamer727  

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  @2stroketerry Yeah that's more like it!
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  removing flywheel on a dtre
  • Bananper  

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  You'll want a fly wheel puller. And you'll need to lock the crankshaft off to remove it. Pretty simple job though. https://www.ebay.co.uk/itm/PRO-13PC-HARMONIC-BALANCE-CRANKSHAFT-GEAR-PULLEY-PULLER-FLYWHEEL-BALANCER/122134506298?_trkparms=aid%3D555017%26algo%3DPL.CASSINI%26ao%3D1%26asc%3D53530%26meid%3D7ad1578465b741d992b0a55ca04a7f02%26pid%3D100505%26rk%3D1%26rkt%3D1%26%26itm%3D122134506298&_trksid=p2045573.c100505.m3226 That for a DTRE, you'll need a different one for a DTR.
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  Cylinders 3bn 3mb 2rk 4dl ect
  • stinkwheeler  

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  @Calum ok mate will do thanks
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  Starter issues
  • Irongamer727  

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  https://imgur.com/a/dvpHDWy Went to a place where they teach welding and stuff today. A guy there made a pretty good job. Not knowing exactly what material it was combined with a dirty oily piece and I'm definitely happy. I'll trim down the piece a sticking up on the first image. Correct me if I'm wrong, does the starter wheel(the wheel that's connected to the flywheel) spin with the engine? Or does it only move when the starter is turned over? In that case, the tolerances shouldn't matter as much.
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  Is this a good buy?
  • Bananper  

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  There is a guy on ebay selling complete kits for 100 quid bought one a few weeks ago but he has more on there
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  Vibration problem
  • Bananper  

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  @Bananper The dog ears are in the gearbox, they are what shift the gear cogs into place from the selector drum. I can't see why there would play. The primary shaft is fastened against the case and the bewring.