Engine

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  Gearbox Bearings
  rebuild size code gearbox bearing • • Calum  

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  Athena Big Bore kit fuelling problem
  • emiljay  

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  Managed to find it, extremely small split in the inlet manifold so it was pulling extra air into the engine. Thanks for all the help though guys!!
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  Dt125r making noises in high rpm
  • Bananper  

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  @Calum everything seems to be right. Ypvs works. I pulled out the plug yesterday, on the end of the ground electrode there were a small bit of carbon, i thought that was causing the problem. I swapped the plug, and same thing happens when the bike gets hot. Could it be pre ignition? I've read that carbon deposits on the piston could cause pre ignition when the bike heats up.
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  Wr200 Airbox/DTR Airbox mod
  • dtStevie98  

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  My thoughts are the standard airbox is quite sufficient if you remove the snorkel. you would only benefit from making that hole another few centimetres bigger and thats if you were fitting a larger carb which wouldn't really have much benefit unless you had atleast mild porting or head work zeeltronic ect ..
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  Coolant going to the expansion bottle
  • Bananper  

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  Pick up a cap from the Scrappy, any car one with the same pressure will work aslong as it has the old style rad cap. You'll pay Penny's for it.
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  Dt 125 to DT200r engine swap
  • mhbikesnbits  

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  @mhbikesnbits not restricted in any way. Always tuneable
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  Dt125 counter weight shaft thread
  • tylerf  

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  buy yourself a thread restoring file - they usually have x8 different thread profiles on them
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  Zeeltronic system.
  • frazer.c  

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  Will be interested to hear how you get on with the new ignition system as next year I'd consider one of these for my WR200 as the CDI's are getting thin on the ground now
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  Anyone know what this is called?
  • jakeyboy  

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  I may have one, stripped all the starter motor parts off my engine. Can have a look if you want?
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  Oil from Crankcase breather and won't rev out
  • Barrelman  

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  Reassemble is simply the reverse of the disassembly procedure. That's a gem from Haynes and about ad helpful ad an ashtray on a motorcycle
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  DT 125 Cylinder head and piston rings questions
  • Glynn123  

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  @Glynn123 You said in my other post about me porting your cylinder, I advise you to send me the head aswell to get it machined to spec and derestrict it, as for rings, can't beat yamaha original ones for stock yamaha piston.
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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 jetting athina 170 • • 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!