Engine

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  Gearbox Bearings
  rebuild size code gearbox bearing • • Calum

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  Clutch push rod adjuster help
  • declan

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  @declan so I’ve adjusted it and to get the right bite point I have to have no slack in the cable and for the most part it functions perfect except for it still drags and I’d need to up the idle just a tad so it doesent die turned off and warm it pushes perfect in 1st gear with the clutch pulled in
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  Hydraulic Clutches
  • NINJA

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  Calum, totally agree!
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  Ignition Timing Problem - Won't Start
  dtre timing ignition timing ignition no spark • • 2Stroke4Smoke

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  @2stroke4smoke Glad you solved it. Generally there is no reason to worry about timing on a stock two stroke. Naturally if it's been modified...
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  Replacing Clutch DT 125R
  • JDFB88

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  Different needle bearings and gudgeon pins.
  • Irongamer727

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  Never really looked into it to be fair. The load on the gudgeon and small end probably is not that great when compared with the crank pin. I'd ensure you use the small end for that gudgeon. And never reuse gudgeon's and small ends, for their cost they are jut easy to renew.
• D

  Top End Tear Down, Inspection, Rebuild, 20,000
  • DTblue

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  @declan Spa Motorcycles Cheltenham will do it though. http://www.spamotorcycles-cheltenham.co.uk/
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  Cylinder questions
  • Irongamer727

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  @irongamer727 PJME.
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  Milky oil
  • declan

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  Yeah it's usually a sign of water contamination. Due to the localised pressurisation of the water pump, it's possible for coolant to leak into the gearbox, without the oil going into the coolant.
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  Carb part identification
  • Sgt Robuck 5

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  @declan no the whole aluminium bit snapped in half
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  New transmission oil turned black after one week?
  • vishanj

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  @declan @Irongamer727 thanks mates, will look into that
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  Motorcycle coolant.
  • dtluke

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  @irongamer727 well, tap water has minerals in it which will be deposited inside the coolant jackets as time goes. This can affect the cooling. Also iron parts may catch rust as well. You may have to flush your cooling system more frequently compared to using distilled water.
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  Cold start problems.
  • Sgt Robuck 5

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  @oldman Any help is amazing bro! will see how it is tomorrow and go over some of this stuff
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  Beautiful Lanza engine
  • DT125Noob

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  @dt125noob Ha, I never said RS 250 engine. RGV 250, TZR 250 or any other 250 twin I could get my hands hand. Even then, Rotax do a 250 lump that drops straight in. I just wish I put a little more thought into it. I'll enjoy having a classic 125 though no doubt. Yes please, lots of piccy's so we can admire the work!
• B

  Wr200 engine in dt frame?
  • Bananper

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  I have a wr200 exhaust on a dt125r Frame ,you need to modify a few things
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  Cutout acceptable?
  • Irongamer727

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  My wr200cc/dt125r hybrid engine runs with lid cut off. I ran it also with the 125 engine. You just need to jet accordingly.
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  Billet Head
  • NINJA

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  @ninja As a general rule of thumb, the greater the compression ratio the lower torque spread but the greater the peak power. I don't know the figures, but I'd look to go with a domed head.
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  2002 3MB cylinder bore size.
  • Sgt Robuck 5

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  All depends why reboring it, if the cylinder measures size you say then never been rebored. The cylinder on your year although called 56mm is actualy 55.95mm, if the cylinder is not damaged then just get it honed. If honing the cylinder then this piston is what you need. https://www.ebay.co.uk/itm/Yamaha-DTR125-DT125-R-DTR-125-56-25mm-Bore-Namura-Piston-Kit/292513505226?hash=item441b29dfca:g:jyEAAOSwwbdWQwnA Whatever size piston you buy whoever is reboring it will bore and hone to match what piston you supply. The best reboring is done by Karl at KPM as had them do a few and also by PJME. Karl charges £30 for a bore and hone with return postage at £10-16 postage depending on courier and insurance required. He will also fully port your cylinder for £100, just have to tell him what your after like more midrange etc or more mid and topend like a YZ. http://www.kpmotosolutions.com/
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  Installing clutch plates
  • Irongamer727

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  The DT has now undergone a kickstart conversion! Feels so cool!
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  Tiny coolant leak.
  • Sgt Robuck 5

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  @sgt-robuck-5 doesn't work like that. Air pushes coolant up in the expansion tank filling it and then spits out on the road. Then returns to normal once cool. Just open the radiator cap and bleed it, problem solved.