Engine

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  Gearbox Bearings
  rebuild size bearing code gearbox • • Calum  

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  Super Smoke!...
  • SpookDog  

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  @Stevie-Wonder yeah that goes for all 2 strokes the oil doesent burn efficiently at lower temps so you need to clear their throats when they do warm up
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  DT125R fuel out of the overflow
  • gibboharps  

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  I’ve had similar temperamental problems with this (& a 100 other things!!) The only thing it can be is the needle valve that is operated by the floats (or the floats themselves!)old fuel varnish or dirt is the usual suspect... You can get a replacement kit I think. The needle and the brass insert it fits into... A good inspection and clean is usually good enough... P.S. the ‘weight’ of fuel can exasperate the situation, or it has in my experience (which isn’t much!)...
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  Dies out when I give gas
  • Haako Smith  

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  @SpookDog Have drained the carb multiple times, No water and stuff
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  Engine blown up
  • Thomas_Chr  

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  @SpookDog meant to quote Declan there pal. With the athena kit it's a complete unknown quantity. Only issue I've experienced with running a colder plug ( a10 range on nsr125) was it would foul and cause a missfire when the weather turned cooler.
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  Exhaust blowby, engine wall damage
  • crosserke  

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  @Calum yeah
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  Oil pump?
  • SpookDog  

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  3bn 1988 model.
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  Makita Piston
  • SpookDog  

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  Cheers bud, that’s something to work with. I’ve got a good 3bn, my reworked 3mb and another 3mb (that I forgot about till now) that is battle~scarred but otherwise original.
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  Dt 125r dyno
  • jonne123  

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  @jonne123 I bought the usb/laptop lead when I bought my zeel. Very easy to use once you have it installed.
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  Carb to filter rubber
  • SpookDog  

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  Yamaha just refer to both of them as Air Chamber on the parts diagram's - I still say its not a performance item and its just a bolt on for emissions / silencing etc.
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  Head leak
  • Haako Smith  

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  Thanks for all the respons. I did skim the head, but i will try to tighten the bolts
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  Ypvs servo motor
  • Arild  

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  I was told, time spent fine tuning powervalve timings is worth its weight in gold. In my opinion, this all depends on the usage. For road racing, a finely tuned opening wouldn't net huge gains. Since once you are fully opened, you are likely to stay that way. I.E. does the Honda RS125 even have a powervalve? Or is it just chocked wide open. MX a working powervalve is important, but there is always the gear below? I know people faff around with springs to get that powervalve open earlier/later but often it's just about shifting the timing. I was told by a local technician at Yamaha that tuning the valves timing will net you decent gains. I was always too lazy to actually do any of this.
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  Athena 170cc questions
  • Irongamer727  

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  @jackreece show a picture with your tm32 installed. The float bowl needs to be pretty level. Because of how the DT engine and intake is, some carbs will sit at a angle
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  The worst dt engine on ebay
  • declan  

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  @Challenger yeah I really wanted it to either be the graphite colour or just the standard silver but it’s all the paint I had or could get during lockdown so is what it is
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  What piston?
  • SpookDog  

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  Yamaha TZR125 DTR TDR 125 Wiseco Piston Stock 56mm Bore 679M05600 on ebay aint bad at all either they range .5mm and have 8 stages u have to have a rehone though to be sure u aint blowing your funds
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  Powervalve YPVS
  • Stevie Wonder  

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  2T oil feed
  • SpookDog  

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  Also, does the block breather pipe connect to the carb just behind the fuel in pipe? Cheers peeps!...
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  Power valve o rings?
  • SpookDog  

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  Hey! You weren’t wrong, there is a paper gasket. I was wrong about the oring though. It’s to big for the coolant pipe
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  Clutch conical spring washer
  • SpookDog  

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  What one are you on about? https://www.fowlersparts.co.uk/parts/4189513/dt125re-1d02-2005-030-a/clutch Can you not just use something like this? https://www.toolstation.com/spring-washer/p83526
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  Gear lever oil seal
  • jonne123  

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  Just done the one on my 3SH - when you put the new one in make sure that you cover the gear lever shaft with tape so it does not damage the seal when you push it through. Budget for a new clutch cover gasket and oil as well. BTW do not lose the clutch ball bearing!