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UglierBoss

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  1. Hi all, long time no speak. I am reconditioning a second hand YBR engine and it does run. I suspect something isnt right with either the piston or the valves as its a bit tappy. I have taken the head apart and the valve springs are slightly different, but in the Haynes manual and the workshop manual they are supposed to be the same length. can anybody knowledgeable tell me which way round the valve springs go. one is slightly longer by about 5mm, and the other is slightly fatter by about 2 or 3mm. or perhaps I should just get new springs? Any help greatfully appreciated.
  2. Hi all, quick question if I may: My YBR has a noisy knocking engine and so I have a spare to swap with it missing only the alternator coil but it has the flywheel/magneto rotor. so I put the swap engine in and used my original coil and cover from the first engine. Im getting ok compression 80ish so i think the valves need cleaning up but I am also getting error 46 about power supply to Fuel injection. Can i assume the flywheel/magneto rotor on the swap engine is bad? I cant see what else has changed...
  3. Super thanks for your help. I have replaced the bleed nipple, put new seals in the caliper, installed a new braided line and changed the master over as mentioned above. Passed its MOT the other day and running fine.
  4. Thanks for the help guys, I have replaced the master cylinder so thats better. I think the caliper has a leak/crack because fluid isnt coming out the bleed nipple itself, but the thread of the nipple. I may have to replace the caliper. I have found one on ebay in italy but it looks worse than the one i have so probably not worth it. can I get a different caliper for this bike? maybe off a YBR or something, although its on the wrong side so i dont know. Once again, any help gratefully appreciated!
  5. Hi there so my ongoing project with the XTR has one thing left the front brake. When I got the bike the brake would build up pressure and then overnight would lose it again. I cant see any liquid dripping out of the caliper so i assumed that was ok and bought a master cylinder kit. Now my boy who the bike is for gets impatient and says let me take the bike into work and I'll get it fixed in my lunches. fast forward a month or two and it comes back to me with no work done at all but in the kit for the master cylinder there is now a ball bearing which I dont remember taking out of anywhere, is the ball a one way valve that I've overlooked. Ive checked the service manual and theres no balls anywhere. Ok so Ive put the new master cylinder in and i can get most of the air out of the system, but then the brake fluid comes out of the reservoir instead of moving the caliper. Parts for this bike are hard to find (discontinued) so could i replace the whole lot with a generic kit? Any help gratefully appreciated.
  6. Hi Blackhat, I dont suppose you could say why you think the SR is hardier? The only reason I am moving away from the SR is because I keep breaking valves and they are expensive and getting hard to find so I was hoping the YBR engine would be easier... Plus its seating position is so low that I find it uncomfortable.
  7. I just wanted to say hi and see if I could post photos of my bikes: https://app.photobucket.com/u/ma701apm/p/659406d1-bb50-4725-a186-59ee66ffc0ce no Idea if this'll work. I currently ride a SR125 but Im transitioning to a XT125R which I am led to believe has the YBR125 engine. I picked up the bike second hand and in parts and I now have a running bike, but I cant find any XT125R speedos so that will be a fun conversion. Nice to meet you all...
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