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  1. Small end bearing cracked

    I'd done a complete piston kit last time, pin , bearing etc...
  2. Small end bearing cracked

    Yeah checked for hot spot under the piston- nothing, all clean. Vertex pistons come with a matt gray to black coating on the side walls, this is hardly worn off the old piston (I'm just changing it cos it's about time- it really hasn't done much work) Plug looked about right, light tan deposits...
  3. Small end bearing cracked

    Hi Darringer....no mic available sorry, got a good (analogue-Miyoto) verneer caliper though!! No I didn't mic the bore last time, I just fitted a new piston kit (piston, wrist pin, circlips) and a new SE bearing. The bike has had little use from new, and bore looks fine, although I appreciate...
  4. Small end bearing cracked

    Just in the middle of doing the top end on my son's RM125 O3, and when I removed the small end a couple of the needle rollers fell out of the cage. On closer inspection there are several cracks around the outer edge of the bearing (allowing the needles room to fall out). It hasn't been...
  5. Case Splitting newbie

    Reelrazor is right use heat/cool method. Some manufacturesrs are tighter than others for some reason KX's seem to have very tight cases, particularly the mini bikes.
  6. While the KX85 is in pieces?

    I wouldn't bother polishing, read plenty of threads on here that say its not worth it. The bike is pretty good stock, ours had a PC Pipe on it, but I don't think it makes much difference on the KX. I can vouch for the PV governer thing, it happened on ours, so read up on the subject, we...
  7. Case Splitting newbie

    On some bikes you can undo the centre clutch nut in the way you describe, on others you have to remove the pressure plate to access the nut, so using the penny in the gears method won't work as you have lost the grip between the plates. Depends on the model of bike though, I don't know YZ's
  8. Seat problems....

    Replacement seat tabs are made by several after market companies here in the UK, not sure of the brands though. Likely to be Acerbis, UFO etc..
  9. Case Splitting newbie

    My two penneth...in no particular order, and of the short rough and ready flavour... If you have to hit anything use a rubber or at least copper faced hammer Don't prize anything apart with a screwdrivers on mating surfaces Use the heat /cool expansion properties of materials to aid removal...
  10. sag won't set

    Make sure you do not have two collars that are locked together???
  11. Jetting- early warning of lean condition?

    OK thanks Chili, we too will be due for a re- ring soon, I will check for det. then. What were you seeing?, metal deposits/specking?, did you have the 'BLAAACK SPAAAAAT' (spot) underside the piston crown? etc...
  12. problem with brakes

    If you had leakage following the ding, then you will have to bleed the system (expel all the air). This is best done by reading the manual, if you don't have a manual then search on this site for 'bleeding' or similar. It's a bit fiddly first time, but will get you back and working as before...
  13. Cr125: Clymer manual, any good ?????

    Hmmm....Genuine manuals are often better in that they contain better a technical specification data, but the actual practical tear down/rebuild info is usually better in a Clymer, having been written from actual experience (at least that's what they claim). So if you are au fait with the work...
  14. float and jetting adjustments

    I have always found this adjustment tricky, and pretty meaningless actually. You are adjusting when the tang meets the valve, but this does not take into account friction, mechanical binds, variation in float bouyancy etc....when what you actually want to acheive is an known height of fuel in...
  15. Jetting- early warning of lean condition?

    Hmmm..thanks for the input Marcus and Chili. We have had no pb's at the setting I describe, am loath to go any leaner without evidence of previous experience at similar geo conditions so will be content to stick where we are. We have good perfromance, with no discernable damage/ wear/ ill affect...
  16. Tool share Tool share Tool share

    To set the scene I'm drunk...been a good night! and i suspect my natural conservationist leaning is kicking in but... So may threads in this forum relate to " how do I remove/repair/replace this particular part" I understand that some jobs require a purpose made tool, with the correct...
  17. Lower shock bearing failure

    Don't know about the technicalities, but boy on that paper plate sure looks good. A splash of chilli sauce and some chips(fries US) and salad and I reckon it's worn so thin I could eat and pass it thru unnoticed!
  18. Tiger Balm for Armpump?

    Without wishing to start a ...what's good for armpump? thread...have any of you tried using Tiger Balm on forearms before riding?, I have had it recommended and will give it a go, but anyone tried it before? If you don't know what it is (UK thing?) it's an ancient Chinese preparation , a mix...
  19. Jetting- early warning of lean condition?

    Having gradually jetted leaner and leaner on my son's 03 RM125, I am pretty close with 440 main, 37.5 pilot and second clip. Bike runs great with much increased crispness, repsonse and power, with no fouling or spooge. A huge difference from the way rich standard settings. As ever though it's...
  20. KX 250 fork guard guide removal - why?

    Maybe the upper guides get in the way of the 'starting devices' (wot a silly name!) that alot of riders use these days, you know the thing that locks the forks down until the first turn.
  21. Fly Wheel Replacement

    Were you aware the FW puller has a left hand thread on it?, so it threads into the FW counter clock wise. when it is fully threaded in tighten the centre bolt onto the end of the crank shaft which will pop off the FW. Also be aware the tool I am referring to is a specilist one just for the job...
  22. moisture in the flywheel side of the bike

    Riding through water will draw in water to the LH casing. The engine is hot, when suddenly cooled by the water it creates a vacuum and draws in water. It's almost an impossible battle to overcome this, but besides regular cleaning and WD40'ing in there, I have had most success by... Put in...
  23. KX100 wont idle

    On the KX100 there is a white plastic shroud around the bottom of the main jet, it also shrouds the idle jet. It is the last thing that goes in before you put the bottom of the float bowl back on, and the first thing that falls out when you take it off, (hence possible to fail to see how it...
  24. How to clean bearings???

    I re-read the post and realise the bearings are still in the swingarm,so a little more difficult than when you get them in a pot of solvent. I would suggest standing the swingarm ends in small pots of solvent?, allowing to soak and using the bottle brush progressively until they get clean. I...
  25. How to clean bearings???

    Lots of progressive washes with cleaner and cleaner suitable degreaser I use. Also a bottle brush type brush which will poke in between the needles.