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  1. If you're doing the seals check the main bearings for play, not a huge job to replace them if you already have the top end off. Hopefully by now they will have been upgraded to the sealed bearings When you do the top end remove the head & barrel as a unit, no need to take the head off & will save you needing new o-rings Crank seals can be done with the motor assembled apart from the primary drive, bearings involve splitting the cases but it's not a big job. Personally I'd do everything at once then you know the condition of the motor & you're only talking 1 more gasket & 2 bearings. Doing the waterpump bearing, seals & checking shaft condition is also a smart job to do
  2. I doubt you'll be able to run a LED headlight from the 2 thin coils, they are what connect to the CDI so they won't be supplying constant power. The only testing I ever did on the CDI in my Suzuki ignition fitted to my 73 CZ380 Mx bike was substitution, testing the primary & pulsar coils are easy but I ended up ditching the system due to lack of spark that I couldn't find the cause of, I suspect a bad connection somewhere
  3. The big coil isn't needed, it's the lighting coil
  4. They're upside down, the flatter side is always down with the external spring at the top
  5. tony27


    Have heard that Gas Gas has a new bike due out for 2023
  6. You're in Tennessee so you're in the same state as the US's TY guru Bob Grinder at B & J Racing Contact Us (bjracing.com)
  7. That's the reason I ride the 250 which also has relocated pegs & modified top yoke to get the bars in a more modern position, a friend has a 175 Majesty that I find cramped, he's ridden my 250 & he is trying to duplicate the riding position down to spacing out the footpegs by around 25mm on 1 side & 50mm on the other which brings them out to modern widths & makes the bike feel more balanced
  8. Personally at 6 foot tall I'd say the TY175 will be too small for you
  9. Reprinted manuals for heaps of bikes are available from e-classicbike.com , I've had a couple of different manuals from him. Stephen is a twinshock trials rider here in New Zealand, have ridden against him a few times on his Ossa gripper This is his eBay store listing for the 250A YAMAHA Workshop Manual TY250 A TY250 1974 Service & Repair | eBay
  10. tony27

    ty250 piston

    Wossner do make a standard size piston, strangely enough TYtrials shows a 1st oversize for a 70.25mm bore then 2nd, 4th, 6th & 8th oversize, aftermarket pistons generally only come in 0.5mm steps so 2nd, 4th, 6th & 8th
  11. What I've done with both my Jarvis & the TY is use the Dellorto threaded adjuster which screws into the OKO carb top perfectly & a Sherco cable for a Keihin carb as I use a modern throttle, it does run a slightly different route to the standard carb due to the cable coming out on a curve rather than straight up. Hopefully we can find some time to build the new airbox over the next month or so & I can get some decent testing done
  12. Don't have it fitted yet as the plan is to make a more modern airbox with a short, straight connection to the carb but ran out of time to get it done before the 75th Kaikoura 3 day this weekend so I'm still running the standard carb with the modified airbox Looking forward to finishing everything up & getting some testing done in the next couple of months I've run a OKO on my Jarvis Replica for a large number of years, it's a nice carb that works far better than the original Dellorto down low & doesn't seem to overflow as much as Keihin PWKs do. Well worth the money as long as it's a genuine carb & not a chinese knockoff
  13. The installation instructions from mid-atlantic mention needing to soften the up the hose to make it fit the OKO carb, only modification needed to fit the new carb. The mikunis used on the TYs are unique to them, small float bowl & I think the airbox side is smaller than a generic new replacement mikuni measures. There isn't much clearance under the float bowl of the OKO but they fit straight in the cylinder side manifold so it's really only the airbox side that is different Your original hose will have shrunk as well as hardened with age, the clauss studios hose fits perfectly with the standard carb etc so I think it should be able to fit the OKO with the boiling water treatment
  14. It will probably be a good idea to get new airbox connector from clauss studios for the OKO carb, the bellmouth is bigger so you need to expand the rubber to fit & your original has probably gone hard with age & no amount of hot water will make it pliable enough to stretch to fit without splitting I have the 28mm for mine but the plan is to remake the airbox with a straight hose & modern air filter in the lid design to get rid of all the restrictions
  15. Can't remember what the number ended up being but they're on the the reed block in the 175 now. The 6TR108 look more correct, seem to come up as fitting Fantic on Italian sites
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