A forum for owners of Yamaha TTR250 trail and enduro bikes!

Jon, this link tells you all about "uncorking" the TTR:-

CLICKY THING

I'm sure that Brian will be interested in your 325 conversion, especially your proposed modus operandi. He's converted his and a friend's TTR and has had a few problems, mainly with oil retention.

Brian's currently on holiday but should be back soon.

Keep the reports and pictures flowing because we're all interested.

Martyn

ok read the threads and take the advice. the restrictor is gone this evening..

There is also this bulbus item attached to the carby intake hose. See pic..my mate says its like a pulsation dampener, supposed to smooth out intake pulsation? sounds like a sales line..

Anyone know if removing it affects the bike performance adversely ? Having it gone would make carby manipulation for jetting a whole lot easier.. ?

jon wrote:

---

ok read the threads and take the advice. the restrictor is gone this evening..

There is also this bulbus item attached to the carby intake hose. See pic..my mate says its like a pulsation dampener, supposed to smooth out intake pulsation? sounds like a sales line..

Anyone know if removing it affects the bike performance adversely ? Having it gone would make carby manipulation for jetting a whole lot easier.. ?

---

 I guess the only real way to tell would be to try it on a dyno but that isn't realistic. I am not sure that any change in performance would be noticed. Let us know the result if you try it!

Any progress on the casings etc?

Brian

Hi Greg, there is plenty of room in there. I stuffed the crank case full of rags first, then put the swarf collector in there, then filled with candle wax. I used a vacuum, when doing the milling. I used a vacuum when pulling the swarf collector out and rags out. Pretty sure i didnt get any cuttings in the crank case. Anyway after I got the bike going I checked the filter strainer every few hours of running. There was some fine metal material, not sure if this was from milling or just general running in of new piston and rings. Ive done 630km of hard riding now and everything is good. See other post about that trip. see pics of milling operation, can see my hand holding industrial vac hose.

I am getting a oil weep from hair line crack in cylinder jacket same as Brian got on his. Not a big deal but annoying if you dont like dust collecting on a oil weep.

If you get Thumper to instal the 325 sleeve, i would investigate with them if a slight bias to cam chain gallery and rear of cylinder. Seems the left side (Brian) and front (me) are suspectable to the hair line cracks.

Jon