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

Making gradual progress, mostly been stalled by other jobs around the house!

Got the bottom end fully assembled after a couple of schoolboy errors that necessitated some backwards steps.
1. Needed to helicoil a couple of generator cover bolts as the threads had been stripped.
2. Needed to re-remove the clutch cover and pressure plate to install the clutch arm, cos I put that in the RH side box so only got round to finding it at that point when I'd buttoned up both side covers! And then realised that I need to take the generator cover off again to get access to the shift arm locking bolt! Doh! (read the manual more thoroughly as it's mentioned in there of course!)

Trimmed the bottom gasket to fit, and then inserted the rings into the piston and the piston onto the barrel using my ring compressor to avoid any bloody fingers. Bit awkward getting the gudgeon pin clips in place in that position, but got there and the piston and barrel are now in place.

One question: the arrow on the piston should point forwards (exhaust side) I think yes?

-- Edited by Padowan on Sunday 20th of June 2021 04:37:08 PM

She lives!

After a bit of a delay in finding the time to work in the garage and then assembling the bike to find a leaky carb that needed some bits from Steve and then some careful sanding to seal the pumper cover, I got the carb back in, filled with fuel put a smidge of choke on and then gingerly hit the starter. Literally 1 turn over and she fired up into life. She's sounding a little less like the sewing machine she used to, a little more whiney perhaps, but I'll gently start to break in the engine and get an oil change in before casting any judgements on there being an issue.

Next job after that will be to start playing with the jetting, I'm running standard jets at present just to get her up and running, but will get some jets and start playing.

 

I actually have no idea what the pipe is, it was a lighter stainless one that Steve had knocking about that I said it take off his hands as there were no Motads about at the time. It sounds very nice, a bit louder than standard, but not rude. It does have an insert in at the end, so it's not as open as an FMF for example, I think its probably comparable to a Motad...

Finished assembling the bike too continue the break in with a gentle little around the block trying to keep the revs up and down and not bogging it down. I think the whine is a bit less, perhaps its just things bedding in.  @Simon, here's a pic of the end of my anonymous pipe, as you can see it's not super flowing.

-- Edited by Padowan on Thursday 12th of August 2021 08:38:41 PM