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I just reassembled it and readjusted valve clearance best I could, new oil. I replaced the OEM automatic tensioner with a semi-auto one from Sinnis (with the spring and a ratchet). Run from standing for a week or so, it sounds worlds better but definitely sounds tired. At least it’s gone from a slapping sound to a chain-against-guide sound. May try the OEM again and see if it slaps again.
Got a new KMC cam chain and guides (as a kit with the tensioner) but no impetus/skill to strip down enough to replace without splitting the chain. If I go that far, I may as well go full nut and bolt engine rebuild.
2T 250... ugh. Now you have me dreaming.
pdlouche
You're not the only one, people love it. Perfect chip shop livery innit!
Sorry to hear about your 125. Maybe it's just something simple though, cam chains rattle a lot before they go wrong and tappets need adjustment pretty regularly. Sometimes it's better not to worry (says the guy who once dropped a valve on a twin and still rode it home).
Hopefully you'll get your licence before the summer ends but it's pretty cruel fate as you've braved the winter, you really were due a decent summer of riding.