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Quick update: Finally got the time to clean everything up.. Both the valve seats and faces came up amazingly and i'm quietly confident that is the problem with the compression loss. I measured the piston end ring gaps and only 2nd ring was .05mm out of spec (wide). Piston skirt is in...

Check page 2 for pics of the valves. I would personally say a fair bit? I honestly think this build up might be the reason for the compression loss.. I've got the valves sitting in a tub of engine degreaser tonight so I'll have a crack at cleaning them up tomorrow then put the bike back...

Continued

So I've pulled the valves out and had a look. There's a little bit of side to side movement in the valve guide. Do you think the amount of carbon built up around the valve head and seat could be causing the compression loss? what do you guys use to break down and clean it? Brake cleaner/contact...

s.hit I wasn't aware you couldn't lap titanium valves.. How do you go about reseating valves in these bikes without forking out for a new set? I've been wanting to sell this bike for a while now to get a registered wr or something so I'm not looking to spend massive bucks here Sent from my...

Thanks mate, I'll go over all that tonight if I have time otherwise tomorrow. I'll have to check the receipt but there was definitely valve work done (whether they were replaced or just lapped I'll have to double check) But I'm starting to suspect some sort of foul play. Still figuring it out...

Can you hone a cylinder without having to change piston rings? Since the bike has been in my possession I've never thrashed it out. I got a receipt from the fella listing $1500 in parts and labour for a top end, honing was on the list. It was in the shop from May till September last year from...

It is infact a yz250f and I always keep the foam filter well oiled and in place. I was under the impression these cylinders had that nikacil coating so I kinda wanted to avoid honing if possible. I don't remember feeling any bumps when I rubbed my finger along it last time but I'll have a more...

Hi guys, I think this is in the right section, please excuse if it's not. I'm still learning the ropes and I wasn't sure if this amount of scoring is something to be worried about? I'm kinda getting the worst of it in these pics, everywhere else seems quite nice in comparison. the crap...