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Originally Posted by XT GIRL
Only done about 500 miles since buying it - so problems were possibly inherited. Ran okay until head gasket went.
Used a digital caliper to measure round the cylinder and the difference is max 0.08mm. Not sure if thats critical?
Anyway - cylinder seems least of my problems.
Ground the valves just now (wow! didn't know one can have so much fun twirling sticks!), and discovered that both exhaust valve seatings are pretty crappy (very unevenly worn) which I'm told will need reseating?
I guess best thing is just to take the head and cylinder to a machine shop to have both checked out and fixed.
PLUS one of the inlet valves wouldn't come out smoothly... it gets stuck- seems like the valve stem is bent. (Cos I tried the other valve in the same hole, and it slid in and out easily)
Soooooo.. I'm going to cry for a little bit. Have some wine. And then tomorrow think about what to do next. (Have my hair done, I'm thinking).
If anyone has a spare valve floating about...
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With that discrepency, I would just hone the cylinder and if the cylinder is within standard spec, a new set of standard rings (about £25). Its probably just glaze on the bore.
You can hone your own cylinder if you have a powerdrill and a DIY hone but paying someone £12.50 is even better value, especially if you haven't done it before.
Cylinder Hone Set 4-in1 Sealey VS029
A test to see if your valve is seating is to reinstall them then pour WD40 into the exhaust and inlet ports and see if it dribbles out at all (best leave it 20 mins or so)..
I take it when you ground your valves you used 2-3 different grades of grinding paste ??? You should get them to seat properly with twiddling sticks.
As for the valves, some are easier to get in and out that others. Doesnt necessarily mean they're bent although its not hard to check with a straight edge. Maybe they just need decarbonised with some VERY FINE wet n' dry paper. As long as they slide easily when installed, it "should" be ok.
But... if you can't be arsed with it all (and who could blame you), getting a machine shop to clean your bore and seat your valves (with NEW SEALS) shouldnt be too expensive. £100 maybe.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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