Valve seatings
Quote:
Originally Posted by tedmagnum
There are a few way to go about this and it all depends on how bad your cylinder is...
You might just get away with honing the bore if its just shiny in places. You need to measure the bore in a few different places to see how bad it is so don't go crazy just yet.
Yamaha sell piston rings for difference stages of overbore. Your dealer should be able to give you the specs for the rings.
What was the mileage ? Were you blowing oil before ???
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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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Some great quote about hard core travel that nobody has said yet.[/URL]
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