Quote:
Originally Posted by pete
thats a better looking piston but still a short skirt..
the WR250R has a long piston uses the same bore & stroke
as the WR250f but is only a 4 valve motor... don't think
you could machine a 5th valve pocket in the piston...
with the right valves / piston / compression ratio theres no
reason you couldn't make the motor last a lot longer.
I looked at the WR250R but they are a 2008 onwards model
and hold there prise... the WR250f takes a rekluse clutch..
edit.... just found this for a WR250F.. http://www.ebay.com/itm/350298522813...#ht_1134wt_932
full skirt 3 ring piston ... high compresion ,but a few base gaskets will sort that..
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Interesting.
I don't know what the YZ400F's piston looks like but it has a 5 valve head with stainless steel valves. I think Yamaha changed to titanium valves for the 426.