I can't quite afford the stainless valves, what should I look at for the clearances for inlet and outlet for racing on standard valves & is there a difference between the L3 and L9 clearances & how do I tell which engine I have, is there a clue in the serial number stamped on the casings..
Also, there are two types of cam chain tensioner, is the later one better, and is it still better in an older engine ( i.e. will an L1 engine benefit from an L9 cam chain tensioner ?) & again, how do you tell which engine. Both my engines now have the later inlet rubbers for the ram airbox to fit correctly.
I'd really appreciate any help, especially as I have had 3 rebuilds due to dropped valves!
Incidentally, both my engines blew oil out of the oil seal behind the sprocket, has anyone else had this, and why does it happen?
It hurt when I fell off on my own oil!
There isn't a ridge in the casing to hold the oil seal in, it just pushes in and out. Could my problems be due to excessive crankcase pressure, my engines are mildly tunes with about 13.5 to 1 compression,standard bores, or do the seals always pop out if they are cold?
OOPS, that was 3 questions !
