Hudriwudri
XS650 Addict
@Liftedzuki
Uuurgh with what jack refered to i can only marginally assist as I have other ways of approaching the same target/goal.
Thinking now I could imagine measuring the inner diameter on the seat (yamaha usually likes very wide seats on the valves) that you might be almost there and just need to grind down a hint on the seats in order to arrive at the needed inner diameter, thus cutting just down on the outer circumference of the valve should be no issue in my book.
Tell you what, I think I have a original non touched head laying in my current stack of to be ported work of which I could measure the needed dimensions.
If you measure me as precise as possible (dial calipers a must!) the inner seat diameter on the seat I will see if I can help you a lil tomorrow doing some assumptions and calculations.
Sorry for my somewhat tardy reply but I'm not regularly in the forums for lack of time (family, studies and assorted competition porting work).
Btw from what I can tell, replacement valves are over here still wo any Prob's available although not for discount prices.
If they are OEM I did not investigate but usually there is quite good availability of xs parts in europe.
Kind regards
Christian
Uuurgh with what jack refered to i can only marginally assist as I have other ways of approaching the same target/goal.
Thinking now I could imagine measuring the inner diameter on the seat (yamaha usually likes very wide seats on the valves) that you might be almost there and just need to grind down a hint on the seats in order to arrive at the needed inner diameter, thus cutting just down on the outer circumference of the valve should be no issue in my book.
Tell you what, I think I have a original non touched head laying in my current stack of to be ported work of which I could measure the needed dimensions.
If you measure me as precise as possible (dial calipers a must!) the inner seat diameter on the seat I will see if I can help you a lil tomorrow doing some assumptions and calculations.
Sorry for my somewhat tardy reply but I'm not regularly in the forums for lack of time (family, studies and assorted competition porting work).
Btw from what I can tell, replacement valves are over here still wo any Prob's available although not for discount prices.
If they are OEM I did not investigate but usually there is quite good availability of xs parts in europe.
Kind regards
Christian