Q: Size Of Valve For 57mm Piston Of X1

[Ryelle61]

i'm sure sa mga IDOLS and MASTERS lang talaga ako neto makakapagtanong. kaya ayun. gumawa na ako ng thread. ROFL! 57mm ako pero stock valve. help help help

 

[blackfly26]

Up for this question, if i may add, how about the camshaft what stage would be best?
i've seen a BV cylinder head 27mm/23mm stock CH of Yamaha X1 just modified by LHK, i think...

 

[Ryelle61]

i think 22/26 will do just fine too. just a guess. stage 2 camshaft is good. im will soon look for UMA stage 2 camshaft.

 

[blackfly26]

I read a post from the other barrio, according to him that BV is best suited for 59mm & above bore size, below 59mm bore, stock head with long duration cams is good to go.
*long duration is the degree of the cams??? anyone can enlighten me please. thanks