Fuel octane for 250R's
#1
#4
Fuel octane for 250R's
The powervalve changes your exhaust port size. Octane is required to run higher compression and avoid pre-detonation. Compression is what will require you to run high octane, not a power-valve. That said, I would think you could run 92 octane pump gas no-problem (unless you are running a thin head gasket or cool-head with high compression).
#6
Fuel octane for 250R's
more than likely, if you are buying this motor the builder did incorporate a thiner head gasket, aftermarket dome or some other method of making the bike faster. dont buy the horse if cant afford to feed it right. [img]i/expressions/face-icon-small-smile.gif[/img] i run a 50/50 mix of VP 110 and premium 91 (CA). It's nothing compared to the gas my truck consumes to and from the desert. [img]i/expressions/face-icon-small-smile.gif[/img]
#7
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#9
Fuel octane for 250R's
Well it is not just the motor I am buying it is the bike. I was wrong about the powervalve, but it is a 265 National Curtis Sparks and it does have a cool dome. All we have here is the 87 octane. DOes anybody think that the 87 octane plus some octane boost will be ok??
#10
Fuel octane for 250R's
heres my 2 cents,do a compression test on the bike...get a psi number.then find out which dome is in it.if its the 21 or 22 cc dome,your fu@ked, if not its the smaller dome you can always run the bigger to lower compression.87 octane is pretty low...compression better be around160-170 to run that in my opinion.mine kicks at 188 and i run 94 ,which i think is pretty close to being right.going by the builder metioned,im thinking its going to be pretty stout and around 190 or up.i bet it rips! feel free to ask ? if necessary,we are here to help.......... ps: octane booster is the biggest scam going(research it)"raises octane 2 full points",what that means is 2/10 of a number.eg:94 octane becomes 94.2=waste of money!if you need more octane research homebrewed octane boosters..toulene,etc. but be carefull some of this stuff is fu@kin dangerous(face shield,rubber gloves,etc) im out[img]i/expressions/face-icon-small-happy.gif[/img]