hi guys -- ive just been lucky enough to buy a brand new mugen head for my crm250AR (( admins ex bike ))

i have the ecu, full exhaust, fork springs etc etc and now wish to fit the head -- can anyone give me any advice as to whether it will require re-jetting -- if so what sizes etc -- or is there such a thing as a mugen carb??

thanks dudes!!

yes there is a jet kit ,i only know this as i came across it on this site .if you look under modifications on the home page it lists all the mugen products

Normally fitting a different head will not need rejetting. The head will alter the compression/squish ratio. therefore make sure you use 97/98 ron octane fuel and/or octane booster. as the compression is increased the timing may need to be retarded ( or it may need advancing its a while since i did something like this).
hope this helps a little ?

nice one gents -- il get it stuck on and see!!

im not sure if you can alter timing though -- its all electronic i think??

but thanks anyway!

While on the subjuect of a mugen head, How much different are thay from a stock one? My mk 3 has apparently got a Mugen head but it doesnt look like an aftermarket head. Jon

ha -- its funny you say that! -- i still dont know if ive been fleeceed! -- there is no markings that i can see to say its mugen so good question.... how can you tell exactly???????????????/

cheers!

Managed to find this on the japanese yahoo aution site, its for an AR but there cant be that much between the AR and MK3. also looks alot like the stock head.
The part number is 12000-YE1-K000 from mugen, but still dont know what markings would be on the head itself, its not visible on the casting.