For a bike with the oil pump blocked off, what fuel to oil ratio do you use for premix? Is there a preferred 2 cycle or is Motul 2T okay as that is what I use in my Aprilia RS 125. New to the forum and to NSR 250's (1994 MC28)

Everybody will tell you to go 30/1, but I have run an MC21 on track for many years, as well as RS125 and RS250 at 40/1 with no problems at all, Silkolene comp 2 on the nsr and Castrol 747 on the RS's, but realy any good quality oil in the nsr should be fine.
_________________
Proud Father of , 05 ktm 400exc supermoto 2018 honda crf rx supermoto

Welcome to NSR-WORLD, "cincykid".

HRC spec 30:1, but as Les has said, they will indeed run with considerably less oil. Only use a fully synthetic 2T oil, especially if you are going to try and run less than the recommended 30:1, and try and stick to one brand. Motul 710 is probably the easiest to get in the USA.

Bear in mind that changing the fuel:oil ratio will also effect the jetting, and what works for one person/motor won't necessarily work for another! Hence why I won't personally quote any numbers! Also be aware that the fuel used by Les here in the UK could differ quite significantly in both octane rating and ethanol content, so I would say start at 30:1, and work down if you really feel it necessary.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!