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jkv45 · November 22nd, 2017, 08:17 AM

I would say use the lowest octane you can get that doesn't contain ethanol.

Or you could try the Stabil additive designed to neutralize the effects of ethanol.

87 without ethanol will give you the best performance and economy in a stock Ninja 250 if you can get it.

I believe having excessive octane can lead to incomplete combustion and additional carbon build-up in the combustion chamber. It can also lead to hard starting in some engines.

In a carbed engine, gas with ethanol will produce a leaner mixture than gas without, so running ethanol-free gas can make a carbed engine run better (richer) if it hasn't been tuned.

November 22nd, 2017, 08:17 AM	#14
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	I would say use the lowest octane you can get that doesn't contain ethanol. Or you could try the Stabil additive designed to neutralize the effects of ethanol. 87 without ethanol will give you the best performance and economy in a stock Ninja 250 if you can get it. I believe having excessive octane can lead to incomplete combustion and additional carbon build-up in the combustion chamber. It can also lead to hard starting in some engines. In a carbed engine, gas with ethanol will produce a leaner mixture than gas without, so running ethanol-free gas can make a carbed engine run better (richer) if it hasn't been tuned.