Is using Premium Fuel in my KLX250 worth it? Or will it actually damage my engine?

 

My dealer told me to use hi-test "91" in my 2012 KLX 250s and also my old 2006 KLX 250s.

From spec sheet:
Fuel Min 91 Research/87 Avg. Oct. Unleaded OK
Coolant 50% distilled water /50% ethylene glycol base antifreeze.



Stashu

 

I do alway use premium fuel on my KLX. Top grade gas will help to keep engine cool and much cleaner than regular gas.

 

One more time:

"PREMIUM" fuel does not mean it is of the highest quality. There are MANY fuels labeled "Regular unleaded" that are far superior in QUALITY to MANY fuels labeled "Premium". "Premium" is NOT a quality rating.

The ONLY reason to use a Research-Octane rating higher than the compression ratio dictates in a given engine is if the fuel delivery/spark timing system of a particular engine can take advantage of such fuel, OR, to TEMPORARILY prevent some kinds of pre-detonation as those caused by hot carbon tendril deposits. Carburated thumpers are not capable of utilizing any benefits of higher Octane fuels, unless the compression ratio dictates the need to use such fuel.

OTHERWISE, you are just wasting money, and MAY be sacrificing good fuel quality in order to buy often-times inferior quality fuels with the misleading label of Premium.

 

This engine already runs hot in stock condition, turning the header blue riding normally. The original valve cover gasket shrank when checking the valve clearance, requiring a new one before buttoning up the top end. That and the raised compression ratio of the big bore kit over the oem displacement. The extra .60 cents (.20 cents per gallon) seems like a good idea to help lower operating temps.

 

lol so your header was blue with heat?? jesus so much for liquid cooled...

 

Ill take that into consideration, thanks.

 

Seems it has more of an effect than im lead to believe.

 

My 2009 manual says 87 (RON+MON/2)

 

I read somewhere that KLX's were made to run on regular so that's what I put in in. I always try to go to Chevron or shell to get good quality gas. Should I be running Premium?