FJR Owners Forum banner
  • Hey Everyone! Enter your bike HERE to be a part of this months Bike of the Month Challenge!
1 - 20 of 123 Posts

·
Registered
Joined
·
122 Posts
20valves said:
I go for our middle grade, 89. No worries. Have used 87 in a pinch on the old one and never heard a knock or ping or felt one pony missing so I don't know how much it matters.
I would imagine that cylinder pinging would be a non issue on a EFI machine since the EFI would adjust automatically to match the fuel type being used?
 

·
Registered
Joined
·
7,478 Posts
JamesK said:
I would imagine that cylinder pinging would be a non issue on a EFI machine since the EFI would adjust automatically to match the fuel type being used?
From what I understand, that is not the case with FI systems like the one in the FJR. Only more sophisticated automotive FI systems with knock sensors can compensate for pre-detonation.

My cage has a system like that. It alters a whole bunch of things, including ignition timing, to run the vehicle as lean as possible without knocking. Naturally, higher octane fuel will allow the system to run leaner and more aggressive ignition timing.

:)
 

·
Registered
Joined
·
191 Posts
Mid-grade out of habit. Before the days of dedicated hoses I generally found that the folks before me had pumped mid-grade more often than low or high, so I knew I was getting a full feed of the same octane.

Pretty lame...
 

·
Registered
Joined
·
15 Posts
After 30 years in the business of making gas ... the manual says 87 octane ('01 CBR929; '05 FJR) so that's what I use. NEVER a ping, missed beat or any reason not to believe the manufacturer. Guess what? In North America, we make good fuel.
 

·
Registered
Joined
·
405 Posts
Octane ratings

05 FJR ridden cross country, 11,000 on 87 with never a problem. I did not pump 86 octane, which is available in US in the Southwest, had never seen or heard of such a low number, so used mid-grade then (88). At almost $4/gal, I am not going to use anything that just pumps money out the pipes.
 
1 - 20 of 123 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top