I just bought a 2005 sportster roadster last week and have been looking through a lot of posts since then. One I read that worked!! My bike was a little sluggish at idle and low rpm riding - also a little engine knocking. Ran my 83 octane out - filled up with 91 and it was amazing. It is like I got a tune up. HIGHLY RECOMEND THIS FOR ALL "NEWBIES" LIKE ME.

 

where in the heck did you find 83 octane

 

every station in town. lesson learned. went to 3 to find anything above 87

 

all i ever find around my area is 87-89-91. always run the highest octane at the place i stop at.but i am glad to hear it helped you out changeing to a higher octane level

 

haven't seen 83 anywhere around here ever,it's usually 87/89/91 or 93 or bothand I use the top grade available where ever I go[8D]

 

I use 93 all the time.

 

I use the top grade available, which around here, seems to be 91.

 

From the owners manual, 883 - 87 octane min. 1200 - 91 octane min. For 04 and up. I've seen 80 octane av gas but 83?????

 

Owner's Manual. That would help a lot. I ordered one 2 days after I got my bike. Still "in process" on the HD web site. Is ordering off of their site always slow?

 

Even the ethanol fuels are 85 octane.arent they???? isnt that what the E85 stands for?

wayne