I bought my bike and it came with a vance and hines exhaust and is jetted. I forgot to ask if I needed to put a different octane gas in there or if it dosent matter. To be honost with you I dont even know what octane is supposed to go in there.

Its a 92 F2 with 8k miles on it. pretty.

 

nice to know that it is jetted properly. its a damn bitch to do

anyway, the highest octane you can get would be good
not like AVgas or anything like that, but just premuim gas should do.

 

Your F2 should run fine on mid-grade, most bike except some of the newer ones with higher compression done require premium Gas but it won't hurt anything except you pocketbook. By the way what color is it I use to have and F2 a while ago when they were new.

 

I'd go with the 91, or whatever is considered premium where you live.

 

I don't know, but it should say in your owners manual, or sometimes there's a sticker under the seat that says recommended octane, as well as tire pressures.

Honestly speaking, you shouldn't need to change the gas octane from filter/jetting/piping, assuming the jetting is correct and you haven't made any engine modifications. Problem is, a lot of people jet for the highest HP gains, and without doing a gas analysis, and end up slightly on the lean side.

So, it's up to you. There isn't anything horribly bad about running higher octane gas than what your engine needs, there could potentially be negative aspects of running lower octane gas. Gas is cheaper than engines. If you really want to know, then take it to a shop with a dyno and gas analyzer, throw in factory recommended gas, and have 'em make a run with it.

Edit:

One thing I'll point out, running higher octane gas isn't a "Fix" to a lean jetting, it just slows down your engine's demise


[Modified by project_mercy, 11:36 PM 2/3/2003]

 

Black and blue with the hot pink stripe, sounds kinda queer but its nice looking, oh and it has the factory white rims. I actually saw it in one of the scenes in bikerboyz.


[Modified by OnlyNod, 7:50 PM 2/3/2003]

 

The seat dosent come up, and I have no owners maual. I bought it from a hook up shop where I live.. They jetted it and gave me a print out of the dyno, 86.3 RWHP.

The only thing I noticed was that when i was at about 9/10RPM it bogged with a loss of power. It felt like when a car is misfiring. I didnt have much time to ride considering i have no tags or insurance, the bike wasnt warmed up either and i dont know what kind of gas is in it. Today was the first decent day in jersey for a long time so i wont know when i can check it again. Is it common for a jetted bike to loose power and regain it? Thanks.

 

Well, couple things, if the gas is old, you can't make any judgements until you get it all out. As for jetting, "Jetting a carb" doesn't involve a single adjustment. It involves a series of adjustments, including idle air mixture, pilot jets, main jets, float height, and needle position. Each of these adjustments effects a certain range in the RPM band (example, idle air mixture mostly effects idle-3k RPMs .. typically).

At the point when you get up above 7-8.5k (depending on the bike) the needle is open fully and you're just running full-bore through the main jets. If it's bogging, you might want to try leaning those down slightly. You might also make sure your carbs are synched. There's also a slim chance that one of your float heights is off and that carb is flooding.

I know that doesn't help you narrow it down much, but carb tunning, unfortunatly, isn't the simplest thing. Like I said, make sure the gas is good, that's simple, cheap, and easy to check.

 

Like he said, its hard to explain in words. you have to also look at your plug and see how its like.