Stumble on throttle up

[t3rmin]

No, it was the right carb vent hose (sorry for the bad terminology on my last post) ....so if that works the was i think it does, that means exhaust was backing up and occasionally "burping" past the kink when the pressure built up, allowing me to eventually accelerate?

Not really how it works -- the vent hoses just open the bowls to atmosphere so that gas is able displace air in the bowls as they fill. It would never build appreciable pressure. It would starve two of four bowls of gas under hard/sustained acceleration (assuming a partial kink).

[Guest]

Don't laugh but I just had the same problem...along with an idle that went higher the longer I rode. My problem seem to have been bad gas. I was running Sunoco 93 from the station near my house for the longest time. I switched to the 93 at the Get Go a few blocks away and the problems went away. I'm guessing it was just bad gas.

[Steve]

My problem seem to have been bad gas. I was running Sunoco 93 from the station near my house for the longest time. I switched to the 93 at the Get Go a few blocks away and the problems went away. I'm guessing it was just bad gas.

In my humble opinion, you are still using "bad" gas. Not because of the brand, but the octane. :shock:

Unless your bike has been built-up with higher compression, etc., you most likely don't need high octane gas.
Octane does not equal power. Octane merely reduces the chance that heat from compression will set off the mixture before the spark. With stock engines you will burn cleaner and get more power and spend a LOT less money by using regular gas.


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[CA180]

^ I second that. Improper octane does nothing for performance.

[Dave8338]

^ I second that. Improper octane does nothing for performance.

Only cures pre-ignition on highly advanced ignition and /or high compression. Alcohol will do the same thing, though you must be set up to run it. \\/ Nothing like the smell of a stiff drink, coming from the exhaust. 8-[

[bwringer]

I think the original poster mentioned advanced engine timing, so high octane may be required in this special case.

But yeah, most stock or mildy modified GS models are happiest with plain old 87 octane. It's cheaper, too!

[Guest]

I always thought that aluminum engines had to run on higher octane gas.

[Steve]

I think the original poster mentioned advanced engine timing, so high octane may be required in this special case.

Ya know what?
I just went back and re-read the orignal post. Not only did he mention advanced timing, he's got cams in there, too. :shock:
In his case, premium might be the correct fuel.

I always thought that aluminum engines had to run on higher octane gas.

Maybe only because the aluminum engines you knew were higher performance? Or maybe because their owners only 'wanted the best for my baby'?

Too many people simply see that high performance vehicles require premium fuel and assume that it's the fuel that give the extra power. Not so. It's the slower-to-burn and harder-to-light fuel that allows them to use the higher compression that gives the power.


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[Guest]

I run high octane, but I'm allowed. \\/