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General Category >> Rubber Side Down! >> Carbutor vacuum leak or fuel mixture issue
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Message started by John C on 07/18/12 at 09:42:15

Title: Carbutor vacuum leak or fuel mixture issue
Post by John C on 07/18/12 at 09:42:15

I did the spacer mod to my bike, got everything back together. screwed the fuel mixture screw in all the way, backed it out 2 3/4 turn. Idles well. My problem now is that unless I give it a "goose", when I just gradually accelerate (with clutch in), it is acting like it wants more gas...almost like its going to on me. Is that an issue where the carb isn't seated into the boots correctly, or is it a fuel mixture issue (or something else)?

Thanks in advance to all.

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Title: Re: Carbutor vacuum leak or fuel mixture issue
Post by verslagen1 on 07/18/12 at 11:28:40

sounds like you didn't get the carb back together correctly.
rinse, lather, repeat.

Title: Re: Carbutor vacuum leak or fuel mixture issue
Post by Routy on 07/18/12 at 15:22:38

Quote:
I did the spacer mod to my bike,
-----------------------------------------
Why ?
Did you have a good reason ?
What did it run like before ?

Title: Re: Carbutor vacuum leak or fuel mixture issue
Post by John on 07/18/12 at 18:22:36

Routy,

It backfired quite a bit when decelerating and downshifting. It is my understanding that the "spacer mod" would fix that. Now I have other problems....

Thoughts?

Title: Re: Carbutor vacuum leak or fuel mixture issue
Post by justin_o_guy2 on 07/19/12 at 02:35:47

Sticking slide?

Title: Re: Carbutor vacuum leak or fuel mixture issue
Post by Routy on 07/19/12 at 08:13:41

727B7777732D2B28180 wrote:

Routy,

It backfired quite a bit when decelerating and downshifting. It is my understanding that the "spacer mod" would fix that. Now I have other problems....

Thoughts?

Despite what you mite have read here, IMO, there is no fix for backfiring on decel or shutdown,....not that it can't be lessened a bit by the air and throttle stop adjustment on the carb. Many here have hacked carbs strictly to try to stop the backfiring, and many have not only failed, but ended up w/ more problems than just backfiring.

I did the spacer mod on mine only because I has a lean (surging) condition in the low to midrange throttle position,.....and it fixed that near perfectly. If you didn't have any problem in that range, you are possibly running rich there now, which may or may not be causing a problem now.
I can assure you that the mod didn't change the backfiring one bit, nor did I expect it would. And I have read of some that did the spacer mod, then reversed it back later.

Title: Re: Carbutor vacuum leak or fuel mixture issue
Post by Arnold on 07/19/12 at 09:04:34

Time to look at the plug...