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NEWB- Backfiring and bogging power

Old 04-13-2006, 08:35 AM
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BigVal
NEWB- Backfiring and bogging power

Greetings to all,

I just registered today. This is Great web site for new owners. (probably old owners as well!)

I have recently accuired a 1998 SH thru a local wholesale dealer auction. Unfortunatley I have no history of this bike or the prior owner. The bike now has 10k. She has Yoshimura RS-3 carbon fiber slip on's. At this point I am even unsure the prior owner installed a Jet kit for the carbs or aftermarket air filter.

Here are some symptons:
Idle is great. Choke assembly and choke operation is great.
Bike seems to run good when warmed up.

While accelerating very rapidly, then shut down the throttle rapidly, she seems to "load up" the carbs. If I try to reaccelerate rapidly she will bog then slowly build revs. Once the bike is above 5K on revs it appears that the condition subsides. Down shiftinf the bike sometimes causes the condition.

Upon deacceleration she pops and backfires from the pipe.


My actions for the weekend:
Remove the seat and tank to check all line and connections.
Check the air filter.
Possibly look for other mods the the PO may have done?

At this time I do not have any real common knowledge of what carb settings the bike should be at.

I ride anywhere from sea level to 2k.

If you gentlemen can assist me in a starting point for troubleshooting and possible settings of the carbs it would be greatly appreciated.
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Old 04-13-2006, 01:01 PM
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First impression is that your slides aren't opening as fast as they need to be. This would cause your mixture to run rich, and may explain your backfiring. This is a common symptom with aftermarket exhausts, i.e. the jetting isn't properly matched.

You may want to check the condition of your air filter element, and run some carb cleaner through your system to clean up any debris near the jets.

The bogging you are talking about sounds like it is originating from an improper fuel mixture at that range, probably because the slides aren't matching the fuel flow. The P.O. may very well have jetted the bike and not changed the slides. At idle and choked, you wouldn't ever be able to tell, but once you got off that circuit you would notice it (i.e. 3k to 6k). Do you know how to check for jetting?
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Old 04-13-2006, 01:20 PM
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Re: NEWB- Backfiring and bogging power

BigVal,

Welcome to the forum.
Careful with the "OLD" jokes.
Some of us are still in denial.

But not me.
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Old 04-14-2006, 06:14 AM
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Re: NEWB- Backfiring and bogging power

Hey Guys,

loco- Thanks for the input. My first thought was she is running rich. But I wanted a little insight from the forum. I have taken 3 rides and my gas mileage is around 27 mpg. That is really scary. I am not a throttle jockey. I will check all the normal troublshooting problem areas. I feel very comfortable checking the slide and jetting. At this time I do not have a manual so It might take a little longer. Do you know if anyone has a soft copy of the manual that we can download? Maybe you can let me know what the stock jetting settings are for the bike?

I searched the site for carb Tuning but did not have any luck.

Bird- I am holding on really tight to denial. :wink:
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Old 04-14-2006, 07:56 AM
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Old 04-24-2006, 11:27 AM
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Thank you very much for the online Manual.
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