98 900RR surging - Honda Motorcycles - FireBlades.org
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post #1 of 8 Old 09-09-2009, 3:38 PM Thread Starter
 
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98 900RR surging

My bike has developed a problem ever since I had it shipped to Italy. When I ride with the bike at steady throttle I get surging. Also when I roll on, there is a pause before the bike responds.

When I bought the bike, the carbs were in bad need of rebuilding. The bike sat for God knows how long, and fuel would just pour from the rotton seals. So, I rebuilt the carbs and cleaned/replaced all the jets. I then balanced the carbs and set the idle. All of this was done while in Utah, and I rode the bike for a whole year without problems.

When I shipped it over to Italy, I ran fuel stabalizer through the bike and then drained the tank and carbs.

This problem is intermittant. It is worse on some days, and sometimes is worse in higher gears. The only mods to the bike are a K&N filter, which is clean. I also double checked the fuel tank, filter straws, and fuel vacuum tap, and all look fine.

Any suggestions? I have a Dynojet kit to go into the bike but I don't know if this will fix the problem.
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post #2 of 8 Old 09-09-2009, 5:41 PM
 
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Re: 98 900RR surging

how different is the elevation from where you were to where you are?
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post #3 of 8 Old 09-10-2009, 4:36 AM Thread Starter
 
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Re: 98 900RR surging

That is what I was thinking too...

I went from 4500 feet to near sea level. I am thinking the K&N worked ok up in the thinner air, because it would let more air in and lean out a richening condition from being at a higher altitude. At sea level the filter may lean the mixture a tad too much.

What do you think?
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post #4 of 8 Old 09-10-2009, 8:47 AM
 
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Re: 98 900RR surging

most of what i hear says that the k&n filters flow less for our bikes, i have one installed right now but im planning to go back to oem, when you replaced the jets did you use oem? my guess would be your problems are due to the elevation change but carbs arent my specialty.
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post #5 of 8 Old 09-10-2009, 9:09 AM
 
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Re: 98 900RR surging

I shouldn't think a lean mix would cause surging though - sound more fuel supply issue like starvation/blockage.

I've ridden from sea level to over 3,000 meters (Spannish Sierra Nevada mountains, that's way above 4,500ft) without any issue.
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post #6 of 8 Old 09-10-2009, 9:11 AM
 
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Re: 98 900RR surging

my only other though would be a stuck float or something since it sat empty overseas
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post #7 of 8 Old 09-10-2009, 9:13 AM
 
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Re: 98 900RR surging

hows the fuel quality/octane rating where you are now?
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post #8 of 8 Old 09-10-2009, 9:57 AM Thread Starter
 
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Re: 98 900RR surging

Well, they say it is 95, but it is BLUE! I am using Agip fuel at the moment. Ducati used to go with Agip, but now they recommend Shell V-Power. I would think they know best about fuel quality in their own country.

I will yank the carbs apart when I put the jet kit in and give them a good cleaning again. Maybe that is all it needs.
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