Hi, I let my '96 CBR1000F sit for about a month in Las Vegas without treating the fuel and now the motor stumbles above 6000 rpm. It still runs perfectly on the low end. I was figuring there might be hi-speed jets that got gummed up. Does that sound right? I'm a pretty good week-end mechanic, but I've never done much work on carbs. I wouldn't hesitate to try it myself unless someone has a good reason for me not to. Thanks,
Tom

 

Have you drained out the old fuel?. Anyhew, bikes that sit for a long time in areas with high & low temps (hot days, cooler nights) can build up moisture in the tank from condensation, this can get sucked down into the carbies which in turn makes your bike run like a pig. Gumming up can happen, but why don't you put an additive into your fuel system to flush it out 1st.

 

I rode the bike from Las Vegas to Albuquerque, so it's definitely not the fuel. I haven't tried an additive. I guess I should before going to the next step. I figured 9 hours straight on the highway would clear out any cobwebs.

 

Sounds like you might be on to something with the high speed jet. I don't really have a whole lot a faith in the fuel additive cleaner. I'd take the air box off and spray the carbs with some carb cleaner. If they are like my 94 600's the jets are pretty much right there and you don't need to pull the rack to get to them. If that doesn't work you'll probably end up pulling them and doing a full carb cleaning job. Personally, I would just do that first instead of messing around. But I'm rather **** about that stuff.

good luck

 

I'm not too familar with a CBR 1000 F but it could be an air leak. On the F3, there is a low and high speed air intake. There is an air leak in the high speed... you'll have poor performance as a result.

 

Good stuff- thanks fellas! I'll let you know...