Hi. My cbr1000f runs on three on tickover, but runs fine with a little choke. Could the carbs need balancing. Ta!

 

Sounds like a clogged jet to me. Probly not a balance issue although once you`re down there it`s never a bad idea to do that as well.

 

Thanks. Can I clean the jets without removing the carbs?

 

You cannot. You need to remove the carb battery from the bike to gain access to the bowls below the carbs. You do not have to take the carbs apart from each other but you do need to remove them from the rubber boots to flip the battery upside down. If I recall correctly it can be done without removing the cables but not certain on that.

Note that the carbs can be very tight in the boots and probly will put up a fight before popping out, if the boots are deteriorated over time there is a slight chance they might rip so inspect them for any rips or other damage. If you are digging into the bike the first time it is always a good idea to take many photos of all the hoses and stuff so you`ll get everything right when you put it back together.

It`s not that big of a job, a seasoned wrencher can get away with it in an hour or two but since you`re learing your way down reserve the whole night so you don`t rush.

The fact that a jet LOOKS clean does not yet make it so, the impurities can be so small you don`t see them with a naked eye so it`s a good idea to unscrew the jets, soak them in carb cleaner and run a strain through them from an electric wire so you can "floss" the hole thoroughly. If you take all jets out at the same time remember which goes where as the ones in the sides are different than the ones in the middle two. And remember that prolonged exposure to carb cleaner spray will destroy rubber parts like seals, if you get some on them wipe it off and you`re good, but if you let them soak in it they will swell and get destroyed.

Hope this gets you started.

BTW for future reference it`s always a good idea to state what year model your bike is. Not required but if you also tell us where you live chances are there`s another member in helping range.

 

Hi Victor, done this job a couple of times myself, it's not that difficult.

Once everything is clear of the carbs (air box ect), I put a thin piece of wood between the cylinder head and the carbs and use a bar to lever them off gently, they'll pop right off.

Be sure to note where all the rubber tubes go, there are two long ones, which are just drain tubes. If you've never done the job before you can spend hours trying to figure out what they connect to! Matts' suggestion to take lots of photo's is a good one.

When refitting, I use a short length of 2"x2" or similar to push them back on.

When refitting, make sure the carbs and rubber boots are well lubricated so they can slide back in, work from side to side so they are properly aligned, otherwise things will not go back together properly.

Sounds more complicated than it is, any problems, don't hesitate to ask.

Lastly here's a link to workshop manuals and other useful stuff :-

Workshop Manuals - CBR Forum - Enthusiast forums for Honda CBR Owners

Good luck








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Many thanks to all. Some good advice. Looking at the carbs, I think access is the thing! I'll let you know how I do. Thanks again.

 

I got the carbs off, not too bad a job, and gave them a good clean. Numbers 1 & 2 had some dirt in the bowls. All back together now. Runs fine throughout the rev range except for tick over when it runs on 3. Any thoughts? It's a 1992 cbr1000f with 43k miles. Thanks.

 

Could be that they need to be balanced. If they are out of sync she will run lopsided. You won't know it with choke on or at acceleration.

 

Pilot jets and air needles were cleaned ?