CBR600F4 2000 - Problem Please Help - Going nuts here...

DJ1976 · 07-31-2009, 10:34 PM

Hi,

I am a noob to the site and would welcome any help.

I have a CBR600F4 that I bought a month or so back and it has soem issue I can't resolve.

The bike has sat for some time and starts rough and runs average while warming up.

It feels like it's running on 3 cylinders when warm, but when you roll the throttle on it's got no issues and goes like a bat out of hell.

I've cleaned the tank out, cleaned the in tank filter pickup, added a inline new fuel filter, cleaned the lines, had the carbies cleaned and balance and replaced the plugs. But still it feels $hit until you rev it up.

I am at a loss

, the bike is like new at only 9,000 klms, but has this issue and I'm buggered if I know what to do.

Do I need to pay the shop for a carbie re-build or is there something else I should try?

Any thoughts guys and gals?

Thanks Dallas....

cris_adder · 08-02-2009, 6:32 AM

Hi, one thing you may want to check is the strength of spark to each plug by comparing them to each other, it may be that one is weaker, which may cause the problem...

smokinjoe17 · 08-02-2009, 7:01 PM

It sounds like you need to have the carbs cleaned again. The reson that it runs bad on the bottom is that the pilot jet is clogged and starving one cylinder and runs good on the top end is that running on the main jet that is free and clear. Reclean the carbs and also check your oil leels to see if the bottom end has a build up of fuel in it. This will also cause poor running conditions

DJ1976 · 08-08-2009, 5:29 AM

Thanks Smokinjoe17 I'll do just that and post back how it goes, sounds about right seeings it has no issues when you roll on the throttle.

Cheers DJ

DJ1976 · 08-15-2009, 10:59 AM

Quote:

Originally Posted by smokinjoe17

It sounds like you need to have the carbs cleaned again. The reson that it runs bad on the bottom is that the pilot jet is clogged and starving one cylinder and runs good on the top end is that running on the main jet that is free and clear. Reclean the carbs and also check your oil leels to see if the bottom end has a build up of fuel in it. This will also cause poor running conditions

Just one thing, are the oil Leels the 4 small hoses that to the nipples on the botttom of the airbox?

DJ1976 · 10-20-2009, 1:16 AM

Well I cleaned the carbs. No change.

I have had the bike re-jetted and tested on the dyno - No change

It still shudders upto about 5,000 revs and then when you back off the throttle it feels like it's only running on 3.5 cylinders. It makes the ride rough and unlike a Honda.

Is there anthing electrical I can try?

An thinking I am just going to have to get rid of this thing, same it's in such good condition.

Any ideas?

kuroshio · 10-23-2009, 11:36 PM

Yeah, do diags on your charging system. Sounds like your R/R could be going