Hi, I'm looking for some advice please:

I think I have a blocked injector on my CBR. There is really shaky acceleration up to 4000rpm, then the bike rides fine.

How easy is it to access the injectors to see their state? Is it a job for a novice?

Thanks

 

Not likely injectors since cloggy one would limit spray at all RPMs.

And limited flow would mean it works fine at lower RPMs, and gets worse in upper RPM where more petrol is needed. Yours behave opposite of what clogged injectors would do.

Test them yourself.

What volume do they flow in 10s @ 50psi?
Do they all flow same amounts within 10% range?

Follow service-manual procedures for testing MAP and TPS circuits. This is most likely wiring or vacuum-hose issue.

 

You'd probably have better luck if you posted this problem in the CBR 600 F4i section.

 

The joys of a not so common designation for the bikes
In the UK a 2002 F4i is a CBR 600 F2 (banana seat) or FS 2 (twin seat) versions.
The earlier versions all has a letter to donate the year e.g. FW 1998 FY 1999 etc.

 

Perhaps a mod can move this thread?

 

Done