Hi Everyone,

I'm new to biking and have just bought my first bike. I'm a few weeks of my test and can’t wait to start riding.

I bought a CBR 600 F3 1996. I got it at a great price from a work colleague, it was his first and last bike, children came along and he stopped riding, it’s been in his garage and not used for around 3 years.

Anyway, here is the problem. Cylinder 2 doesn't seem to be firing, I did the spray test on the manifold pipes and 1,3 and 4 evaporated the water almost instantly, but 2 it didn't. It smouldered a little and eventually went.

So here is what I have tried so far. I thought a plug may have been down after being stood all that time, so I swapped all the spark plugs for new iridium ngk's. The problem was still there. I've tried swapping the leads over on cylinders 2 and 3 as they run from the same coil pack on the left side of the bike. 1 and 4 run from the right coil pack. This also made no difference.

There was some old fuel in the tank, so I filled the tank with new fuel, this also has made no difference.

Other things I’ve done to the bike include replacing the air filter with a K&N filter, new Castrol 10/40 semi synthetic oil and a new oil filter.



One thing I have noticed is that a liquid is dripping from the exhaust joint, it’s a slip on Micron can. I’ve smelt it but can’t make out if it just condensation or partially burnt fuel.



The bike starts first time and sounds great to me, it was a friend that’s into bikes that said he didn’t think it sounded right for an inline 4 and said it sounded more like a 3 cylinder or v twin! That’s what made us first check the manifold pipes.



I’m not really sure where to go from here, any advice would be greatly appreciated.


Thanks everyone.

Rob.

 

Welcome Rob

Reckon the #2 carb pilot and or main jets might be gunked up man

 

Forgot to mention the bike has 37,00o miles on the clock.

Rob.

 

Rob, First thing is do a compression check on that cylinder to rule out a hard mechanical failure. Then, if all good with the motor, clean those carbs! #2 is probably all plugged up from sitting for 3 years.

 

Hi Sprock,

Thanks for the welcome and reply

Not sure what a carb pilot is, do you mean #2 and not #3?

What would be the procedure to diagnose and fix the problem with the jets/carb pilot?

 

Right 2 - take them off and clean- or have them cleaned - check tank for rusting and sediment

 

Hey demon,

I was going to try and pick up a compression tester tomorrow, apparently they can be had from the local bike shop for around £10.

I'll keep my finger crossed the engine is good, or my nice cheap bike wont be so cheap lol.

I'm going to try and find a Haynes manual too so I can clean the carbs.

Rob.

Sprock, I inspected the tank when I first got the bike, its really clean, no rust at all and no sediment.

 

Good plans Rob and resist the urge to blow the hell out of the carbs with compressed
air it can rip up the diaphragms in there - best to drain - disassemble and clean

 

just been reading a guide on this forum about cleaning the carbs on the f2, looks scary when you get to the floats and needles etc... is the F2 and F3 carbs the same, can i follow the guide?

 

All these carb fueled Honda inline 4's pretty much work the same way you are good to
go just keep your workspace clean