problem with one cylinder
#1
problem with one cylinder
I have a cbr600f4 with about 34,000 that has a problem with cylinder #2. I've used different coils and different spark plugs from other cylinders, and it continues to have problems with #2. When I remove the coil I get sparks on the sides of the coil but the motor runs the same if I completely remove the coil.
What should my next troubleshooting steps be?
What should my next troubleshooting steps be?
Last edited by fernnny; 09-07-2014 at 12:38 AM.
#4
You can do a compression test if you have the tools to do it. It'd probably be a good thing to check anyway. Still, at 36k, the valves could use a check/adjustment. Don't rule out a valve if the compression tests good. A loose valve wont show up as low compression.
As for the carb, a speck of crap in one of the jets can cause all sorts of running problems. Also, the need to be synced together and jetted properly to work right.
As for the carb, a speck of crap in one of the jets can cause all sorts of running problems. Also, the need to be synced together and jetted properly to work right.
#6
Here's one from here about checking them:
https://cbrforum.com/forum/how-mecha...r600f4-143035/
If you need to adjust them, look through some of the youtube links or dig deep into the how to section and look for a tutorial. Don't just look for F4 stuff as all of the F series bikes, early RRs, and even other makes are very similar.
https://cbrforum.com/forum/how-mecha...r600f4-143035/
If you need to adjust them, look through some of the youtube links or dig deep into the how to section and look for a tutorial. Don't just look for F4 stuff as all of the F series bikes, early RRs, and even other makes are very similar.
#7
I was able to check my valve clearance. It looks like my cylinder #1 needs some work. Cylinder #2 was giving me problems to begin with and it looks fine. The next thing ill be checking is my #2 carb and compression test.
I attached the measurements I got.
Is it safe to ride easy with a cam out of spec?
Can somebody also tell me which shims I should replace. Thanks
I attached the measurements I got.
Is it safe to ride easy with a cam out of spec?
Can somebody also tell me which shims I should replace. Thanks
#8
#1 exhaust is a little tight. Not too bad though. To determine which shim you need, you need to see what is in there now and go to a thinner shim. Probably the next size down.
#2 intake is a bit tight as well. I would give that one some more clearance too.
It's better to have the on the loose side rather than the tight side. A tight valve can burn and become a serious motor problem.
#2 intake is a bit tight as well. I would give that one some more clearance too.
It's better to have the on the loose side rather than the tight side. A tight valve can burn and become a serious motor problem.
#9
#1 exhaust is a little tight. Not too bad though. To determine which shim you need, you need to see what is in there now and go to a thinner shim. Probably the next size down.
#2 intake is a bit tight as well. I would give that one some more clearance too.
It's better to have the on the loose side rather than the tight side. A tight valve can burn and become a serious motor problem.
#2 intake is a bit tight as well. I would give that one some more clearance too.
It's better to have the on the loose side rather than the tight side. A tight valve can burn and become a serious motor problem.
You're about .001 inch out of spec on #1's exhaust. That's not a cause for immediate concern, but tight valves can cause a few issues.
Next is giving the carbs a good cleaning/sync.
And then if it's still an issue, you'll want to check compression.
#10
I was told that too much fuel into the carbs can cause these problems. I bought a low pressure fuel pump recently and this happened about 100 miles after. What else should I look for or change?