Page 1 of 1
honda cb750 k3 motor
Posted: Sat Nov 14, 2009 3:53 pm
by bambanice
I just got my motor running and after i let it run for a bit the exhaust coming from cylinders 1 and 2 are hot but 3 and four are not is there something i should check i know that cant be right. the way the coils are set up is one coil does 1 and 4 and other coil does 2 and three any help would b nice thanks.
Posted: Sat Nov 14, 2009 4:48 pm
by Wrider
Are your fuel lines to your carbs clear? I'm guessing it's a carb issue on the right side. Might want to check the balance screw in the middle that syncs the two right carbs with the two left carbs. Also check the idle screws on those.
Posted: Sun Nov 15, 2009 3:22 pm
by BuzZz
Could be a bad coil. Swap the leads from the running cylinders to the cold ones and see if the problem moves with the leads. If so, the one coil is bad.
Cleaning the carbs on any bike coming off a long dormancy is always a good idea.
CB750
Posted: Mon Nov 16, 2009 4:16 pm
by dayll
bambanice: go to the DOHC site; those guys will get you running good in no time. Lots of expertise there if you can handle the occasional sarcasm. dayll
Posted: Wed Nov 18, 2009 9:58 am
by PeterTrocewicz
Sounds like maybe the ignition coil isn't firing. if I remember correctly, #1&2 cylinders are fired by 1 coil, and #3&4 are fired by the other. It could be just that the coil's come unplugged. Sometimes, 1 bad sparkplug can stop the other from firing.