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Thanks again for all your posts!! We haven't had the time to work on the bike for some time now, but I will get back with updates a.s.a.p!! We have checked for air leaks by spraying ether on the intake manifolds, but it didn't rev up.. Dirtdigger: We have measured the resistance of the...

We have replaced the coils, the cables, the caps, the sparks and the cdi's... its getting frustrating :banghead: How can it run when it fires so inconsistent? :shrug: we measured the pulser coils.. the ohms is off by 50-60 ohms.. the manual says +/- 30.. could that be the problem? I dont...

Im sad to say that there aren't much to write about.. We got the new cdi-boxes.. They didn't change much. The bike can idle, but when we put a timing light on the first spark cable it fires uneven. Like: blink, blink, blink, blink, pause, pause, blink.. :confused: When we put it on the second...

Allright.. We did some more searching and now we have ordered these CDI modules: http://www.davidsilverspares.co.uk/CB750C-CUSTOM-1980-USA/part_29244/ They are much cheaper :) Now we are looking forward to get them installed.. To be continued..

Thanks.. and you are right.. and we are having a good time doing it :) As I said we found out that the CDI boxes are broken. They are very expensive (310 dollars a piece) so we would like to know if anybody has a cheaper trick/idea to use something else.. maybe DIY or some other CDIs that can...

Alright.. A little update.. Now we had time to test some more and we found out that the ignition amplifier (guess its also is called CDI) may be broken. The Haynes manual says it should show 0 V and 12 V when performing the test, but they both are showing 1,7 V and 12 V.. When we testet the...

Thanks again! The news about the crank seal is making me happy.. one thing less to be concerned about.. I did try to pull the clutch but it didnt change the sound. Im sorry to say I havent had to time to go to my dad, so I have no news yet.. But I will be posting as soon as possible :)

Thanks guys!! Travis.. Im not sure exactly how much its leaking, but its too much! :( Is it possible to change to crank seal without spilling the cases? Im not were to bike is now, so I can go and look.. but can we "just" pull the seal and install a new one? Thats the first thing I think we...

Thanks :) He have had for some years now, but it hasn't been running good for a while.. We found out that the ignition coils were bad so we replaced them the day before the video. That night as I wrote it didn't sound like that tractor.. But you are properly right.. we should check those other...

Hello! I need help! My father's CB 750C has difficulties taking the gas.. It wont rev properly.. sputters and bangs .. Is it false air? Must we clean the carburetor? Ignition is pretty good, new coils and the timing is set OK.. but there is oil at the pulser generator coils.. should there be...