CB7shwifty
CB750 New member
Hi all,
This is my first post and my first bike. I purchased and 81 CB750C a few months ago and am learning as I go. When I bought the bike the seller was able to get it to run with a spray of starter fluid into the carbs and connecting a battery charger (old, dead battery). I just finished rebuilding the carbs, replacing the needle, needle jet, primary and slow jets, pilot needles, and primary nozzles using and eBay kit.
All of the primary nozzles were stuck and I messed up the first one by stripping the notch so I resorted to drilling them out and using a torx wrench to get a better grip. Two of the pilot screw tips were broken off in the seat. I was able to press them out using a bent dental pick through the tiny hole in the bore. The accelerator pump check valve was also frozen. I was able to free it up with an hour in the ultrasonic with some simple green. I also ditched the SOS.
Anyway, I finally put it back in the bike and got her started! While that was exciting, the idle sucked. It was running at very high rom (around 3k) with the choke fully closed? (I have a hard time with this terminology but the choke was actuated, or pulled out). It would run high for about a minute and then the rpms would start to fall and it would die within 20 seconds or so.
I wasn't able to get it to run without the choke. I have not yet tried to sync the pilot screws yet, but from what I understand it needs to be warmed up and idling without he choke for me to do that.
I'm not quite sure what my next step should be. Messing with the idle adjustment screw didn't seem to help much to get the rpms down. After I had it running for a few minutes, it died and then wouldn't start for several minutes. I had a hard time getting the carbs to seat in the old, hard carb holders. I gave the front of the carbs with PB Blaster Multipurpose, wiggled them in a little further, and was able to start it again with the above mentioned issues.
I would appreciate any insight you all can give to help me get her running smoothly!
Thanks,
Patrick
This is my first post and my first bike. I purchased and 81 CB750C a few months ago and am learning as I go. When I bought the bike the seller was able to get it to run with a spray of starter fluid into the carbs and connecting a battery charger (old, dead battery). I just finished rebuilding the carbs, replacing the needle, needle jet, primary and slow jets, pilot needles, and primary nozzles using and eBay kit.
All of the primary nozzles were stuck and I messed up the first one by stripping the notch so I resorted to drilling them out and using a torx wrench to get a better grip. Two of the pilot screw tips were broken off in the seat. I was able to press them out using a bent dental pick through the tiny hole in the bore. The accelerator pump check valve was also frozen. I was able to free it up with an hour in the ultrasonic with some simple green. I also ditched the SOS.
Anyway, I finally put it back in the bike and got her started! While that was exciting, the idle sucked. It was running at very high rom (around 3k) with the choke fully closed? (I have a hard time with this terminology but the choke was actuated, or pulled out). It would run high for about a minute and then the rpms would start to fall and it would die within 20 seconds or so.
I wasn't able to get it to run without the choke. I have not yet tried to sync the pilot screws yet, but from what I understand it needs to be warmed up and idling without he choke for me to do that.
I'm not quite sure what my next step should be. Messing with the idle adjustment screw didn't seem to help much to get the rpms down. After I had it running for a few minutes, it died and then wouldn't start for several minutes. I had a hard time getting the carbs to seat in the old, hard carb holders. I gave the front of the carbs with PB Blaster Multipurpose, wiggled them in a little further, and was able to start it again with the above mentioned issues.
I would appreciate any insight you all can give to help me get her running smoothly!
Thanks,
Patrick