cb750k 1977
Hey guys my name is Byron .. I'm new here and I am doing my first project but in having some trouble for a few weeks. I don't work On the bike every day I only do it once a week
I bought this bike and it was running ok. Gas was coming out of the float bowl so I decided to clean the carbs. I took them apart and cleaned them. The only things I replaced were the plastic gasket for the float bowl and the gas stop needle. Installed everything on the bike again, the Bike turned on ( I only bench sync the carbs) and I drove it.
Sometimes it did not accelerate as normal when pushing the throttle. It was moving but not as it should. I rechecked the carbs and I adjust the mix screw to 1 and 1/2 from the sit in position. On all of them it seems that it fix it. My friend let me borrow his brothers motion pro carb sync and after it got warm up. I checked that the screws in the tool were out to prevent the engine to suck up the liquid. I try to calibrate the tool with carb #2 but it almost sucked the liquid.
So i decided to buy a vacuum gauge tool to sync the carbs thinking it would be safer but now the bike revs high on its own I can not even try to fix the gas/air mix screw to keep it at 1000 rpms because it revs high on its own. Watching Some YouTube videos i decided to test if it has a vacuum leak I sprayed some carb cleaner to the boot connecting carb #1 to the engine and there was no change on the idling but 30 seconds later I did the same thing again and the revs went high. I retested and the same carb and idling did not change.
I test the other intake boots and same thing happened, sometimes it was revving high sometimes it did not. so I'm not sure if there is a vacuum leak or not ??
A week later after I though maybe syncing the carbs will be the way to go. I warmed up the bike to sync the carbs. I was removing the air screw to connect the adapters for the carb syncing tool ( while the engine was running, idling was about 1000 rpms) and just as I was taking the screw off the idling went high to 3500 rpms. The Screw was still in. I waited for a few seconds but the idling did not change, only After i took the screw off the idling went down.. Then I installed the adapter for the sync tool and the idling went high again Any ideas why?? If I change the intake boots Would that resolve the issue ?? and the issue persists what would be the next step for me to take a look, replace or clean??
Thank you in advance
Hey guys my name is Byron .. I'm new here and I am doing my first project but in having some trouble for a few weeks. I don't work On the bike every day I only do it once a week
I bought this bike and it was running ok. Gas was coming out of the float bowl so I decided to clean the carbs. I took them apart and cleaned them. The only things I replaced were the plastic gasket for the float bowl and the gas stop needle. Installed everything on the bike again, the Bike turned on ( I only bench sync the carbs) and I drove it.
Sometimes it did not accelerate as normal when pushing the throttle. It was moving but not as it should. I rechecked the carbs and I adjust the mix screw to 1 and 1/2 from the sit in position. On all of them it seems that it fix it. My friend let me borrow his brothers motion pro carb sync and after it got warm up. I checked that the screws in the tool were out to prevent the engine to suck up the liquid. I try to calibrate the tool with carb #2 but it almost sucked the liquid.
So i decided to buy a vacuum gauge tool to sync the carbs thinking it would be safer but now the bike revs high on its own I can not even try to fix the gas/air mix screw to keep it at 1000 rpms because it revs high on its own. Watching Some YouTube videos i decided to test if it has a vacuum leak I sprayed some carb cleaner to the boot connecting carb #1 to the engine and there was no change on the idling but 30 seconds later I did the same thing again and the revs went high. I retested and the same carb and idling did not change.
I test the other intake boots and same thing happened, sometimes it was revving high sometimes it did not. so I'm not sure if there is a vacuum leak or not ??
A week later after I though maybe syncing the carbs will be the way to go. I warmed up the bike to sync the carbs. I was removing the air screw to connect the adapters for the carb syncing tool ( while the engine was running, idling was about 1000 rpms) and just as I was taking the screw off the idling went high to 3500 rpms. The Screw was still in. I waited for a few seconds but the idling did not change, only After i took the screw off the idling went down.. Then I installed the adapter for the sync tool and the idling went high again Any ideas why?? If I change the intake boots Would that resolve the issue ?? and the issue persists what would be the next step for me to take a look, replace or clean??
Thank you in advance