1984 Honda aero, running issues...
Posted: Wed Jun 18, 2014 9:02 pm
I have been working on this scooter for a few weeks now. This being only my 2nd time working on a moped.
I now have an 1985 nb50 and an 1984 nb50.
As for a history on the scoot it was worked on previously by an individual that seemed to know less than I, so I am sure that will complicate things.
It came with a new carb (seems a bit different), the old carb (dirty), no fenders and no airbox...
It has however had the cdi upgraded already...
It runs, kinda. as it was when I got it - starts up fast, idles well, but when the throttle is applied it revs to the sky, forcing me to kill the engine (in fear or blowing it as there is no rev limit on the cdi). If i start the bike after this engine kill without turning the a/f screw all the way out it automatically high revs. So basically I would start the bike, throttle up, it would hang and continue to rev, I kill engine and have to back the a/f screw all the way back out. I also noticed that the bottom screw in this carb looks as if it has been over-tightened (the tip is flattened irregularly)
I adjusted the carb, inspected the needle and seat, learned a ton about carbs I never knew, cleaned both the new carb and the old carb, and alot more that didnt work.
If I install the old carb after cleaning it, the bike seems to idle fairly well... sometimes. Cant explain that. But if
I give it any gas it bogs and dies... I should note here that the scoot does not high rev or try to with the old carb.
I feel that i should clean the old carb again and to install an air filter for this thing to get the proper air ratio in the carb.
I have a regular cone type air filter I have been using, will that work or am I required to find the one for this bike?
Any suggestions on where to go from here?
UPDATE
I just took off the carb from my properly running 85, installed in onto the 84 with a bit of coaxing, and it fired right up (with the airbox of course)
I would like to use the original carb as I cannot identify the other one and it acts all crazy.
Am I right to believe all I need is a good cleaning?
I now have an 1985 nb50 and an 1984 nb50.
As for a history on the scoot it was worked on previously by an individual that seemed to know less than I, so I am sure that will complicate things.
It came with a new carb (seems a bit different), the old carb (dirty), no fenders and no airbox...
It has however had the cdi upgraded already...
It runs, kinda. as it was when I got it - starts up fast, idles well, but when the throttle is applied it revs to the sky, forcing me to kill the engine (in fear or blowing it as there is no rev limit on the cdi). If i start the bike after this engine kill without turning the a/f screw all the way out it automatically high revs. So basically I would start the bike, throttle up, it would hang and continue to rev, I kill engine and have to back the a/f screw all the way back out. I also noticed that the bottom screw in this carb looks as if it has been over-tightened (the tip is flattened irregularly)
I adjusted the carb, inspected the needle and seat, learned a ton about carbs I never knew, cleaned both the new carb and the old carb, and alot more that didnt work.
If I install the old carb after cleaning it, the bike seems to idle fairly well... sometimes. Cant explain that. But if
I give it any gas it bogs and dies... I should note here that the scoot does not high rev or try to with the old carb.
I feel that i should clean the old carb again and to install an air filter for this thing to get the proper air ratio in the carb.
I have a regular cone type air filter I have been using, will that work or am I required to find the one for this bike?
Any suggestions on where to go from here?
UPDATE
I just took off the carb from my properly running 85, installed in onto the 84 with a bit of coaxing, and it fired right up (with the airbox of course)
I would like to use the original carb as I cannot identify the other one and it acts all crazy.
Am I right to believe all I need is a good cleaning?