Hello folks,
I can not get my BVS153/Vantage engine to run smoothly.
It not that it revs up and down and such governor issues, it's more like constant smaller misfires and non consistent running. No matter low or high throttle, it always has that issue. It doesn't bog down when under load, or anything. Also, what I noted is that when I give it more throttle, but in a quick manner, it would over-rev and then drop down to the normal speed (not sure if it matters, but I never had that issue before).
Carb is an adjustable Dellorto type, but it originally came with a non-adjustable one, both mixture-wise and thrrotle-wise. Never could get it to run with the orignal carb as it was full of something as it stood for a long time.
I did try adjusting it, finding the perfect spot but it has no meaning whatsoever, as going too high or too low just makes it bog or run very badly, so the mixture screw doesn't do much here. Also, when it's a cold start, it will surge for half a minute.
Did replace the sparkplug with what the factory suggests, and I even think it made it a bit worse. No matter if the air filter is on or not. New intake-to-intake-pipe gaskte was put on.
Only thing lef to do is to clean the carb, but it was taken off of a working mower with the same specs, and it ran good when it was on it.
What could it be?
(there are 3 videos)
I can not get my BVS153/Vantage engine to run smoothly.
It not that it revs up and down and such governor issues, it's more like constant smaller misfires and non consistent running. No matter low or high throttle, it always has that issue. It doesn't bog down when under load, or anything. Also, what I noted is that when I give it more throttle, but in a quick manner, it would over-rev and then drop down to the normal speed (not sure if it matters, but I never had that issue before).
Carb is an adjustable Dellorto type, but it originally came with a non-adjustable one, both mixture-wise and thrrotle-wise. Never could get it to run with the orignal carb as it was full of something as it stood for a long time.
I did try adjusting it, finding the perfect spot but it has no meaning whatsoever, as going too high or too low just makes it bog or run very badly, so the mixture screw doesn't do much here. Also, when it's a cold start, it will surge for half a minute.
Did replace the sparkplug with what the factory suggests, and I even think it made it a bit worse. No matter if the air filter is on or not. New intake-to-intake-pipe gaskte was put on.
Only thing lef to do is to clean the carb, but it was taken off of a working mower with the same specs, and it ran good when it was on it.
What could it be?
(there are 3 videos)