Post by paemt1 on Aug 29, 2012 20:18:38 GMT -5
Hey all,
I just installed some "parts" and need some of your knowledge.
I have a Sym DD50 and had soft-seized my original engine. I put in several new parts which I know is not the smartest thing to do because when you do have a problem (like I have) then it makes it difficult to track down the problem. That being said, this is what I have replaced:
75cc BBK
44mm crank(my old crank needed to be replaced because when I soft-seized the 50cc, the conrod bearings were also damaged)
New variator and 9gram weights
Rejetted the stock carb #82
I had a #88 in the stock carb but you fine folks told me that it was too large for my stock engine even though I had removed the intake manifold restriction and installed an aftermarket exhaust.
After I had installed the BBK, I attempted to place an #85 but could just not adjusted correctly. So I installed the #82 and have been "tinkering" with the a/f and idle screws most of the day. I started with the a/f screw at 2 1/2 turns out. Had to continue to adjust the screw to the right until it was only about 1/2 turn out to get the thing to stay running and not "bog" at 1/4-1/2 throttle. I was working on my "break-in" ride when, at about 40 mph, I felt the BBK kick in. AWSOME . I didn't want to damage the cylinder so I let off the throttle. The old girl stalled. I let the scooter "free wheel" until I could pull over, stop and restart. It started right back up and I rode it home, SLOWLY. I made some minor adjustments, didn't seem to change much of anything. I took it for a second ride and the same thing happened. I decided to ride it to work, SLOWLY, because I am very lucky and can "tinker" at work. I was 3/4 of the way there. I started going down a hill and the scooter sped up. I attempted to slow down and let off the throttle and began to break. The scooter shut down as soon as I let off the throttle. This time, it free wheeled for a short time then the transmission grabbed and locked up the rear wheel. It destroyed my belt, of course, then started to free wheel again. I was able to get it to work with a little help from my co-workers who weren't too far away.
Two questions:
1. I did check my plug(not a new one but the only plug I have currently) and it was light grey. I believe that is too lean but if I adjust the carb and richer, it just boggs and will eventually stall.
2. Why is the bike stalling at speed when I let off the throttle?
I need all your expertise, please!!!!!
I just installed some "parts" and need some of your knowledge.
I have a Sym DD50 and had soft-seized my original engine. I put in several new parts which I know is not the smartest thing to do because when you do have a problem (like I have) then it makes it difficult to track down the problem. That being said, this is what I have replaced:
75cc BBK
44mm crank(my old crank needed to be replaced because when I soft-seized the 50cc, the conrod bearings were also damaged)
New variator and 9gram weights
Rejetted the stock carb #82
I had a #88 in the stock carb but you fine folks told me that it was too large for my stock engine even though I had removed the intake manifold restriction and installed an aftermarket exhaust.
After I had installed the BBK, I attempted to place an #85 but could just not adjusted correctly. So I installed the #82 and have been "tinkering" with the a/f and idle screws most of the day. I started with the a/f screw at 2 1/2 turns out. Had to continue to adjust the screw to the right until it was only about 1/2 turn out to get the thing to stay running and not "bog" at 1/4-1/2 throttle. I was working on my "break-in" ride when, at about 40 mph, I felt the BBK kick in. AWSOME . I didn't want to damage the cylinder so I let off the throttle. The old girl stalled. I let the scooter "free wheel" until I could pull over, stop and restart. It started right back up and I rode it home, SLOWLY. I made some minor adjustments, didn't seem to change much of anything. I took it for a second ride and the same thing happened. I decided to ride it to work, SLOWLY, because I am very lucky and can "tinker" at work. I was 3/4 of the way there. I started going down a hill and the scooter sped up. I attempted to slow down and let off the throttle and began to break. The scooter shut down as soon as I let off the throttle. This time, it free wheeled for a short time then the transmission grabbed and locked up the rear wheel. It destroyed my belt, of course, then started to free wheel again. I was able to get it to work with a little help from my co-workers who weren't too far away.
Two questions:
1. I did check my plug(not a new one but the only plug I have currently) and it was light grey. I believe that is too lean but if I adjust the carb and richer, it just boggs and will eventually stall.
2. Why is the bike stalling at speed when I let off the throttle?
I need all your expertise, please!!!!!
