- Tue Jun 02, 2020 9:00 am
#90449
Finally took the 612 out last night after taxing it, normally I would have started riding it around March time.
Anyway this is the first time I have ridden it since fitting the Amal Premier carb and going up 1 tooth on the gearbox sprocket.
I am pleased to say that I am very happy with these mods, the motor feels more responsive than it was with the old worn out Amal on it, and the extra tooth on the gearbox sprocket makes for more relaxed cruising, it does not seem to have affected acceleration.
The only issues I have are that the clutch is slipping a little under hard acceleration, I just need to turn the clutch spring screws in a couple more turns, I really must make a note of the screw positions next time I have it apart. Bob Newby clutch by the way and does not normally slip.
The other issue is that the lever that operates the choke keeps rotating around to close the choke while you are riding – if you tighten the screw to stop it turning you cannot operate the choke.
I am seriously considering drilling a small hole in it to suit a small R clip (which I can keep on a lanyard attached to the lever) to stop it rotating.
The lever does not seem to have anything to prevent it from moving under vibration – seem to remember that some of them have a large diameter wavy washer.
Finally, the battery in the bicycle speedo was nearly flat so it was showing my speed as anywhere between 65 & 118 MPH most of the time. I rely on the bike speedo as the OE speedo really is just an ornament I call is the “approxometer” battery now replaced.
Anyway this is the first time I have ridden it since fitting the Amal Premier carb and going up 1 tooth on the gearbox sprocket.
I am pleased to say that I am very happy with these mods, the motor feels more responsive than it was with the old worn out Amal on it, and the extra tooth on the gearbox sprocket makes for more relaxed cruising, it does not seem to have affected acceleration.
The only issues I have are that the clutch is slipping a little under hard acceleration, I just need to turn the clutch spring screws in a couple more turns, I really must make a note of the screw positions next time I have it apart. Bob Newby clutch by the way and does not normally slip.
The other issue is that the lever that operates the choke keeps rotating around to close the choke while you are riding – if you tighten the screw to stop it turning you cannot operate the choke.
I am seriously considering drilling a small hole in it to suit a small R clip (which I can keep on a lanyard attached to the lever) to stop it rotating.
The lever does not seem to have anything to prevent it from moving under vibration – seem to remember that some of them have a large diameter wavy washer.
Finally, the battery in the bicycle speedo was nearly flat so it was showing my speed as anywhere between 65 & 118 MPH most of the time. I rely on the bike speedo as the OE speedo really is just an ornament I call is the “approxometer” battery now replaced.
Previous bikes - far too many !!