I have just rebuilt the Sachs 47cc engine on my 1972 Arctic Cat Prowler and I need some expert ears to give me some feedback.
I went through every square inch and replaced the crank, bearings, seals and installed new clutch disks for first and second gear. I was careful to check the tolerances where possible and adjust shims accordingly. Exhaust is NOS.
My concern is that I hear what could be described as a ticking noise when it's running. I can crank it over slowly by hand and occasionally hear the noise but it only happens occasionally by hand. There is no repeatable spot in the rotation. I know that everything in the crank, arm, and piston is practically brand new. There is no slop in this engine other than a slight wiggle in the clutch disk housing but I think it's close to specs. I don't recall if this is the normal sound of this engine as I haven't had it running since 1983.
Does anyone out there with one of these engines care to comment on the sound of this engine? Is it normal? The timing is set to specs but I suppose it could be a bit off or advanced. The engine has good power. Does it sound like it's pinging? Shifting from first to second is a bit hesitant, especially uphill. Top end bogs a tiny bit on full-throttle but not terrible. Spark plug color looks to be a good medium brown. With the plug out, pulling the recoil is fairly silent. The plug is NOS and is not contacting the piston. Is it just the noise from the reed valve?
Take a look and listen here:
1972 Arctic Cat Prowler Minibike - YouTube
Thanks for the input! BTW, this was my son's FIRST minibike ride and boy was he excited. His first words after the ride were "That was Awesome!". I think he's hooked. Definitely a future new member for the forum.
I went through every square inch and replaced the crank, bearings, seals and installed new clutch disks for first and second gear. I was careful to check the tolerances where possible and adjust shims accordingly. Exhaust is NOS.
My concern is that I hear what could be described as a ticking noise when it's running. I can crank it over slowly by hand and occasionally hear the noise but it only happens occasionally by hand. There is no repeatable spot in the rotation. I know that everything in the crank, arm, and piston is practically brand new. There is no slop in this engine other than a slight wiggle in the clutch disk housing but I think it's close to specs. I don't recall if this is the normal sound of this engine as I haven't had it running since 1983.
Does anyone out there with one of these engines care to comment on the sound of this engine? Is it normal? The timing is set to specs but I suppose it could be a bit off or advanced. The engine has good power. Does it sound like it's pinging? Shifting from first to second is a bit hesitant, especially uphill. Top end bogs a tiny bit on full-throttle but not terrible. Spark plug color looks to be a good medium brown. With the plug out, pulling the recoil is fairly silent. The plug is NOS and is not contacting the piston. Is it just the noise from the reed valve?
Take a look and listen here:
1972 Arctic Cat Prowler Minibike - YouTube
Thanks for the input! BTW, this was my son's FIRST minibike ride and boy was he excited. His first words after the ride were "That was Awesome!". I think he's hooked. Definitely a future new member for the forum.
