The easy one first...
1.0 mm = 0.039 inch, so just multiply milimeters by 0.04 for a good approximation.
8 to 9 mm then is .032" to .036"
The tacho...
Well, we've been over a bunch of really odd possibilities on this sort of problem before.
The first thing I'd suggest is swapping the #1 and #3 ignition coils.
If the problem goes away, you've got a bad ignition coil or bad connections.
If the problem stays, remove the tach and clean the contacts and wire ends that screw into the back.
Give the above a try and let us know how it works.
Jim
1.0 mm = 0.039 inch, so just multiply milimeters by 0.04 for a good approximation.
8 to 9 mm then is .032" to .036"
The tacho...
Well, we've been over a bunch of really odd possibilities on this sort of problem before.
The first thing I'd suggest is swapping the #1 and #3 ignition coils.
If the problem goes away, you've got a bad ignition coil or bad connections.
If the problem stays, remove the tach and clean the contacts and wire ends that screw into the back.
Give the above a try and let us know how it works.
Jim
