Tach gone wild...

[tkent02]

I'm not sure I'm understanding where/what portion of the tach you're referring to. I've got a feeble mind & sometimes it farts...

Can you try explaning this again?? I'm still looking to get this tach to settle down.

thanks,

Mike

Take the tach cable off and look at where it was attached. There is an outer threaded tube, and an inner part with a square hole for the inner cable end to go in. This part gets spun by the cable. Turn the tach upside down, oil the gap between these two pieces. They are fairly long, the oil will go down in there over an inch, maybe closer to two. Don't use WD-40, it only lubricates for a little while, not really a lubricant. Use some type of oil thin enough to go down into the tube yet thick enough to stay there once it's in. I've used several different types of oil on several different tachs, doesn't seem to matter really. It's not a high temp high load part, it just sits and spins fairly slowly but it does need something. Sewing machine oil, motor oil, whatever.

[normGS750]

I'm going to Lowes and get some penetrating oil with tiny Teflon balls in it.
The stuff is made by Blaster.

If I understand this correctly the cable doesn't directly drive the Tach. It spins a magnetic cup or something like that, this imparts the rotation to the Tach. gearing movement.
Is that how it works?

[hikermikem]

Take the tach cable off and look at where it was attached. There is an outer threaded tube, and an inner part with a square hole for the inner cable end to go in. This part gets spun by the cable. Turn the tach upside down, oil the gap between these two pieces. They are fairly long, the oil will go down in there over an inch, maybe closer to two. Don't use WD-40, it only lubricates for a little while, not really a lubricant. Use some type of oil thin enough to go down into the tube yet thick enough to stay there once it's in. I've used several different types of oil on several different tachs, doesn't seem to matter really. It's not a high temp high load part, it just sits and spins fairly slowly but it does need something. Sewing machine oil, motor oil, whatever.

Thanks tkent02 - I get it now.

Now. if only I can find someone to help me turn my bike upside down so I can lube the tach...

[tkent02]

If I understand this correctly the cable doesn't directly drive the Tach. It spins a magnetic cup or something like that, this imparts the rotation to the Tach. gearing movement.
Is that how it works?

Correct. It's called a drag cup, the faster it spins the farther around it pulls the needle.

Thanks tkent02 - I get it now.

Now. if only I can find someone to help me turn my bike upside down so I can lube the tach...

Two cotter pins, the tach comes off in your hand. Leave the wires hooked up.