speedo drive/pinion
Turbo Mini Forums

Not long got in, I'll go check now!

lovely

My pinion is a 17t, but I think the worm may be 6t, picture here so somebody can confirm if it is or not!

Not from that angle - you need to look at it end on...

Metric is for people who can't do fractions.

Man, I'm tired lol.
Sure it's definately 6 in that case...

if thats deffo right ill have it off you!
so i just need the pinion then....

I just bought a brand new 7-tooth spindle from 'Spares to put in a friends MPi - over £50 !!!

I've got quite a few 5 & 6-tooth spindles if anyone nees one.

Metric is for people who can't do fractions.

Hi folks, just reviving an old post...

I am trying to figure out which drive I need for my speedo cable. I have used the calculator on guessworks site and come to the conclusion that I need a 6/16 drive.

Here are the variables I have used..

Tyre size 165/70 R10
3:1 final drive
90 mph Nippon Seiki clock

Can anyone tell me if this is correct as I can’t find an exact 3:1 final drive in the selection?

Thanks,

Dave.

The actual ratio of the 3.1 is there it's just stated more accurately as 3.105
So your correct you want a 6/16 worm and pinion.

Yeah that’s what I figured... went with the closest one.

Cheers..... 👍

And am I right in thinking I need both of theses gears.....?

http://www.guess-works.com/Shop/Parts/?typ...rgument=SPD6/16

I thought I only needed one... but thinking about it... I guess I need both as one drives the other?

Edited by evad1980 on 22nd Jul, 2020.

Ok... I think I’ve found the answer to my own question....

Found this posted on another thread....

22nd Feb, 2009 at 08:19:50pmPM User | Quote
It isn't the pinion that you need to change particularly, it's the worm/pinion combination, and if you have the five tooth worm, it's the worm especially that you need to change.

To change the worm, you need to get the plastic "pinion" out first.... That is like undoing the speedo cable at the bottom end but even harder........ but it can be done, so if it was only the plastic gear...... difficult but not too bad.

But if it's the worm that needs changing, after removing the plastic pinion, then you need to get the two small bolts out and the small plate off the end of engine mounting alloy cover.....

except that there is an alloy adapter bolted on top of this (3 studs through the gearbox and one strange countersunk phillips headed bolt)....

and on top of this is the bracket that does the engine mount and bottom of the radiator, and on top of this is the radiator and engine mounting block.....

So if you can remove the radiator, the engine mount, the steel bracket, the alloy block, the two small bolts, and get some pliers in there to pull the worm out....... all without removing the engine, well done !!!

Sorry to sound cynical - I'm sure it's possible given enough time (the phillips headed bolt will be VERY difficult in situ) - but I personally would take the engine back out.