Gear box drain plug length

Mark Pashley · Jul 11, 2018

Hi all first post, I just wondered if anybody knows the thread length of the gear box oil drain plug , as I would like to replace it with a magnetic one to catch any nasties.
Cheers
Mark 2016 961 sf 2150 miles MUT 57

TonyA · Jul 11, 2018

The gearbox oil level check plug (fill to spill) , is the exact same as the drain plug. If you remove the fill to spill , measure it and you should not loose any oil …

Mark Pashley · Jul 12, 2018

TonyA said:
The gearbox oil level check plug (fill to spill) , is the exact same as the drain plug. If you remove the fill to spill , measure it and you should not loose any oil …

Perfect, thank you very much indeed for that tip I will give it a go.

gchoppin · Jul 18, 2018

Mark Pashley said:
Perfect, thank you very much indeed for that tip I will give it a go.

If you find something that works, please post. I've got a magnetic plug on the engine side but have never seen one for the tranny. I'll bet lots of us would go after one.

Mark Pashley · Jul 19, 2018

Will do, shortest I can seem to find is 15 MM , tranny plug is only about 10 mm long , will let you know after the summer when I change the oil , also have gold magnetic plug for engine after oil pump issues , strainer ,non return value and new oil pump fitted by Norton, all seems fine now though.

stratos · Jul 23, 2018

Is this the correct size for engine or tranny?
https://www.motorcyclepartsstore.co.../magnetic-oil-drain-sump-plug-bolt-m14-x-1.5/

TonyA · Jul 23, 2018

M14 is the engine sump plug size.

Mark Pashley · Jul 23, 2018

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/183304435582

This is the same size and thread pitch as the over flow plug but is 15 mm in length, there is another magnetic plug around ,gold type, but 19mm in length . When I drain the tranny I will check if 15mm is ok in length .

Mark Pashley · Jul 23, 2018

I have changed the engine oil sump plug for a gold magnetic one with a traditional hex head already , no issues.

stratos · Jul 26, 2018

Just found this website for magnetic tranny plug, just need to find out thread pitch for engine and i'll order both.

https://shop.motorsport-developments.co.uk/m10-x-10-x-12mm-magnetic-oil-sump-drain-plug-9433-p.asp

Mark Pashley · Jul 26, 2018

stratos said:
Just found this website for magnetic tranny plug, just need to find out thread pitch for engine and i'll order both.

https://shop.motorsport-developments.co.uk/m10-x-10-x-12mm-magnetic-oil-sump-drain-plug-9433-p.asp

Hi Stratos , good find thread pitch is 1.5 . Would be really interested how you get on with this plug, plz keep us posted .

Regards,

Mark

Joe 961 · Sep 16, 2023

gchoppin said:
If you find something that works, please post. I've got a magnetic plug on the engine side but have never seen one for the tranny. I'll bet lots of us would go after one.

May start making them let you know

cliffa · Sep 16, 2023

I drilled a recess in the end of the plug, then attached a magnet with JB weld, however I thought the later bikes were fitted with magnetic plugs?

Joe 961 · Sep 16, 2023

No not at all do the same I think

TonyA · Sep 16, 2023

Joe 961 said:
No not at all do the same I think

You have a 10mm x 1.0 pitch drain plug. (same as the level check plug) About 10mm of length but you can be 1 to 2 mm longer .
This is the best one I have found yet :

https://votex-us.com/DP030

Gear box drain plug length

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