P125x front axle nut size- help and advice needed.
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Member
Vespa P125X
Joined: 30 Aug 2017
Posts: 19
Location: Dubai
Sat Aug 01, 2020 5:55 am quote
Hi all, was trying to install a grimeca front disc on my p125x. When taking the nut off, it stripped. My fault wasnt aware of the jesus nut thing! Anyway I managed to get it off with a chisel. The thread of the axle doesnt look too bad but I thought I would run a die around it to make everything a little tidier. I assumed it was an M12 and have an m12 nut. Neither nut nor die really want to go on, which has made me think twice. I have searched and cant really find a definitive answer on the thread and nut size. Is it M12 or something else? Any advice is sincerely appreciated.
Molto Verboso
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 1962
Location: Veria, Greece
Sat Aug 01, 2020 7:13 am quote
There are two axles and two nuts on P/PX models. The 16mm axle uses an M12x1,5mm expansion nut. The 20mm axle uses an M14x1,5mm nut with a separate locking cage...

https://www.sip-scootershop.com/en/products/nut+hexagonal+steel+zinced_78110000

https://www.sip-scootershop.com/en/products/nut+m14x15+mm+steel+zinc_12640900
Addicted
'64 Motovespa 150S (177) , '66 Allstate SF, '64 VBB
Joined: 27 Mar 2013
Posts: 640
Location: S.Salem, NY
Sat Aug 01, 2020 8:01 am quote
what the hell is a jesus nut ?
Addicted
bare metal cafe racer
Joined: 01 Sep 2017
Posts: 859
Location: Aotearoa (New Zealand)
Sat Aug 01, 2020 8:56 am quote
Moto64 wrote:
what the hell is a jesus nut ?
One that’s held in place with nails?
Hooked
79p200e 66smallstate 85pk50xl 84p125ets 63GL150
Joined: 24 Nov 2016
Posts: 168
Location: Flatness, Tx
Sat Aug 01, 2020 9:26 am quote
Moto64 wrote:
what the hell is a jesus nut ?
Only one I know of is on a helicopter main rotor. If it fails, you better start praying...

from Wikipedia:

Jesus nut is a slang term for the main rotor retaining nut[1] or mast nut, which holds the main rotor to the mast of some helicopters. The related slang term Jesus pin refers to the lock pin used to secure the retaining nut. More generally, Jesus nut (or Jesus pin) has been used to refer to any component that is a single point of failure which results in catastrophic consequences.
Addicted
2007 Stella 150
Joined: 02 Nov 2019
Posts: 761
Location: Rochester, Minnesota
Sat Aug 01, 2020 9:34 am quote
I know those little e clips that go flying across the room to be lost forever are Jesus clips.
Hooked
Rat 2003 Stella 2T; 1979 P125x (in pieces, out for paint)
Joined: 12 Sep 2015
Posts: 180
Location: Madtown
Sat Aug 01, 2020 4:58 pm quote
It’s a primitive locknut that you lock by denting it with a sharp hammer blow to a chisel. Standard on the old p front axel. Pray to Jesus that it doesn’t come loose? Yell “Jesus Christ” when trying to get it off?
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 7799
Location: The state of insanity, SoCal
Sun Aug 02, 2020 2:36 pm quote
Moto64 wrote:
what the hell is a jesus nut ?
it's that little tiny nut that jumps out of your hand and goes skittering across the floor and then you say: oh jesus where did that nut go?

see also: jesus key

-g
Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: 21 Oct 2005
Posts: 7799
Location: The state of insanity, SoCal
Sun Aug 02, 2020 2:37 pm quote
you must peen the nut...

-g
Member
Vespa P125X
Joined: 30 Aug 2017
Posts: 19
Location: Dubai
Mon Aug 03, 2020 12:05 am quote
Hi all, thanks for all the comments and help here. Thanks for the SIP links. Yes its a 16mm front axle.
The thread on the axle is not great but I will try and find a M12, 1.5mm die that can sharpen things up.
Thanks again for the comments and help.
Yes Jesus Christ when I was getting the nut off for sure. And a lot more Jesus Christs trying to find a die and a new nut!!!!!
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