Different threads on speedo bolt?

[kingtut]

I've ordered a new bolt for the speedometer gear 3 times now and every time it doesn't fit. Is it possible that the big boy shafts you can get that have been modded to fit the earlier apex models are a different size bolt?

 

[tedgoesfast]

Check hole with a tap to find out what pitch and sdize should be able to get a bolt anywere

 

[kingtut]

I was thinking that too. Wife is going to love that answer. Time to go buy a tap and die set

 

[tedgoesfast]

Prob a m6 by 1.5

 

[mrtwostroke]

M8 1,25

 

[kingtut]

Unfortunately the m8 didn't fit. One size up from m8? M10 is too big

 

[Winderallday!]

Possibly if the shaft is not OEM, and is an aftermarket, it could be imperial threads (3/8"), although not sure why they would if it was specific to a Yamaha.
If the M8 doesn't even come close to fitting, threads could be stripped, or it is imperial thread size.

 

[mrtwostroke]

Didn't Ulmer Racing make one?

 

[kingtut]

Possibly if the shaft is not OEM, and is an aftermarket, it could be imperial threads (3/8"), although not sure why they would if it was specific to a Yamaha.
If the M8 doesn't even come close to fitting, threads could be stripped, or it is imperial thread size.

The m8 slips right in. Threads look good. Going to the hardware store tonight to get something to pry my plug caps off...they got fouled.

 

[kingtut]

It's a 3/8. Just happens to be a fine thread and not a coarse thread like I bought...go figure.