I will answer my own enquiry. This spinner fit perfectly right out of the box. The adapter threaded right onto the prop shaft of my ASP 91 4 stroke. Only change was to use a shorter screw for holding the spinner to the adapter because the one supplied was slightly long and 'bottomed out in the prop shaft. Very nice product at an excellent price.
The M3 and M5 is for the size of the black bolt which holds the spinner on.I have to admit I think this spinner comes with a 4mm bolt and this size is not listed,2 M3 ones are listed,I am wondering if this is a mistake and one should be 4mm,will try and find out.
Figured the size numbers out now.
M8x1.25 is the thread engine side.
M3/M4/M5 is the thread spinner side.
So all I need to know now is the size of the
Spinner bolt 3mm,4mm,5mm.
Here is a URL with info on the crank shaft sizes for different engine www.link
Good spinners but in general all of these spinners above 3,5 in should have thicker backplate cause it is lacking a bit in stiffness. All in all works good.
No comments. Reply..
I have one on a 60 size mustang with a Turnigy C5065 350kv and it's doing fine. I had to mod the motor adaptor to work with it though as the included coupler was not a match for the threads on the Turnigy prop shaft. I also just picked up a 4 blade one of same manufacture and will be trying that on my stang as well.