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john melia 125/04/2017 08:22:35
1770 forum posts
24 photos

i am foremost a petrol engine guy , but bought a saito 125a , and i'm having a right old time getting a spinner for this engine

i bought a plastic spinner with an aluminium back plate which lasted three flights , on the fourth it exploded while using the starter

i then bought an aluminium spinner , with the usual single bolt through the centre , but it wont fit as the sujpplied adapter nut will not screw on the crank far enough

can someone point me in the right direction for a spinner for this engine , spinner needs to be no bigger than 2.5 inches , and its to go on the seagul glasair , which by the way i maidened last weekend and its a joy to fly

ASH.25/04/2017 09:05:39
333 forum posts

Hi John, in the past I've had to cut the bolt to fit. Call MacGreggor in Reading they should be able to help. Also, Inwoods in Cambridgeshire do domed locking nut for Saitos if it suits.

Edited By ASH. on 25/04/2017 09:21:46

Denis Watkins25/04/2017 09:28:03
4177 forum posts
83 photos

Most spinner nuts are brass John,

But Just engines do all manner of steel equivalents

To save aluminium shreading, do not go too big, as they will flex when applying the starter

I use mostly 2 inch as they are quite sturdy and do not look so bad

I appreciate you want bigger than 2.5, but these have to be best fit and can be pinned for strength buy 2 bolts through the backplate

Edited By Denis Watkins on 25/04/2017 09:31:06

Gary Manuel25/04/2017 09:28:54
2190 forum posts
1540 photos


Depending on the thickness of your propeller, you may need to omit the special Saito Locknut to get the adapter on far enough. The adapter will act as a lock nut of sorts though.

jrman25/04/2017 10:02:23
366 forum posts
3 photos

Try Tru-Turn in the USA. They're not cheap but they are excellent quality and will do a custom cut on the spinner if you tell them what size and make of prop you intend using. They also do special lock nuts and spinner bolts to suit just about any engine

onetenor25/04/2017 10:03:09
1901 forum posts

Would a tube nut help with the reach to the thread

Bob Cotsford25/04/2017 10:21:09
8248 forum posts
454 photos

This is what you want, halfway down the page "Steel Locking Adapter for Large 4 strokes"

It replaces the standard locknut.

Gary Manuel25/04/2017 10:59:30
2190 forum posts
1540 photos

Good call Bob.

I didn't know about them. That's exactly what's needed.

May be buying one or two of them myself (Saito 82 and 150 with similar issues).

Bob Cotsford25/04/2017 12:20:30
8248 forum posts
454 photos

I must admit that I've made my own by putting a standard adaptor in the pillar drill and using a file to adjust the profile of the blunt end, then putting a slot down it with a hacksaw to allow the internal thread at the end to compress onto the prop shaft. Seems to work ok.

Rich too25/04/2017 14:39:40
3057 forum posts
1070 photos

I agree, cut the bolt to length. I rarely find the bolt is the correct length or size. Start it by hand?wink

john melia 125/04/2017 15:12:29
1770 forum posts
24 photos
Thanks Bob just ordered one of those from JE , i also asked them about a petrol conversion , and they said a lot of people have converted the saito to petrol , with no significant loss of power
I will be converting at the end of the summer with the kit JE supply

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