Airone Front Sprocket

[Alan Comfort]

In the process of dismantling the Airone engine, I have hit a bit of a wall. The lock ring that is outboard to the kick start ratchet refuses to budge..Just wondering if this is a left hand thread. I have had these things apart many times and do not recall it being this stubborn. I have made a peg spanner and Have applied heat and some significant force, but no joy. Just want to confirm that I am turning the right way, before I bring out the big hammer.

Alan in Roberts Creek

[Joe Joseph]

On the SA it is a LH thread. 

On Sat, Feb 7, 2026 at 11:22 AM Alan Comfort <alan.c...@gmail.com> wrote:

In the process of dismantling the Airone engine, I have hit a bit of a wall. The lock ring that is outboard to the kick start ratchet refuses to budge..Just wondering if this is a left hand thread. I have had these things apart many times and do not recall it being this stubborn. I have made a peg spanner and Have applied heat and some significant force, but no joy. Just want to confirm that I am turning the right way, before I bring out the big hammer.

Alan in Roberts Creek

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[Patrick Hayes]

On 2/6/26 14:22, Alan Comfort wrote:
> The lock ring that is outboard to the kick start ratchet refuses to budge..

Just to clarify. There are TWO lock rings here. Both are standard
threading. The outboard one that you describe locks all of the kick
start pieces together. The other/inner lock ring secures the drive
pinion sprocket to the transmission output shaft. That inner lock ring
is further secured in place by a very short grub screw. The inner lock
ring has four perimeter slots for tool engagement. The drive sprocket
has five threaded holes. Thus, the sprocket holes mostly 'mismatch' in
alignment with the lock ring slots. You have to vary the tight/loose
function to determine which threaded hole provides best alignment and
then install the grub screw so that the drive sprocket can not turn
loose under load. Obviously you won't be able to remove the inner lock
ring until you first manage to remove the grub screw.

--
Patrick Hayes
Fremont CA
Falcone-NT and SuperAlce
www.motohayes.com

[Alan Comfort]

Thanks for jogging my memory. It has ben a little while since I've taken one of these apart. I did manage to find the tool that I made for this operation, so I am getting close to finding out why the old Airone is stuck in top gear.

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