10hp & 12hp Timing.
#1
In answer to a club members query on Distributor timing and "missing" timing ball.
 
Set you TDC for number one manually regardless of distributor position.
Piston at top after exhaust valve closes on number one.
You should see where the ball location or the hole if it's missing.
Check position of rotor, you may be 180 deg. out as Bugas03 says in previous reply.

Steel ball indicates 2 deg. BTDC.
At idle (approx. 400 RPM) this ball should be static at the pointer using a strobe - If you can get it to a lower RPM all the better.
Advance is taken over by vacuum (this can start at 400 RPM) and mechanical means within distributor.
Your distributor should be a DKZ4A-P27 @ 18 deg. crank advance.
Make sure someone has not fitted a DKZ4A-P31 which has 27 deg. crank advance (as in the 12hp)
Regards.
Chas.

A pessimist sees difficulty in every opportunity. A optimist sees opportunity in every difficulty.
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#2
(20/06/2018, 01:42 PM)Chas Wrote: In answer to a club members query on Distributor timing and "missing" timing ball.
 
Set you TDC for number one manually regardless of distributor position.
Piston at top after exhaust valve closes on number one.
You should see where the ball location or the hole if it's missing.
Check position of rotor, you may be 180 deg. out as Bugas03 says in previous reply.

Steel ball indicates 2 deg. BTDC.
At idle (approx. 400 RPM) this ball should be static at the pointer using a strobe - If you can get it to a lower RPM all the better.
Advance is taken over by vacuum (this can start at 400 RPM) and mechanical means within distributor.
Your distributor should be a DKZ4A-P27 @ 18 deg. crank advance.
Make sure someone has not fitted a DKZ4A-P31 which has 27 deg. crank advance (as in the 12hp)



HI
Yes, there are a ball ….
and what is this ?? ….


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#3
The picture indicates 'Upper Centre' and the two lines are 2 degree before TDC

American way was to have a figure before or after the UC line/ball which would indicate advance or retard amount in degree's
The use of the 'UC' (upper centre) derives from the American terminology meaning TDC
 
Looks like the steel ball has fallen out of the hole.
Regards.
Chas.

A pessimist sees difficulty in every opportunity. A optimist sees opportunity in every difficulty.
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#4
Big Grin 
(21/06/2018, 09:44 AM)Chas Wrote: The picture indicates 'Upper Centre' and the two lines are 2 degree before TDC

American way was to have a figure before or after the UC line/ball which would indicate advance or retard amount in degree's
The use of the 'UC' (upper centre) derives from the American terminology meaning TDC
 
Looks like the steel ball has fallen out of the hole.

Excellent …..


Smile Smile  


I have two (2)  methods to time my engine …..


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#5
(21/06/2018, 10:52 AM)BUGAS03 Wrote:
(21/06/2018, 09:44 AM)Chas Wrote: The picture indicates 'Upper Centre' and the two lines are 2 degree before TDC

American way was to have a figure before or after the UC line/ball which would indicate advance or retard amount in degree's
The use of the 'UC' (upper centre) derives from the American terminology meaning TDC
 
Looks like the steel ball has fallen out of the hole.

Excellent …..


Smile Smile  


I have two (2)  methods to time my engine …..

This is the one to go for.
Copy the indent on the ring gear (with 6mm drill) to the flywheel before you replace the ring gear.
As mentioned, the 2 after the ball/indent indicates 2 degrees before TDC (UC).
Spot marker on flywheel indicates TDC.
Regards.
Chas.

A pessimist sees difficulty in every opportunity. A optimist sees opportunity in every difficulty.
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