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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Timing Marks


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  #1  
Old 03-10-2018, 01:54:23 PM
Geochurchi Geochurchi is offline
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Default Timing Marks

Hi All, FM Z 1 1/2 HP ,We canít find any of the timing marks described in the manuals,only things are a punch mark in the flywheel hub and a groove in the side of the cam shaft.
Geo
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Old 03-10-2018, 03:09:04 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Timing marks

If you cannot find the timing marks, there is another way to set the cam timing. Turn the engine so that the piston is at TDC. The exhaust valve should be JUST closed at TDC. Turning the engine clockwise, at the mag side, the exhaust valve should open at about 20 degrees before bottom center on the power stroke.. The opening timing is not critical, the closing at TDC is.
Andrew
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Old 03-10-2018, 03:17:30 PM
Geochurchi Geochurchi is offline
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Default Re: Timing marks

Thanks, I will get this figured out! Should that exhaust valves push rod feel sloppy ? Almost seems to short.
Geo
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Old 03-12-2018, 01:42:37 AM
cobbadog cobbadog is offline
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Default Re: Timing Marks

I just finished reading an article in a local magazine that covers this very topic of timing your spark when you have a lot of wear and tear in the drive gears and sloppy linkages.
This guy used sticky tape to attach a strip of fax paper to the OD of the flywheel before and after the spark mark. With spark plug out and the HT lead held in place at the position of TDC and the end of the HT lead held in place at that level and very close to the flywheel he then cranked the engine over. You could see each time the spark fired and at what position and he then was able to set his timing at the correct BTDC timing for ease of starting.
I know this does not help you with valve timing but it is a good way to get the spark right.
I notice you keep mentioning the gap of the push rod to the valve stem. With both of my Buzacott hit n miss engines I can put my little finger in the gap. The main thing is that the valve does not get opened too far and make contact with the piston so if the valve opens that is a good starting point.

Hope this helps.
P.S. If no fax paper is available apparently some shopper dockets use a similar type of paper for their receipts. Tip was to put the shiny side outwards too.
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Old 03-12-2018, 09:02:02 AM
DustyBar DustyBar is offline
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Default Re: Timing Marks

Ive read this Gas Engine Magazine article "Setting Valve and Ignition Timing by Tramming". I haven't needed to try it myself but I think it should work.
https://www.gasenginemagazine.com/ga...es/tramming-in
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Old 03-12-2018, 01:07:59 PM
Geochurchi Geochurchi is offline
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Default Re: Timing Marks

I remember something like this when I had to set the timing on a 6 HP I restored many years ago, but I can’t remember how it worked,seemed simpler than this even.
Geo
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Old 03-12-2018, 02:04:57 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Timing Marks

On the F/M engines, there is no set valve clearance. Initially, it will be in the area of about 1/4", but will have to be adjusted, once you get the cam timing right. You set the cam so the timing is close, then adjust the clearance to get the valve JUST closed at TDC. Once that is set, exhaust valve opening is automatic, set by the cam profile. Once the valve timing is correct, the ignition should also be set, if you have the AB 33 or 34 magneto.
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Old 03-12-2018, 04:36:00 PM
Geochurchi Geochurchi is offline
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Default Re: Timing Marks

Thanks, AB33 mag.
Geo
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