Timing of joe hunt magneto

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akellerman7772
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Timing of joe hunt magneto

#1

Post by akellerman7772 » Sun Jan 21, 2018 5:12 pm

Building a 1949 G motor and I’m at the end of the project. Purchased a joe hunt magneto and the timing instructions are very vague. Called joe hunt to ask for their input and their info differs from everyone else. They say that the cam lobe in the mag has to be facing the front cyclinder everyone else says the cam lobe has to be facing the rear cyclinder ? Can anyone tell me the correct way to time this magneto.
Akellerman7772



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Re: Timing of joe hunt magneto

#2

Post by 1950Panhead » Sun Jan 21, 2018 7:17 pm

The two lobes that are closest to each other are front then rear.
Points open front cylinder fires, engine turns 315 degree (360-45), points open rear cylinder fires.
Use flywheel timing mark for front cylinder.

akellerman7772
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Re: Timing of joe hunt magneto

#3

Post by akellerman7772 » Sun Jan 21, 2018 8:39 pm

Thanks for your input but I was looking or the process of setting up the timing of the cyclinders to the small cam lobe of the magneto and does the small lobe on the mag face the rear cyclinder at top dead center or the front cyclinder.
Thanks
Akellerman

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Re: Timing of joe hunt magneto

#4

Post by 1950Panhead » Sun Jan 21, 2018 9:19 pm

1) Rotate engine until timing mark appears in hole, check valves are close
2) Remove mag, insert mag so points just open on 1st lobe
It works best if 1st lobe points toward the moon, it does not matter

akellerman7772
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Re: Timing of joe hunt magneto

#5

Post by akellerman7772 » Sun Jan 21, 2018 9:24 pm

Thanks.
Akellerman

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Re: Timing of joe hunt magneto

#6

Post by kitabel » Tue Jan 23, 2018 10:46 pm

Who is "everyone else"?

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Re: Timing of joe hunt magneto

#7

Post by RUBONE » Wed Jan 24, 2018 12:33 am

Keep in mind that ALL ignition points timing systems function the same way, despite where the power source is. So if you can time your engine with a stock timer, the magneto timing is the same. Small (as in narrow) lobe is the front cylinder on all points systems. All the magneto does is change the power source from external to internal, but the timing sequence is exactly the same. It doesn't matter who the manufacturer of the magneto was (they are all Fairbanks Morse clones anyway) or if it is a stock timer or aftermarket points type. Set points gap first, then with compression stroke on front cylinder, points just beginning to break at full advance with mark in the timing hole, done.

akellerman7772
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Re: Timing of joe hunt magneto

#8

Post by akellerman7772 » Wed Jan 24, 2018 2:02 am

Thank you for your input and will do it the way you explained.
Than you again
Art Kellerman

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Re: Timing of joe hunt magneto

#9

Post by Frankenstein » Thu Jan 25, 2018 1:38 pm

I think the confusion is about the actual physical orientation of the mag body. On some machines, sporties in particular, the body will only physically fit on the bike one way and give you clearance to rotate the mag enough to be able to retard the timing for starting and then advance it for running. The actual timing procedure is as others have described it. On a '45, you may not even need to retard it for starting. All machines are a little different as to what works best for starting.
I've run mags on BTSV's and '45's, and they worked just great, had no starting difficulties.
Good luck.
DD

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