Auto advance on a Panhead - The Jockey Journal Board

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Old 05-28-2019, 05:34 PM   #1
[JP]
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Default Auto advance on a Panhead

Hi all,

finally got the 51 Pan engine out the survivor and bolted the 52 motor I have had since January sitting on a shelf.

was easy enough to start, plenty of oil pressure and no nasty knocks, sounds like a good motor.
The carb was gummed inside, took me ages to clean and blow air through the whole damn thing.

However... timing sounded off, it was banging a bit. but also the exhaust weren't properly fitted as couldn't slide them over, need an exhaust expander to bring the pipes back to normal width.

anyway, my question, just for peace of mind.
The Pan has a circuit breaker with auto advance.
timing procedure:
compression stroke
Get BTDC line in the middle of window.
Hold cam in the forward position
Turn place till light comes on.

Just like in the video. That's the right way to do it right?
Or get it on TDC mark just coming up the window and turn circuit breaker without holding cam in forward position.

I have done this a sh!t load of times on my shovel, but now i'm doubting myself.

Thanks!


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Old 05-28-2019, 07:48 PM   #2
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Default Re: Auto advance on a Panhead

its logic - your turning the trigger advance unit to total advance - and you want the front cylinder at the total advance mark to set it static
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Old 05-29-2019, 10:03 AM   #3
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Default Re: Auto advance on a Panhead

had a bit more of a fiddle around today. sounding better, but exhausts still not fitted properly, waiting to get an exhaust expander tool to open up and be able to slide them over the exhaust ports. and I reckon there's an intake leak on the manifold as can't get it to idle properly and if you rev she stays high for a while and then drops down.

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Old 05-29-2019, 02:47 PM   #4
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Default Re: Auto advance on a Panhead

The pipes can be increased in diameter by on dolly work. Use a piece of round stock as the dolly in the pipes and hammer in lines moving around the pipes. The closer to the ID the round stock is the faster the result.
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Old 05-30-2019, 03:06 AM   #5
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Default Re: Auto advance on a Panhead

you know, I did think about that, but finding the round stock to fit was a problem, even tried force fitting a piece of exhausts of something else that just about fitted the ID... but in the end I don't really want to damage the exhaust too much as they are the ones that were on the bike and want to use them again on the new frame.

for 20 bucks I ordered an exhaust expander tool with different sizes.
Should get it today. going to try it out see if I can slide the exhausts over.

Then tackle what might be an intake leak.
I reckon it doesn't help my manifold is a bit of strange one.. when put between the cylinders it stays quite far way from the inlet ports. maybe 5/16 of an inch at a guess.
Not sure what's going on there but didn't really invest much time into it as just wanted to get the engine running and make sure it wasn't going to explode.
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Old 05-30-2019, 08:42 AM   #6
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Default Re: Auto advance on a Panhead

Your $20 expander won't do much more than straightening it up.

You can do the dolly work on the cylinder side of the pipe. Though the work will be covered by the clamp anyway.
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Old 06-05-2019, 06:51 PM   #7
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Default Re: Auto advance on a Panhead

Both of those methods work - I use the first one.
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Old 06-06-2019, 05:15 AM   #8
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Default Re: Auto advance on a Panhead

yes thanks. worked beautifully.

Managed to get the exhausts on, the engine running and idling sweet as a nut, no smoke, no knocks, perfect.
Sold it within 2 days. happy days.
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