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  Stator plate has to be set at limits- timing a 247
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   Author  Topic: Stator plate has to be set at limits- timing a 247  (Read 649 times)
EricR
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Stator plate has to be set at limits- timing a 247
« on: March 16, 2017, 09:12:43 AM »
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Hey all-

I am putting together a spare 247 Elan mill.  I started with a '71 mill (HR73A carb, black paint) that had compression and lots of cobwebs on it.

Took it apart, inspected, re sealed and re assembled. It had no spark and a Kimpex coil when I took it down, I had another single cyl stator with Bosch parts on it, it came from an electric start single judging by the lighting coil (large with two yellow/red stripe leads) so I swapped out that for the regular lighting coil as I have no E start machines.

Timing it using the method in GaJawins videos as I have done a few before, I ran into something odd.

I usually start by putting the stator slots with the bolts in the middle, and go from there.

Timing spec on this is .147-.170 or there abouts- I usually go for a mid range or slightly advanced.

On this one, I had to go nearly to the end of the slots counter clock wise, as in advanced, to get .155".  And yes this was with the advance lever held down as per the procedure, direct timing, with the head off and a dial indicator showing me the position measured from TDC.

I have never had to move one that far towards the limit of the adjustment to get it before.

Now I am pretty sure the stator I put on had the same number on the back.  I am not taking it back apart now to verify that now I have it timed and it has nice blue spark.

The thing that comes to mind is the possibility the crankshaft is twisted slightly out of phase, which I have heard can happen due to a big backfire or such. They are just pressed together correct?

 

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GaWajn
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Re:Stator plate has to be set at limits- timing a 247
« Reply #1 on: March 16, 2017, 01:25:56 PM »
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I have run into this situation a few times before. I even had one occasion that required me to bank the stator plate against the very end of the slot to get it into the acceptable timing range!

There are many factors that could cause this variance I think. We don't always know if the parts are original to the engine. In my opinion, points ... points gap ... stator plate ... cam ... crank stub (mag side) ... all these could have an effect on the position of the stator plate to be able to get the engine timed correctly. There is a reason why the slots are large on these stator plates. I believe it is to have enough range, considering all the variables involved in this system.
« Last Edit: March 16, 2017, 01:28:17 PM by GaWajn » Report to moderator Logged

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mikesskidoo
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Re:Stator plate has to be set at limits- timing a 247
« Reply #2 on: March 16, 2017, 01:57:53 PM »
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my initial guess woul be the advance cam is not original to the engine? or aftermarket points which almost never time the same as what you took out(bosch). also as the plastic stub that rides on the cam wears it retards the timing.
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EricR
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Re:Stator plate has to be set at limits- timing a 247
« Reply #3 on: March 16, 2017, 02:18:57 PM »
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Well I see I am not alone in this. Yes, it has bosch points, don't know if they are the originals, and yes the cam may not be original etc.

I'm certainly not going to be tearing back in to it and swapping parts around to get a stator plate that gives me the spec with it closer to the middle. 

Just wanted to affirm that I was not in fact crazy.

Now to go through my carb etc, make it run on my test stand.

Thinking of a long pipe with a megaphone on the end coming out the roof peak above my garage door, I will just randomly start it and braaap the thing a few times LOL.
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GaWajn
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Re:Stator plate has to be set at limits- timing a 247
« Reply #4 on: March 16, 2017, 02:58:35 PM »
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Mikesskidoo brings up a good point ... WEARING of parts ...  now why didn't I think of that 
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Bones
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Re:Stator plate has to be set at limits- timing a 247
« Reply #5 on: March 17, 2017, 08:33:04 AM »
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Quote from: EricR on March 16, 2017, 02:18:57 PM   



Just wanted to affirm that I was not in fact crazy.


I think there is many here that might question that 
Bones
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EricR
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Re:Stator plate has to be set at limits- timing a 247
« Reply #6 on: March 17, 2017, 05:24:04 PM »
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Ya gotta be a tad crazy to mess with these old dogs, especially when you live a looooong way from any snow!
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bom600
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Re:Stator plate has to be set at limits- timing a 247
« Reply #7 on: March 17, 2017, 08:34:25 PM »
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I had a similar situation timing a 340 single. While the point gap was within tolerance once I set them to center of the tolerance timing came back from the upper range. Only took me almost two weeks to figure that out.
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