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  #21  
Old 11-04-2021, 06:56 PM
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I pulled the valve cover and the cam cover. I can see that there is a spring on the ACR next to the cam gear, but dang, it's tough to move the engine through the compression cycle! Makes me think that either the valve is not adjusted right or the spring is loose or weak. I found a very good video explanation of the ACR on youtube - here's a link: https://www.youtube.com/watch?v=M_N5...dMetalShopTime

I ran out of time today, so I'll have to wait a few days to try adjusting the valve clearance. If that doesn't work, I'll pull the engine (again), drop the oil pan, and see about just replacing the spring. Just one spring, right?
Since you now know that there is indeed an ACR, you'll want to do as I had originally posted and remove the valve spring cover, then spin it over by hand to watch for correct function. And make sure the valves are adjusted to the correct clearances.
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  #22  
Old 11-05-2021, 06:11 AM
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Since you now know that there is indeed an ACR, you'll want to do as I had originally posted and remove the valve spring cover, then spin it over by hand to watch for correct function. And make sure the valves are adjusted to the correct clearances.
Yep, that's my plan for next week. Gotta get past this weekend first - entertaining two grandkids (7 & 9 y.o.) - I'd rather be adjusting the valves on the 100, but gotta do family chores!
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  #23  
Old 11-05-2021, 07:53 AM
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Yep, that's my plan for next week. Gotta get past this weekend first - entertaining two grandkids (7 & 9 y.o.) - I'd rather be adjusting the valves on the 100, but gotta do family chores!
7 & 9 are not to young to expose to wrenching.
One day when you are no longer around they will remember helping Gr pa work on it!
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  #24  
Old 11-05-2021, 11:46 AM
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7 & 9 are not to young to expose to wrenching.
One day when you are no longer around they will remember helping Gr pa work on it!
No wrenching for these young'uns yet, but they love to ride on the H and the Cub. Maybe driving the Cub in a year or so. Heck, I was driving an H at 10!

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  #25  
Old 11-06-2021, 12:23 AM
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No wrenching for these young'uns yet, but they love to ride on the H and the Cub. Maybe driving the Cub in a year or so. Heck, I was driving an H at 10!

My twin boys were riding Yamaha mini Enduro's at 5 yrs old, and they helped put it together as it was a "parts bike"
7 and 9 are not too young for turning wrenches!!!!!!!!!!!!
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  #26  
Old 11-08-2021, 12:31 PM
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Okay, over the weekend I adjusted the valves and gave it a try starting. Pretty much the same result - it still hangs up on the compression stroke. I've decided to rebuild the S/G and buy a 450 CCA battery to see if that will make a difference. Also, I noticed that the pulleys on the two S/G's I have are different. The one on the 106 (the tractor with the starting problem) is smaller in diameter than the one on the 100. I ordered a new pulley as well (larger) - maybe that's the problem. Any other suggestions?
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  #27  
Old 11-08-2021, 02:29 PM
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Is the ACR working? Is the exhaust valve slightly open on the compression stroke? Sometimes the small tab that holds the valve open is bent or broken.
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  #28  
Old 11-08-2021, 03:02 PM
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Okay, over the weekend I adjusted the valves and gave it a try starting. Pretty much the same result - it still hangs up on the compression stroke. I've decided to rebuild the S/G and buy a 450 CCA battery to see if that will make a difference. Also, I noticed that the pulleys on the two S/G's I have are different. The one on the 106 (the tractor with the starting problem) is smaller in diameter than the one on the 100. I ordered a new pulley as well (larger) - maybe that's the problem. Any other suggestions?
A smaller pulley on the starter gives more power/ less speed and vise versa with a bigger pulley.
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  #29  
Old 11-08-2021, 04:06 PM
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Is the ACR working? Is the exhaust valve slightly open on the compression stroke? Sometimes the small tab that holds the valve open is bent or broken.
Hmmm. I need to check that - can the tab be seen with the gear cover off, or will I need to pull the engine off and remove the oil pan?

Regardless, I'll try the S/G rebuild, larger pulley, and better battery first. Probably by this weekend (waiting on some parts...)
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  #30  
Old 11-08-2021, 04:13 PM
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A smaller pulley on the starter gives more power/ less speed and vise versa with a bigger pulley.
Thanks George - The old (smaller) pulley is pretty banged up anyway. A PO had rigged up a bigger diameter pulley on the crankshaft (since replaced) and was using a full size car battery for starting (I think I'm understanding that this was how he compensated for the problem I'm seeing now).

Since there's a S/G rebuild in the works now, I'll just switch out the S/G pulley as well and see what happens.
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