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  #1  
Old 12-23-2011, 07:29 AM
gost530 gost530 is offline
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Default Balance Gears

I know there are a lot of opinions abnout balance gears. Many recommend leaving them out, however a friend tried this option and advised that while at low rpm the engine shook so bad that he couldn,t keep the screws in the carb tight. I do see that one of the suppliers offers a counter weight which can be installed on the crank in lieu of balance gears. Does anyone have any experience with it? How difficult is it to install? Since I plan on having the crank turned would it be an option to have it balanced at that time? Thanks Gary
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Old 12-23-2011, 10:35 AM
Methos Methos is offline
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I would pull them and not put anything in their place. I don't see the point of putting something back in to blanace the crank. Maybe someone else has used them. I know lots here have pulled them and never worried about their engine again.
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Old 12-23-2011, 11:02 AM
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One shouldn't be running these air cooled engines at low speed anyway, they should be run wide open for maximum cooling. I haven't heard of anyone using an aftermarket bolt on weight here on the forum.
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Old 12-23-2011, 11:24 AM
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Donny Curtis Donny Curtis is offline
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Sounds like he has more problems other than balance gears and as for the bolt on weights, they being use in mostly pulling engines, not saying you can't use them here, I think he has other problems, could be a number of things, all the way down to the drive shaft, to even being the motor not bolted down to the frame.
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Old 12-23-2011, 11:50 AM
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Those gears earned the nickname "grenade gears" for a reason. When they go, they unfortunately usually take the block with them. Most pull them and leave them out. Alot feel they didn't help much with vibration anyway. I don't know of anyone adding balance weights to the crank. It's really up to you if you want to. Without any experience with it, I wouldn't really know what to tell you either way.
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Old 12-23-2011, 12:03 PM
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Quote:
Originally Posted by Methos View Post
I would pull them and not put anything in their place. I don't see the point of putting something back in to blanace the crank. Maybe someone else has used them. I know lots here have pulled them and never worried about their engine again.
I have actually done this static balance method and it worked just fine. I built a motor for my 124 from various parts and pieces and when I fired it up for the first time it shook so bad it was hard to keep your hands on the wheel from the vibration. I did the static balance method that Brian Miller has on his website. Actually had a phone conversation with him on how to do this. All the parts and pieces should weigh a certain amount and it turned out my crank weighed considerably less then it was suppose to. I built the weight plates and got the weight correct and viola the thing runs like the energizer bunny now.The plates were mounted to the sides of the balance lobes and the screws are red loctited.It should be noted that I have access to a full machine shop at work. And by the way I have hammered on that 124 for 3 yrs now and been to a have been half dozen plow days. Best I can tell you is put it together without the weights and see what happens. If the vibration is over the top pull it back apart and static balance it. Do not let others tell what you should or shouldn't do to your tractor. It's all a learning curve. Have fun with it
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Old 12-23-2011, 04:35 PM
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Is it worth opening up the engine only to remove the "grenade gears"?
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Old 12-23-2011, 04:40 PM
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Quote:
Originally Posted by gost530 View Post
I know there are a lot of opinions abnout balance gears. Many recommend leaving them out, however a friend tried this option and advised that while at low rpm the engine shook so bad that he couldn,t keep the screws in the carb tight. I do see that one of the suppliers offers a counter weight which can be installed on the crank in lieu of balance gears. Does anyone have any experience with it? How difficult is it to install? Since I plan on having the crank turned would it be an option to have it balanced at that time? Thanks Gary
it's easier to tighten screws than it is to replace an engine. air cooled need to run WOT. leave the balance gears out. they're a ticking time bomb!!! just my two cents worth. jeff
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Old 12-23-2011, 04:43 PM
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Originally Posted by Flatbedford View Post
Is it worth opening up the engine only to remove the "grenade gears"?
YES, the bottom one will come out no problem. make sure you get ALL the shims out. the top one will come out via a well placed chisel punch and hammer. as with the bottom one, remove all the shims and MAKE SURE TO GET ALL THE "SCHRAPNEL" OUT OF THE BLOCK!!!!! jeff
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Old 12-23-2011, 04:53 PM
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I had the engine out of my 125 last summer. Too bad I didn't know about this then.
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