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  #1  
Old 12-10-2008, 09:50 PM
CHUY68 CHUY68 is offline
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i need help on 12 hp briggs synchro balance engine

hi guys . i have a 12 hp synchro balanced model 281707 type 0411 briggs . engine starts right up but the whole engine vibrates like crazy , i unbolted the engine off the riding mower frame and took the pan off . i could see the side of the outer counterweight was rubbing on the side of the crankshaft gear . counter weight has a lot of movement toward the flywheel and the bottom pulleys, there is a miniature conn. rod look alike holding the weights and at the end of the rod there is nothing holding it thats where the weight movement is coming from , is there suppose to be a bolt there? at the other end of the rod there is a long bolt that thru from the outer - rod-and inner weight. but no bolt at the other end of the weight rod. i went to the part list on www.briggs & stratton and it does not show a bolt there.
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Old 12-11-2008, 07:34 PM
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paulr44 paulr44 is offline
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I couldn't find an exact pic of your model & type engine, but perhaps this will help:
http://www.tpub.com/content/recovery...01-14P_264.htm
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Old 12-11-2008, 08:58 PM
CHUY68 CHUY68 is offline
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thanks paulr44 , on the illustrations you sent me they dont show a bolt holding the other end of the counterweight link. i probably just need the whole counterweight assembly since they are showing some wear where the weight rubs on crankshaft. where is a good place to buy this parts? anybody out here got a counterweight assembly for sale???
thanks for your time
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Old 12-13-2008, 09:34 AM
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30yearTech 30yearTech is offline
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If there is wear on the counter weights, there probably is also wear on the crankshaft bearings that operate the weights. This may not be a cost effective repair for your engine.

You can order parts from many sources on line, just do a search for Briggs and Stratton parts.

You can look at an illustrated parts list for your engine here:
http://www.briggsandstratton.com/mai...nav3&subMenu=3

Just use your model number and the first 4 digits of your type number to locate your engine.
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Old 12-13-2008, 05:35 PM
CHUY68 CHUY68 is offline
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Hi Guys , Thank You For Your Time On Answering My Question , Im Wondering If I Take The Whole Counterweight Assembly Completely Off The Engine, And Run It Without It. What Do You Think? There Is Wear To Where The Counterweghts Hangs On The Cranckshaft, (maybe The Bearings U R Talking About 30yeartech.)
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Old 12-13-2008, 11:26 PM
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I have never run a syncro balanced engine without the counter weights. I suspect it will vibrate about as bad as with the weights in their current condition. You will however not have to worry about the weights slinging loose and blowing the bottom of your engine out!
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Old 12-14-2008, 05:43 PM
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I've seen Kohler M16's run without the balance gears - not terrible but noticeable. Never ran a briggs without it..
Paul
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