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Old 03-19-2006, 07:09 PM
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Briggs Problems

OK, I have an older 5hp Briggs on a go kart of mine. The motor has good compression and stuff and we just put on another coil on from a newer 5hp Briggs without points. But today we put on the coil and drove it around for a while. Then a friend was on It and it made a loud noise and sheered a flywheel key. So we replaced it and it happened again but messed up the crank this time but we have no idea why it sheered the flywheel key. If anyone knows whats happening please let me know so I can correct it before I put in a new crank.

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Old 03-19-2006, 10:18 PM
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I don't have very good luck with Briggs engines, they tend to blow up on me. I get along better with Kohler or Tecumseh.
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Old 03-20-2006, 08:35 AM
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you might find some help here..... http://www.perr.com/forum/
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Old 03-20-2006, 11:46 AM
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Can't tell you the reason, however, if you know a good machinist, they can put in a new keyway for both your crank and wheel (180% from old ones). I had it done at a tech school, worked great and never quit. Didn't cost me anything, I figured if it became screwed up, nothing lost.

Dutch
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Old 03-21-2006, 03:23 PM
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know any jr. dragsters ? they make 5hp briggs screws I found a original 73 lil indian chopper mini bike my son & I built with a briggs raptor 3 race engine , added a tillitson carb & a 2 stage header, comps cam, ect. it fls or buy a great go cart race engine right outa the box. http://www.briggsracing.com/display/...p?docid=101243

http://www.4cycle.com/bbs/

http://www.4cycle.com/bbs/

read learn lota fun.


Mustangsaly
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Old 03-21-2006, 04:22 PM
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if it's a 5 horse Briggs industrial, they have a roller bearing on the end of the crank, it could be hanging up , pull off the crank cover and check it. could be a techumse flywheel key also, they will work but there a trapezoid rather than square, and can sheer when there not supposto
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Old 03-22-2006, 01:35 PM
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The swap to a Magnatron coil should work with no problems, so something is
binding up, or out of time. If the starter clutch (flywheel nut) is not tightened
down on the F/W enough it will slip on the taper, shearing the key. The key is soft, and is
supposed to shear if something is wrong with the engine to prevent more damage. The key only positions the flywheel at install, being tight on the taper is what keeps it from slipping.
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Old 03-23-2006, 03:47 PM
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Briggs Problems

If he had a soft key, why did it mess up the crank and flywheel. I had a 14 hp. briggs that kept shearing keys, I put a electric impact on it and tighted till it stopped turning and it quit. lol
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Old 03-24-2006, 12:12 PM
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Quote:
Originally Posted by lanierledford
If he had a soft key, why did it mess up the crank and flywheel. I had a 14 hp. briggs that kept shearing keys, I put a electric impact on it and tighted till it stopped turning and it quit. lol
Usually when the key is sheared, like if you hit a stump with a lawn mower, it will only shear it slightly because the flywheel is so tight. But if the flywheel is loose it will roll over the soft key and eventually roll over the groove on the
crank.
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