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Old 08-30-2012, 08:35 PM
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Default Flywheel got stuck

I just got a new mini bike with a 5 hp briggs. I was riding it down the street when the motor stopped. I went to pull start it but the starter was jammed. When i got home i took off the starter cover and tried to turn the flywheel but it was stuck. Anyone have any ideas of what happened ?
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Old 08-30-2012, 08:45 PM
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Was the engine filled to the correct level with the proper grade oil?
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Old 08-30-2012, 08:52 PM
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Im not sure according to the guy i bought it from , he changed the oil, ignition , filter and spark plug.
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Old 08-30-2012, 09:19 PM
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u called it r97 ,i took off the head and the piston is seized. it had some oil but it was black
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Old 08-30-2012, 10:39 PM
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Quote:
Originally Posted by tundrabeagle3 View Post
u called it r97 ,i took off the head and the piston is seized. it had some oil but it was black
Something real easy you could try is pouring some penetrating oil in around the edge of the piston and let it sit overnight, so it seeps down past the rings.

Then the next day, use a hammer and a piece of wood like 2x2 to drive the piston down. Just start out tapping lightly, all the way around the pistons edge.

Once you get the piston down, you'll be able to see if the cylinder wall is seriously damaged or not. You might be able to just clean it up with some steel-wool, blow/flush all the debris out, wipe some fresh motor oil on the cylinder wall, change your oil, and get another 10 years of use outta that engine... I've fixed several seized pistons like this
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Old 08-30-2012, 10:45 PM
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He's dead right, this should be an easy fix, depending on how long it had been running. If it was only a minute or two you'll be ok.

The lesson here is never take what the seller says as gospel, always check for yourself
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Old 08-31-2012, 12:19 PM
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i had the piston soak in wd 40 over night then tried hitting it with a rubber mallet and it wouldnt budge. then i put a steering wheel puller on top of the cylinder and ended up punching a hole in the piston. it is set a tdc and will not budge i also have a clutch rusted onto the crankshaft that is keeping me from opening the case. i have another identical 5 hp briggs that i can get a piston out of i just need to find a way to get the clutch off. i rented a gear puller and it ended up being to big, i also read that gear pullers will ruin the clutch. is there any way i can get the clutch off without ruining it?
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Old 08-31-2012, 08:24 PM
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Quote:
Originally Posted by tundrabeagle3 View Post
i had the piston soak in wd 40 over night then tried hitting it with a rubber mallet and it wouldnt budge. then i put a steering wheel puller on top of the cylinder and ended up punching a hole in the piston. it is set a tdc and will not budge i also have a clutch rusted onto the crankshaft that is keeping me from opening the case. i have another identical 5 hp briggs that i can get a piston out of i just need to find a way to get the clutch off. i rented a gear puller and it ended up being to big, i also read that gear pullers will ruin the clutch. is there any way i can get the clutch off without ruining it?
WD40 has a lot of uses but, this ain't one of 'em. you need something with a bit more substance; used engine oil should do it.

If you have another engine why aren't you using it? If it runs, just swap the engines. If it doesn't, what's wrong with it?
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Old 08-31-2012, 08:28 PM
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Trans fluid works, Dextron or Mercon.
Watch crankcase level to see if it's seeping through.
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Old 09-01-2012, 04:32 PM
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i used a pulley puller and bearing puller to get the clutch off. the clutch bushing stayed on the crank. i used the other engine block, piston and rod and switched flywheels, crankshaft, carb and ignition. it started on the 1st pull. then i had to hammer the clutch back on to the bushing with a rubber mallot to use the same clutch.
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Old 09-01-2012, 08:31 PM
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Good stuff

Not too sure about the clutch though...
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Old 09-01-2012, 08:48 PM
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thanks the clutch works good but its just going to be a pain if i ever have to open up the case
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