1990 Briggs & Stratton 18hp


Old 08-24-11, 03:58 PM
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Join Date: Aug 2011
Location: usa
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1990 Briggs & Stratton 18hp

I have a montgomery wards signature 2000 elite (1990)
BS 18hp mod3 422707 type 1510 01, starting problems
the motor turns over very hard it really does not make a full revolution then stops. i have removed the plugs and it turns over very well when the plugs are in its hard. when i put my thumbs over the plug holes it binds. I did a compression test today and they are both at 120psi. I bypassed the starter selinoid and went directly to the ground and positive at the starter with jumper cables (car off) same problem. I do have spark at both plug wires. the guy i got it from told me the oil had not been changed in a very very long time but i checked it and it looked clean. the drive belt is loose but not off i can move it freely. he also told me that the belt pulley broke and had it re welded back on. i checked the flywheel key way it looks fine
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Old 08-24-11, 07:13 PM
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Join Date: Jul 2001
Location: USA
Posts: 16,815
Sounds like the starter end cap bushing is worn (common problem with that starter). It allows the armature to scrub the internal field magnets and create a lot of drag. Otherwise, it could be a bad battery cable connection.
Old 08-24-11, 09:06 PM
Join Date: Oct 2007
Location: ontario,canada
Posts: 325
you need the biggest cold cranking amps battery you can get for that engine. I have a 340 in mine

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