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john deere 125 starting issue

A

Anonymous-0

Well-known Member
I have a john deere 125. put in a new battery,replaced the solenoid. still no start. meaning the starter engages just not enough power to turn the motor. if u spin the motor by hand ahalf turn, it will crank right up.Whats my problem???? I have heard something about a decompression on this tractor. its a 20 hp briggs OHV. are the valves by chance out of adjustment??? how easy are they to adjust???
 
Remove spark plug(s) & crank eng,if eng won't spin freely then you have a mech problem in eng.IF eng does spin free reinstall plug(s)& crank eng if starter still stalls on compression stroke then valve clearance excessive & acr not working or possibly float valve leaking in carb flooding eng & hydrolocking piston(s),it's not a big/complicated job adjusting valve clearance BUT you should have service/repair manual for you mod eng,in manual will be instructions on how to set valves & clearances for same,you can probably get a manual for your eng at local mower shop,ebay or briggs website.Valve clearance needing an adjust every few yrs is a common problem on briggs ohv eng.
 
(quoted from post at 18:53:04 04/03/14) I have a john deere 125. put in a new battery,replaced the solenoid. still no start. meaning the starter engages just not enough power to turn the motor. if u spin the motor by hand ahalf turn, it will crank right up.Whats my problem???? I have heard something about a decompression on this tractor. its a 20 hp briggs OHV. are the valves by chance out of adjustment??? how easy are they to adjust???
Click to expand...

You can spin it by hand but the starter will not spin it?
Sounds like a starter/battery/wiring problem.
 
If that mower has the single cylinder Briggs and Stratton engine, and the starter is turning it part way around and stalling when the engine begins the compression stroke, the valves are out of adjustment. Set the valve clearance to about .004, with the piston just starting down the cylinder.
 
Check the upper starter bushing. Pull the cover or the starter, which ever is easier, feel the clearance in the bushing by moving the starter shaft side to side. Should be very little movement.
 
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