Starting Problem

Brads

Brads

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I'm hoping for a... most likely cause I guess. Got an older Murray Lawn Tractor this summer. 20hp B&S twin. It runs terrific but has a problem when turning over to start. It acts like the timing is off or at least that's what it reminds me of. Like when you advance the timing too far in a car and try to start it. It turns over and kinda hangs up in between each cylinder. Which of course is the spark plugs firing too soon. Now this engine runs off a magneto (right?) so I figured I'd check the flywheel and see if the shear key had broke maybe. Pulled off the big nut and looked but it was OK. So... anybody have a guess?

info. new battery this summer. Starter was froze from sitting (4 yrs) but after cleaning worked well. Could it still be bad? Maybe drawing too many amps? How would you check that? Ummm, battery cables?

Thanks
 
R

Rivets

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You are going to have to adjust the valves. Post all the engine numbers and I should be able to find you a service manual.
 
briggs

briggs

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as rivets said adjust the valves
 
davbell22602

davbell22602

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If its vtwin briggs then manual part number is 273521. If its a Lhead twin then manual part number is 271172.
 
Brads

Brads

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Rivets said:
You are going to have to adjust the valves. Post all the engine numbers and I should be able to find you a service manual.
Click to expand...

Adjust the valves. Super, I can do that. :smile: OK, I looked that up on youtube.com and the guy said to pretty much set all V-Twins to .004 thousandths. Does that sound right to you?

Here's the info. you requested:
Model 460777 25C
Type 1277 01
Code 9601155B
Briggs Diamond I/C
20 hp
 
davbell22602

davbell22602

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Brads said:
Adjust the valves. Super, I can do that. :smile: OK, I looked that up on youtube.com and the guy said to pretty much set all V-Twins to .004 thousandths. Does that sound right to you?

Here's the info. you requested:
Model 460777 25C
Type 1277 01
Code 9601155B
Briggs Diamond I/C
20 hp
Click to expand...

No, My briggs vtwin manual says .004-.006 for intake valve and .007-.009 for exhaust valve. Thats not a vtwin its Lhead twin.
 
Carscw

Carscw

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Here is a good guide to go by

image-2442499740.jpg
 
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