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Garden Tractors Discussion Forum

Re: compression!!!

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05-30-2013 14:40:17

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Try adjusting the valves again. If the exhaust valve isn"t adjusted properly, the compression relief doesn"t work properly. If it"s within spec"s, the compression relief has likely broken on the camshaft. You"ll have to split the cases and check it. Some of the Briggs engines have plastic camshafts and don"t last too long

Hope this helps.


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05-30-2013 16:51:36

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 Re: compression!!! in reply to 69val6, 05-30-2013 14:40:17  
just went out and re-set valves just in case they may have been off, and no luck. I can hand spin it backwards about a turn or so and then hit the key, and it will spin past compression and start right up, but if it is close to compression at first, it will not turn past. this is on a 2011 craftsman mower that looks it is brand new. it cant have more than 20 or so hours on it. Surely the acr on the cam is not bad already. is it possible for them to stick?

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05-30-2013 17:10:32

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 Re: compression!!! in reply to bdunegan, 05-30-2013 16:51:36  
Try shorting the starter, bypassing the switch, I am guessing a bad solenoid.(Too much resistance)

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05-30-2013 17:37:19

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 Re: compression!!! in reply to 504-1, 05-30-2013 17:10:32  
I tried that one too. i went directly to starter using heavy cables from another runing mower. still no luck but thanks for the input. this one has me flubbered!

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05-31-2013 04:52:25

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 Re: compression!!! in reply to bdunegan, 05-30-2013 17:37:19  
I have a friend that works for a company that does warranty and repairs for Sears. He says this is a fairly common thing on the large single cylinder B/S like yours. He said some of them don"t get 10 hours before this happens. It is the acr on the cam.

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