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GCV 160
by NormK - 11/11/25 08:22 AM
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Joined: Nov 2022
Posts: 1
Novice
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I have a B&S 17.5 hp twin cylinder riding lawn mower that I cannot start because the starter cannot overcome the engine's compression stroke. I suspect the compression release valve and loose valve clearances but I cannot find where to adjust. I have removed a small plate to expose valve stems but no adjustment. Help?
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Joined: Jul 2018
Posts: 2,101 Likes: 81
SENIOR TECHNICIAN
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Unfortunately if the release has gone (and its one of their common downfalls) its on the cam gear - ie you have to tear the motor down to put in a new camshaft/gear assembly.
Hopefully its just the valve clearances too loose.
for starters, could you please post a couple photos of the motor and the model type code number. it could be on top of one of the valve cover (if its OHV which I hope it is) or somewhere on the metal cowl (if its one of the old opposed boxer motors)
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Joined: Jan 2016
Posts: 8,124 Likes: 231
SENIOR TECHNICIAN
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If I was stuck with this situation I would be seeing if I could fit a PT decomp valve to each cylinder Bitch of a job but better than stripping the motor down. Are you sure the battery and starter motor are in good condition?
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