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Junk collector
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632 Posts
Discussion Starter · #1 ·
One step forward and two steps back. Today I tried to start my B&S 5hp horizontal on my tiller and its now "coughing" back through the carburetor. Its not backfiring as its not hitting at all, it seems to be coughing compression out through the carb. I'm thinking I have a burned intake valve thats not seating all the way or leaking. After I rebuilt the carb it seemed to be running ok, as well as a tired 21 year old engine can. Does this seem plausible? Any other suggestions?
 

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Junk collector
Joined
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632 Posts
Discussion Starter · #3 ·
Thanks, I'll give it a try. One of my buds says it could be a sheared flywheel key or a bad spark plug. While anything's possible do these seem likely in this case?
 

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Junk collector
Joined
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632 Posts
Discussion Starter · #7 ·
Last weekend I took the engine apart. The valves were very dirty, I cleaned them off and lapped them. They now seem to seat alot better than they did, I also cleaned out the cylinder head. I didn't see any obvious problems. Hopefully it will start and run alot better once I get the new head gasket.
 

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Junk collector
Joined
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632 Posts
Discussion Starter · #9 ·
I got the engine assembled and mounted on the tiller on monday. It started and ran, unfortunately it doesn't run very well because I still can't figure out how the stupid spring that goes from the throttle control to the governor arm goes back on. I have no throttle control and the governor just kind of does its own thing. The B&S manual only has "typical" pictures so its going to be a matter of trial and (mostly) error. Maybe by next spring I'll have it figured out.:banghead3
 
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