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47plymouth, SRTsFZ6
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2019/04/29 22:59:10
smallmechanic

Misfiring Briggs and Stratton 5.5hp rototiller

Hi all,
New here.
I gave a rototiller that is misfiring.
I have checked the timing, got new spark plug and gapped it, also gapped magneto. I gave a new magneto arriving tomorrow. If it is not that what other thing could it be? Suggestions? Thanks.
10 comments Leave a comment
Roy
Welcome aboard. Try an inline spark tester, it will show an ignition misfire and is a lot cheaper thaan a new magneto. Also check valve clearances.
2019/04/30 00:45:07
smallmechanic
Ok will get a spark tester and YouTube the valve clearance.
2019/04/30 09:12:01
smallmechanic
Put new spark plug(ngk) and magneto. It has a really good blue spark.
Same thing. It also has fumes of unburned fuel coming out of the exhaust.
I a mb wondering it's running rich. How do I tell if it is and how can I adjust the carb? I'll try tomorrow taking of the air filter and seeing if it runs better to diagnose if it's running rich.
I have not checked valves yet.
 
2019/05/04 22:53:42
smallmechanic
Please help 36 people have looked but only one reply.
2019/05/04 22:54:42
smallmechanic
I gapped the valves. New carb, really good spark. ANY other ideas?
2019/10/27 08:30:38
smallmechanic
thanks!
2019/10/27 08:30:47
Roy
Can you post the numbers off the engine? I wonder if the valves are not seating, maybe the guides are worn. Is the new carb OEM or aftermarket?
2019/10/27 12:55:25
smallmechanic
The carb is aftermarket. Would that make it not work very well?
The model is: 126302
I have the stuff to lap the valves. Should I do it?? 
2019/10/27 19:59:16
Roy
If you want to go to that much work you could pull the head and check the valves and guides for wear. A leakdown test would be quicker if you have access to the tool and an air compressor. Is it just an annoying miss or is performance suffering?
2019/10/27 22:49:27
smallmechanic
I have an air compressor. What tool do I need?
 
Performance is suffering real bad. IT has no power. 
2019/10/28 08:11:00

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