CallMeCHaz
Forum Newbie
- Joined
- Sep 2, 2022
- Threads
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- 5
SV-725 Courage.
Adjusted valves after repairing leaking valve covers. .004/006. Torqued lock screws to 70 in-lb.
Washed oil off of engine with garden hose. Covered carb with plastic bag. No forced spray above bottom of flywheel (did not blast coils).
Ran fine for about 2 minutes. Started loud "popping" (almost a banging sound like a severe miss/backfire) and lost power. Popping is coming from small port pointing downward next to exhaust port on engine (compression release?), right side only. Every time it pops there is a definite puff of air coming from the port.
Pops are very rhythmic--not a rapid-staccato like a wet ignition. More than one pop per second at idle, 2-3 per second at full speed. Feels like a severe miss--you can feel it through the entire mower. Pop...pop...pop.
I hate to pull the valve cover right off to check the valves. Any ideas. First question: is the port a compression release? If so, what could be triggering it in such a rhythmic pattern. If that cylinder were missing, would the port be popping in response? Or is the port a compression release that is popping open?
A miss? Maybe water got in a fuel line? Ignition miss? Or did a valve adjustment slip? I read somewhere that valves out of adjustment can affect the compression release (usually not letting it open.) Thoughts are appreciated before I dive back in tomorrow!
Adjusted valves after repairing leaking valve covers. .004/006. Torqued lock screws to 70 in-lb.
Washed oil off of engine with garden hose. Covered carb with plastic bag. No forced spray above bottom of flywheel (did not blast coils).
Ran fine for about 2 minutes. Started loud "popping" (almost a banging sound like a severe miss/backfire) and lost power. Popping is coming from small port pointing downward next to exhaust port on engine (compression release?), right side only. Every time it pops there is a definite puff of air coming from the port.
Pops are very rhythmic--not a rapid-staccato like a wet ignition. More than one pop per second at idle, 2-3 per second at full speed. Feels like a severe miss--you can feel it through the entire mower. Pop...pop...pop.
I hate to pull the valve cover right off to check the valves. Any ideas. First question: is the port a compression release? If so, what could be triggering it in such a rhythmic pattern. If that cylinder were missing, would the port be popping in response? Or is the port a compression release that is popping open?
A miss? Maybe water got in a fuel line? Ignition miss? Or did a valve adjustment slip? I read somewhere that valves out of adjustment can affect the compression release (usually not letting it open.) Thoughts are appreciated before I dive back in tomorrow!