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Hello all. I am posting this here in hopes of resolving an issue with an older mower.
Mower: MTD mower, about 10 years old, 5 HP Briggs and Stratton 12V802 model engine (type 2376-A1), part of the 12v800 model series, adjustable throttle.
Components recently replaced so far:
+ Oil
+ Spark Plug
+ Air Filter
+ Mower’s blade
+ Fuel line (no inline filter– there was none originally)
+ Brand new carburetor installed (is there a break-in procedure for these?)
Problem: After running between any where 30 seconds to 2 minutes the engine will surge (it makes no difference if the mower is stationary or in motion – i.e. pushed around). It runs but it does not maintain a constant speed – it seems to be “hunting” for a speed.
Turning off the engine and letting it rest for a few minutes seems to allow it run for a about a minute without the surging problem and then it begins surging again.
When the surging begins, the governor can be observed moving around. It never kills the engine although sometimes it sounds close to it. Sometimes when this surging occurs there is a metallic sound (maybe something against the fly wheel?) that can be heard.
I read over the following post but I don’t believe the problem is the same here because the carburetor is new.
I have checked the fuel cap and it seems OK. I have tried loosing it when the surging begins to see if it is a venting issue. No difference.
Maybe this is the issue, as noted by hardboiled in http://www.lawnserviceforum.com/showthread.php?t=17806 :
“Something unrelated that may mess with your speed governing is debris under the shroud around the flywheel. A mouse nest, grass and dirt, etc. Blow out the cylinder and head fin area and under the shroud with compressed air. That should be part of your regular maintenance. There is a blade hooked to the carb linkage that is in the airflow put out by the flywheel. Air speed off the flywheel and spring pressure on that paddle or blade regulate the throttle, so they need to be free and not hindered by debris.”
I've checked this but I'll look again for any obvious debris that might have been missed after the first cleaning attempt.
Ideas or thoughts as to how to stop the surging would be greatly appreciated. Thank you.
Mower: MTD mower, about 10 years old, 5 HP Briggs and Stratton 12V802 model engine (type 2376-A1), part of the 12v800 model series, adjustable throttle.
Components recently replaced so far:
+ Oil
+ Spark Plug
+ Air Filter
+ Mower’s blade
+ Fuel line (no inline filter– there was none originally)
+ Brand new carburetor installed (is there a break-in procedure for these?)
Problem: After running between any where 30 seconds to 2 minutes the engine will surge (it makes no difference if the mower is stationary or in motion – i.e. pushed around). It runs but it does not maintain a constant speed – it seems to be “hunting” for a speed.
Turning off the engine and letting it rest for a few minutes seems to allow it run for a about a minute without the surging problem and then it begins surging again.
When the surging begins, the governor can be observed moving around. It never kills the engine although sometimes it sounds close to it. Sometimes when this surging occurs there is a metallic sound (maybe something against the fly wheel?) that can be heard.
I read over the following post but I don’t believe the problem is the same here because the carburetor is new.
I have checked the fuel cap and it seems OK. I have tried loosing it when the surging begins to see if it is a venting issue. No difference.
Maybe this is the issue, as noted by hardboiled in http://www.lawnserviceforum.com/showthread.php?t=17806 :
“Something unrelated that may mess with your speed governing is debris under the shroud around the flywheel. A mouse nest, grass and dirt, etc. Blow out the cylinder and head fin area and under the shroud with compressed air. That should be part of your regular maintenance. There is a blade hooked to the carb linkage that is in the airflow put out by the flywheel. Air speed off the flywheel and spring pressure on that paddle or blade regulate the throttle, so they need to be free and not hindered by debris.”
I've checked this but I'll look again for any obvious debris that might have been missed after the first cleaning attempt.
Ideas or thoughts as to how to stop the surging would be greatly appreciated. Thank you.
