After the fire a couple weeks ago I have replaced a large section of the wiring harness with 12 gauge wire and everything seems to be working correctly - wiring wise.
This cub has had issues for quite a while. It would take forever to warm up and run with any kind of power, but the longer you ran it the better it would run. When warmed up it was EXTREMELY hot
and no amount of idling after use would prevent it from backfiring (very very loud backfire). This engine was rebuilt years ago and after the rebuild I had what I considered a very knowledgable
person (was the small engine man at an IH dealership for years and continues to do small engine repair from his shop) check it out due to the back firing issue. HE couldn't find an issue even after
pulling the head to make sure it didn't have an excess carbon issue. The last couple of years I used the 125 less and less.
Currently it starts extremely easy without using the choke. During the first 10 minutes of use when you set the throttle wide open it does not build up much for RPMs and is extremely under powered.
Once it has been running a while it builds some power up (a lot less than it had) but even running the deck makes the engine labor. With 10 minutes of use if you shut the deck off and let it sit in
place with the throttle wide open it finally runs at full RPMs - but has a noticeable extra backfire like noise going on and the exhaust (factory exhaust for the 125) has a consistent 2 flame.
When you start the deck the RPMs drop by 1/3 and the backfire noise goes away along with the flame. With power so low mowing is almost impossible. The backfire o shut down is not happening now.
I am assuming the exhaust valve has probably been damaged do the backfiring issue and only seals up when it gets hot. I assume the valve issue has gotten worse with time and use and it nolonger seals
up when hot. If I take it apart and check the valves anyone have an idea as to what the excessive heat issue is? I would think it has the timing to far advance but how do you fix that?
Basically I am trying to get this thing to run good enough to sell.
This cub has had issues for quite a while. It would take forever to warm up and run with any kind of power, but the longer you ran it the better it would run. When warmed up it was EXTREMELY hot
and no amount of idling after use would prevent it from backfiring (very very loud backfire). This engine was rebuilt years ago and after the rebuild I had what I considered a very knowledgable
person (was the small engine man at an IH dealership for years and continues to do small engine repair from his shop) check it out due to the back firing issue. HE couldn't find an issue even after
pulling the head to make sure it didn't have an excess carbon issue. The last couple of years I used the 125 less and less.
Currently it starts extremely easy without using the choke. During the first 10 minutes of use when you set the throttle wide open it does not build up much for RPMs and is extremely under powered.
Once it has been running a while it builds some power up (a lot less than it had) but even running the deck makes the engine labor. With 10 minutes of use if you shut the deck off and let it sit in
place with the throttle wide open it finally runs at full RPMs - but has a noticeable extra backfire like noise going on and the exhaust (factory exhaust for the 125) has a consistent 2 flame.
When you start the deck the RPMs drop by 1/3 and the backfire noise goes away along with the flame. With power so low mowing is almost impossible. The backfire o shut down is not happening now.
I am assuming the exhaust valve has probably been damaged do the backfiring issue and only seals up when it gets hot. I assume the valve issue has gotten worse with time and use and it nolonger seals
up when hot. If I take it apart and check the valves anyone have an idea as to what the excessive heat issue is? I would think it has the timing to far advance but how do you fix that?
Basically I am trying to get this thing to run good enough to sell.