Lots of good replies. Thanks. I am surprised no one suggested the High Milage oil. Would it solve one problem and cause another? I thought it may be an overall benefit.
This machine has been a work horse and I suspect it still will be. The carb is a fixed jet. The high speed is set to 3600 RPM. I believe that is the spec. I just cleaned the carb and we will see if it fixed a lean condition which may be contributing to the red muffler. I checked the valve clearances and they are in the .004 to .010 spec. A few years ago the ex valve was too tight , at zero. I opened it up and lapped the valve by hand. As best I could. That is when I noticed the worn guide. I believe they are machined into the block. I do not think they are a pressed in steel instert. To install a guide I would have to get it reamed oversize to press in the guide. I never found any when I looked. I did see over sized valves. But they were discontinuted.
I assume this machine will last a lot longer with some love. I always thought these burn a bit of oil. The plug is always a bit dark. i.e. oil burning and you smell like you ran a 2 cycle. Work hourse engines and will start in very cold weather. I am not overly concerned about the oil burning. As long as it does not foul the plugs. I will have to keep an eye on that. I am more concerned aobut the red muffler which may have been mostly from a lean condition. If the valve is not always seating well it may cause the red muffler as well and throw some sparks. I am not sure any kind of oil may help with that, but I am asking because you guys know more than I.
This machine has been a work horse and I suspect it still will be. The carb is a fixed jet. The high speed is set to 3600 RPM. I believe that is the spec. I just cleaned the carb and we will see if it fixed a lean condition which may be contributing to the red muffler. I checked the valve clearances and they are in the .004 to .010 spec. A few years ago the ex valve was too tight , at zero. I opened it up and lapped the valve by hand. As best I could. That is when I noticed the worn guide. I believe they are machined into the block. I do not think they are a pressed in steel instert. To install a guide I would have to get it reamed oversize to press in the guide. I never found any when I looked. I did see over sized valves. But they were discontinuted.
I assume this machine will last a lot longer with some love. I always thought these burn a bit of oil. The plug is always a bit dark. i.e. oil burning and you smell like you ran a 2 cycle. Work hourse engines and will start in very cold weather. I am not overly concerned about the oil burning. As long as it does not foul the plugs. I will have to keep an eye on that. I am more concerned aobut the red muffler which may have been mostly from a lean condition. If the valve is not always seating well it may cause the red muffler as well and throw some sparks. I am not sure any kind of oil may help with that, but I am asking because you guys know more than I.