Geo-TH,In
Well-known Member
B&D posted, Single carb supplying an odd fire engine will always run one cylinder leaner than the other. It's the nature of the beast.
For 6 years now I been looking for the solution. Why is it the nature of the beast?
Later today, I plan to do another compression test and leak down test.
I got a tack that I can replace the battery. Yesterday, while the tractor was running at different speeds I measured left and right head temps at the same place and exhaust temps.
The exhaust temps were within 2 degrees of each other, while at all speeds up to 2600 RPM's, the left cylinder runs 50 degrees cooler than the right. The left cylinder makes small amounts of carbon on top of piston and head. Right cylinder runs clean. The tip of the plug stays clean after switching to the next hotter plug 6 years ago. So how can the exhaust temps be the same, while one head is 50 degrees cooler?
I have eliminated spark plug and ignition coils (ign modules) as the problem. Hydraulic valve lifters. All new filters. Starts and runs just fine. Engine doesn't use a drop of oil. All cooling fins are clean.
I bought the engine with 400 hrs on it. Currently have 1600 hrs. Engine runs strong. I would love to find the solution.
If you google air cooled engines with one cylinder running hotter you will find I'm not alone. No one seems to know why. NATURE OF THE BEAST.
For 6 years now I been looking for the solution. Why is it the nature of the beast?
Later today, I plan to do another compression test and leak down test.
I got a tack that I can replace the battery. Yesterday, while the tractor was running at different speeds I measured left and right head temps at the same place and exhaust temps.
The exhaust temps were within 2 degrees of each other, while at all speeds up to 2600 RPM's, the left cylinder runs 50 degrees cooler than the right. The left cylinder makes small amounts of carbon on top of piston and head. Right cylinder runs clean. The tip of the plug stays clean after switching to the next hotter plug 6 years ago. So how can the exhaust temps be the same, while one head is 50 degrees cooler?
I have eliminated spark plug and ignition coils (ign modules) as the problem. Hydraulic valve lifters. All new filters. Starts and runs just fine. Engine doesn't use a drop of oil. All cooling fins are clean.
I bought the engine with 400 hrs on it. Currently have 1600 hrs. Engine runs strong. I would love to find the solution.
If you google air cooled engines with one cylinder running hotter you will find I'm not alone. No one seems to know why. NATURE OF THE BEAST.