I changed the oil and put fresh gas in the repowered tractor and let my mom use it to mow her lawn around the house. She really likes it, it's small and has a sharp turning radius, and she can get to places on her lawn that her big GT18 can't. But the engine is tired--after running for about 30 minutes it doesn't want to run anymore. It also had a crack in the gas tank that left a mess on the ground whenever we parked it...
I could never get the other MF-7 to start--it gets spark, but when it's turning with the plug in it pauses for a moment every second turn--I tried all the usual things--cleaned the carb, put carb cleaner down the spark plug hole, etc. but no go... I even pulled the flywheel and cleaned and set the points.
So, I finally decided to repower at least one of them.
I considered using one of the Chinese Clones, but I thought the 6.5 hp might not have enough torque, and the 9 hp models at HF didn't have electric start. Home Depot sells some Chinese closes as well as eBay, but I was generally looking at over $350 by the time I paid for freight, etc.
I finally found a brand new, never used Tecumseh OHM-9 OHV engine on a local classifieds. The guy wanted $200--a reasonable price I felt. I went over to look at it and took measurements--crankshaft diameter was correct (1"), mounting holes in the same place; heigth and width were okay... so I bought it.
I got it home, and discovered a few things..
1. The big wrap around gas tank stuck out too far on the left side; ditto for the square plastic air cleaner. The exhaust was okay as far as size, but it would have exited under the hood... not a good idea.
2. The battery can be put back in it's original place, but there's no place for a fuel tank. One option for the battery would be to put it at the front of the engine below the carburetor. I know batteries give off explosive hydrogen gas when charging... does anyone know if this location would be a problem?
3. If I can't put the battery in front of the engine, it will have to share space with the fuel tank... The little red half gallon tank I used to break in the engine will just barely fit under the hood, leaving about 4 inches to one side--maybe enough room to put in a motorcycle-sized battery... whaddya think??
Edited by Utah Smitty, June 22, 2012 - 11:42 PM.