inairam wrote:I would adjust the valves and the timing and the governor to carb linkage. If you have a tach or get an induction tach (~20 bucks on amazon) and see what the RPMs are at idle and full throttle for both cubs. Maybe the governor itself ( not just linkage) needs some adjustments but do that very last. It is also never the governor. I would also change the screen in the top of the fuel bowl, and clean the oil bowl in the air filter, check for air leaks between the cab and the manifold by spraying start fluid on the outside and listen for an RPM change. These are little things but if you are going back and forth between tractors they become noticable. I have also been having problems with IH and no names points and condensers. I started using NAPA ( I do not know where to get the equivalent in Canada)
My signature is "When you only have 9 horsepower you need to know the names of all of the ponies!" a difference in HP/performance between the cubs can be a lot of little things that are off just a little. Doing a complete comprehensive tune-up of all systems may help iron this out.
I ordered a timing light, I have a tach and the rpm seems just fine.... I definitely plan to go a little more in depth on the little things. Timing, valves and linkage is somthing I'll have to learn. It appears to have good compression but maybe the valve seats are bad in a way that makes it have less vaccume for the carb?