|
Barry, first thing to check is that the air cleaner inner wire mesh isn't plugged with mud & old crusted oil residue. OR, just try running it with the air intake removed to see if you can feel an improvement. ~Then do a basic fuel flow test.. To do that, turn the fuel on, then open the carb�s bottom drain valve & MAKE SURE you have a pencil sized stream of fuel flowing for a good 30 seconds. If you don�t, you have probably found your problem. ~Next, make sure you are running enough ignition timing [you want about 25-30�]. If you tell me what mag you are running I will talk you through the basic mag set-up & initial timing. Late ignition timing will really cause those old Deere's to act lethargic. Maybe as a test, mark the mag to governor position with a paint mark, then loosen the mag retaining bolts & rotate the top of the mag top the rear about 3/8� to see if you get an improvement in power. If so, you probably have a basic mag internal lag angle problem or incorrect basic static mag timing. ~You need to give it a hot compression test [carb & choke wide open] ..Low compression can really lower the power output. If you have smoke coming out from behind the clutch pulley under load suspect a ring problem. ~Do the basics on the governor to carb rod adjustment.. Open the carb & hand throttle lever wide open then set the linkage rod to be 1 hole short of entering the carb lever. ~Look closely at the carb linkage rod where it enters the carb top lever,, MAKE SURE the rod cotter pin isn�t limiting the linkage travel to just part throttle [a common problem]. Make sure the throttle linkage isn�t hitting the fuel tank or tank mounting brackets. Look closely at the governor leaf spring, those tend to crack with age or get rust pitted & weak. A weak governor spring will limit full throttle under load. ~Try running it with the exhaust pipe pulled out of the muffler. Sometimes those old mufflers have an internal baffle come loose & restrict exhaust flow. ~If all above checks out ok & you are still having power problems you might pull the cylinder head & make sure the valves aren�t all coked up. Those valves tend to carbon up from oil & old fuel residue & close off the intake or exhaust seat area right off. I have seen some so bad they don�t even look like valves but more like rubber stoppers. ~I presume you have tried the simple things like opening the load needle more to see if you get a power gain? ~I don�t know how low your power is but maybe it isn�t that bad. If you have an all-fuel B they aren�t the most powerful thing in the world�. [email protected]
| 
