this is a 42"MTD lawn tractor with a 16.5 hp twin cylinder ,L head series series 420000 Briggs and Stratton this is a link to the engine: [url=http://www.briggsandstratton.com/us/en/support/manuals/results?NTT=42a707-2238-e1]Results[/url] I want to adjust the valves but can't figure out how to access the adjustments like on a single cylinder engine where you take the cover off the front of motor and the rockers are right there. on this motor there are 2 small valve covers , when you take them off you can only see the end of the valves.

I replaced the transmission on a 2007 Recycler along with a new belt. I can pull the lawn-mower in reverse and hear the transmission turning. I can push it forward and do not hear the transmission turning. When I push the handle, the mower does not self-propel. Each wheel gear is marked with an L on one side and an R on the other. I've tried different orientations without success. The the wheel gears are currently positioned on the axle where each one has the L on the left side and the R on the right side as you stand behind the mower. The axle keys are placed in the axle groove with the curved side into the groove and the small spring in place. I can observe the transmission creating tension on the belt when the slide handle is depressed. The mower cuts grass fine.....just no self propel. At one point after switching gears around, I had the mower go in reverse when I pressed the slide handle. That was scary but it was the only time I was able to get the transmission to move the mower. I am out of ideas.