if putting more fuel to it doesnt help, and your valve lash is good,(not too tight) i would start looking at ignition timing and valve timing after running a compression test. being a fresh motor and not having the rings seated yet, i would expect cylinder pressures to be anywhere from say 90 to 130 psi, all should be within 10-15% of each other. if that checks out, try resetting the timing by "ear", ie give it a little advance till you get a high idle and then back it off a tad, then see if you have a power increase. if so, look to the distributor/timing for a problem. last would be camshaft/valve timing. could be the gear is off a tooth or so. dont run too much advance on the timing, you could start preignition pinging (thats not good).
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Today's Featured Article - Preventing Tractor Theft - by Staff. The discussion started with the following message: I have a JD A without key start or any locking device. Is there a best way to secure it so the chances of it being stolen are reduced? Following are some of the answers that were received: Take the rotor out of the distributor and hide after each use. The would-be thieves at least couldn't just get on and drive away.
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