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Assuming the individual axles turn freely without side rods attached, the problem is most likely with poor fitting side rods or out-of-quarter drivers ( cranks on this model). Does the engine roll smoothly when you push it back and forth by hand without the motor installed? Try doing this while leaving one or two driver sets off (and various combinations of "installed" drivers). <br /> <br />MDC should have designed the kit so the holes in the side rods match the axle slot spacing in the frame, but it wouldn't hurt to verify this. Be sure to carefully smooth the sharp edges found on one side of the side rods (this is an artifact of the punching process). Also, the side rod holes should be just large enough to slip over the crank pins (if the holes are too large the drivers can get out of sync). <br /> <br />Make sure the "quartering" of the cranks on all axles match exactly (this is easy to say, but not so easy to do). A perfect 90 degrees is not necessary but consistency of all axles is necessary. The cranks on this model are add-on parts and they may be twisting as the engine is running (i.e. the drivers are dynamically going out of quarter). Can you detect any movement if you grab the drivers by the cranks and gently twist them?
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