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Echo the above with the following 1) check that the con rods are not binding on the plastic wheel inserts. One would think that this would be constant but it is not. Dont really know why, but! 2) Check that the gear on the drive axle is centred between the wheels. This drove me batty on B1; J39, V1 etc. At the start of any session it would result in really jerky running then as the session went on it would become less when running at speed but was still pronounced at slow speeds. If this gear is not centred it moves to one side of the worm gear and every so often I suspect the worm gear misses a tooth. Once I figured out what it was I was able to cure all my jerky runners including one J39 that was close to going in the scrap bin.
 
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