dave i used to compete in mtb races and do my own mech work so i'll try and give you a hand as best i can. its possible the chain is not good but you said the bikes are fairly new. are these bikes full suspension, front suspension or rigid(no suspension)? if they're full suspension the "skipping" can be fairly common especially when pedaling hard and standing up as you compress the rear shock it will give the chain slack and may cause it to skip. assuming the rear shock is a coil-over type you can tighten it up some to take out some of the slack when the shock compresses. also check to see if the drive line is not too far out of line while shifting gears and while in each gear. you will need to hold the bike up to do this or turn it over on the seat. if you can't figure out if the driveline is correct you may need to find a bike mech and they can put in on a bike work stand. they can also check the chain/sprockets with a special tool for wear.
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Today's Featured Article - History of the Nuffield Tractor: Part 2 - by Anthony West. In February 1953 production of the ETC T.V.O engine started, ready for the March 1953 press announcements. The new TVO engine had a number of improvements which resulted in a 10 per cent more power (43bhp as against 38 bhp on the earlier engine) and 10 per cent more fuel economy. Some of the improvements are listed below: Redesigned combustion chamber, improved spark plugs and positioning, plug size 14mm(earlier size 18mm).
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