Not sure Andy
Also not sure if the tensioner above will fit a ZT400
All I know is belt squeaks like a banshee on start up and does not appear to be very tight
Dave
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I hope it works for you.
I am supprised at the 3rd belt, maybe it is slopping around and wearing?
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I still use my car for long term durability testing. It is in its second belt at 90+K miles. The front plate mount on the blower has many pulley positions on it to facilitate belt adjustment to take up any differences in belt and spring tensioner production tolerances.