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I've got a 94 Mach Z and finally got it out for a run yesterday at Haliburton Forest. It seemed to be running on only two cylinders a lot of the time. Changed the plugs but didn't make a difference. Any suggetions on what to check first?
Thanks
 

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stevpaw: Which cylinders are running, Mine always fouled the centre. Make sure that the enrichment valves are all closing after you start,that is if yours had that update done. Dino
 

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Another problem that can happen is your choke cable.  If you take your airbox out watch for the choke cable when you put it back in.   If you stretch the cable it can pull the plastic piece out  of the choke behind the plunger.   This happens quite often, and it will foul plugs right away.
 
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