Zenith rebuilt. No power past 40mph

Also I noticed there is a small bit of play in the throttle shaft. However does not effect idle so I didnt think it would impact high end speed performance.
 
I can tell you that there is more to a Zenith carb than you probably think. I found out the hard way. Save time and frustration and send the carb to Renner's Corner. No I do not have ties with them but the B carb on the A touring runs great.
 
A friend had the exact same problem with a brand new Zenith of recent production. A Zenith guru checked it, found the opening in the secondary well was just a bit below specs, enlarged it slightly to bring it up to specs, that was the problem. The jets were all Ok.
 
steward614 said:
Also I noticed there is a small bit of play in the throttle shaft. However does not effect idle so I didnt think it would impact high end speed performance.
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If there is play in the shaft air will get by it. Since your's is very little you may not notice the subtle differences but there are some occurring basically when the plate is closed. Other than running erratically leaner at idle I have had the rpm's stick a little higher from these shafts being worn. Going under the hood and manually pushing it against the throttle stop screw lowers it.. This is with no linkage binding and a good return spring on the accel bracket assy. All it takes is to open the hole up with a drill bit to install the oversize shaft.. Very easy fix...
 
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