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Ok my 5.5 is only running at haft throttle when turned all the way to full no missing runs and idle is good just will not run wide open, high speed set smooth , carb was rebuilt I rechecked float level all good new coils and points compression is 85 and 90 new plugs gap set at 30 tho , the only thing that does not look right to me is time if plate only moves 3/4 to the end of plate looks like it could or should move close to the end to open carb all the way up carb has about 1/2 inch more throttle to be wide open will try to send pic any help would be appreciated.
Something has been changed on that motor. Magplate? Cam? Carburetor? That motor did not originally have a cam roller, just a metal rod. You can see the wear where it vibrated against the cam at WOT.
Your motor has the old style stamped gears, #’s 8 and 16, which can be bent or worn. Twisting the throttle with the tiller in the up position can damage them. If they are damaged, ’56 and later cast style gears and shafts will drop right in. As mentioned, gears 21 and 23 can be one tooth out of time which will prevent the mag from advancing fully Your vertical throttle shaft, #28, doesn’t have a plastic pin to break at the bottom but instead it is cast and has an ant rattle spring.
For the mag and carb to be that much retarded, I’d suspect the gear timing first.
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