Posted by Steve@Advance on June 29, 2018 at 08:29:15 from (66.169.147.211):
In Reply to: Re: Oliver 550 Carb posted by r8f1k on June 28, 2018 at 19:30:13:
What venturi did you use? The venturi is sized to the engine displacement, was it the same as the original? Not sure what it should be, some research, calls to a carb rebuilder might get an answer.
As for timing, someone on the Oliver board below could probably answer. But I would guess probably 90% of tractors are timed by ear. Tractors are low compression, low RPM, so it's not a critical as an automotive engine.
Before starting, be sure the distributor is in good order. There needs to be very little side play in the shaft. Any wear in the bushing/bearing and the points will not stay set. Also check the centrifugal advance. The rotor should turn a few degrees in the direction of rotation, then spring back. If it's frozen, or sluggish to return, the distributor will need to come out, be disassembled, cleaned, inspected, and lubricated.
As for setting the timing by ear, at idle advance it for the fastest idle, then back it off until it starts to labor, then go about mid way. Take it for a test run, carb backfire and poor performance indicate too slow. kicking back against the starter, clatter under load is too fast.
Have you looked at the plugs since the run with the mower? The insulator should be light tan to white. If fluffy flat black, it's too rich. The puffs of black could be carbon burning out of the exhaust system. Once the mixture is right that should clear up.
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