Posted by Steve@Advance on June 28, 2018 at 08:03:55 from (24.182.105.179):
In Reply to: Oliver 550 Carb posted by r8f1k on June 28, 2018 at 07:16:07:
Sense you were able to get it apart without tearing the gasket, might go back in and look things over. The plastic venturi and lack of numbers could e an indication of an aftermarket carb. Not sure if a factory kit would fit exactly, so if you do get a kit, check the gaskets carefully. Don't replace anything needlessly, it may not go back the same.
Check the float carefully. Give it the shake test, listen and feel for fuel inside one of the pontoons. Float it in a pan of water, it should float equally, both pontoons the same buoyancy. Be sure it is straight and the pontoons are even with each other, not touching anything inside the bowl. I don't know the float level setting, but typically by inverting the top, the float should sit level. Usually there is a stain line where it has been sitting, get that level.
Look the seat over, if you suspect it is rough, a q-tip in a drill with lapping compound sometimes will polish one out. Be sure the needle seats before the float touches the top edge of the seat. The area around the inside of the needle/seat must be perfectly clean. I like to open the fuel valve and let the line flush before making the connection.
Look the mating surfaces of the bowl and cover, be sure they are flat and the gasket is compressing all around and especially in the middle.
Have you tried test running with the air cleaner disconnected? Sometimes they can be restricted in some unusual manner, mice nests, dirt dobbers...
I believe the idle mix adjusts backward on those, in is rich, out is lean. It adjusts air bleed, not fuel.
If it has an adjustable main jet, turn it in until it stumbles on sudden acceleration from idle. Then slowly back it out until it will take sudden throttle without hesitating. A single puff of black smoke is the goal.
Of course, the finest carb in the world won't make a sick engine run right. Be sure everything else is right, spark, timing, vacuum leaks, compression, valve lash, thermostat... If it's been running rich good chance the oil is contaminated with gas.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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