Topic: 4 hp firestone – Antique Outboard Motor Club,Inc

This topic has 10 replies, 4 voices, and was last updated 7 years, 9 months ago by ryanjames170.

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July 16, 2017 at 8:34 pm #7659
baron0418
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I am working on a 4 hp firestone. It runs fine at high speeds ( above start.) but wont idle worth a darn constant cough and choke ,like its lean I have cleaned the carb 3 times the idle area in particular. the adjustment needle does not seem to do anything???? Brian in Michigan 810-794-7685
July 16, 2017 at 9:50 pm #61716
frankr
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Tillotson MD carburetor? I guess you know that the skinny tube going down through the top is the idle metering jet. And there is supposed to be a gasket under it. It is what determines the amount of fuel going in at idle. And they are sensitive to dirt clogging the tiny hole. The needle controls air, not fuel. Screwing it in cuts off the air, making it richer (like backwards). Normal opening is around 1/2-3/4 turn.
July 17, 2017 at 1:08 am #61727
baron0418
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Tillotson AJ-16a I tried that, The gasket made it worse almost couldn’t start it. And the tube is clean. gonna try to find a different AJ-16a carb and try it. don’t know what else to do. Never had such a problem with a AJ carb. Or a MD for that matter dating back to the 1970s
July 17, 2017 at 1:10 am #61728
baron0418
Participant
I don’t actually have the proper gasket, Had to make one
August 12, 2017 at 5:17 pm #62927
baron0418
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Sometimes ya gotta cut your losses. Been messing with this thing since November. haven’t worked on anything for me all year. enough is enough. everything is clean,tests good, and or replaced. wont idle. Im done with it! Brian in Mich 810794-7685
August 12, 2017 at 6:13 pm #62932
baron0418
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It seems the customer still wants it fixed. Anyone have a Tillotson aj-16a carb?
August 12, 2017 at 9:26 pm #62935
garry-in-michigan
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Lifetime Member
This was used on Chryslers . . . 😕 – 🙄

This on the neutral clutch Fleetwin – handy for gaskets.

And the 14 horse Fastwen . . .

The current list on the 0551142 float bowl gasket is $5.00 – fits dozens of outboards – 😀
August 12, 2017 at 9:50 pm #62936
ryanjames170
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Exhaust ports.. check them.. chased a idle isue simular to this turned out the ports were all but plugged.
August 12, 2017 at 9:51 pm #62937
garry-in-michigan
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Lifetime Member
P.S. Of course you know you must remove the\e high speed needle valve before removing the float bowl or you may bend the needle making it hard to adjust. . . 😉
August 13, 2017 at 12:48 am #62948
baron0418
Participant
its not a MD carb. AJ-16a no high speed needle issues and no float bowl gasket but, I do see the bypass tube gasket. item #28 202946 and 551141. I will check the exhaust ports, good suggestion. I hadn’t thought of that. But if they are clogged why does the motor run so well at high speed? I checked The reeds too they were perfect.
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