4 hp firestone

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Baron0418
Posts: 55
Joined: Sun Apr 03, 2016 7:33 pm

4 hp firestone

Postby Baron0418 » Sun Jul 16, 2017 4:34 pm

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

FrankR
Posts: 2687
Joined: Tue Mar 10, 2015 6:32 pm
Location: Florida

Re: 4 hp firestone

Postby FrankR » Sun Jul 16, 2017 5:50 pm

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.

Baron0418
Posts: 55
Joined: Sun Apr 03, 2016 7:33 pm

Re: 4 hp firestone

Postby Baron0418 » Sun Jul 16, 2017 9:08 pm

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

Baron0418
Posts: 55
Joined: Sun Apr 03, 2016 7:33 pm

Re: 4 hp firestone

Postby Baron0418 » Sun Jul 16, 2017 9:10 pm

I don't actually have the proper gasket, Had to make one

Baron0418
Posts: 55
Joined: Sun Apr 03, 2016 7:33 pm

Re: 4 hp firestone

Postby Baron0418 » Sat Aug 12, 2017 1:17 pm

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

Baron0418
Posts: 55
Joined: Sun Apr 03, 2016 7:33 pm

Re: 4 hp firestone

Postby Baron0418 » Sat Aug 12, 2017 2:13 pm

It seems the customer still wants it fixed. Anyone have a Tillotson aj-16a carb?

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Garry in Tampa
Posts: 2061
Joined: Mon Mar 09, 2015 2:32 pm
Location: Florida

Re: 4 hp firestone

Postby Garry in Tampa » Sat Aug 12, 2017 5:26 pm

This was used on Chryslers . . . :? - :roll:
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This on the neutral clutch Fleetwin - handy for gaskets.
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And the 14 horse Fastwen . . .
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The current list on the 0551142 float bowl gasket is $5.00 - fits dozens of outboards - :D
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ryanjames170
Posts: 107
Joined: Tue Aug 01, 2017 12:19 am
Location: Hayward WI

Re: 4 hp firestone

Postby ryanjames170 » Sat Aug 12, 2017 5:50 pm

Exhaust ports.. check them.. chased a idle isue simular to this turned out the ports were all but plugged.
Mercury/OMC guy..

3 Merc's
4 johnson's
1 Hiawatha/Gale

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Garry in Tampa
Posts: 2061
Joined: Mon Mar 09, 2015 2:32 pm
Location: Florida

Re: 4 hp firestone

Postby Garry in Tampa » Sat Aug 12, 2017 5:51 pm

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. . . ;)
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Baron0418
Posts: 55
Joined: Sun Apr 03, 2016 7:33 pm

Re: 4 hp firestone

Postby Baron0418 » Sat Aug 12, 2017 8:48 pm

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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