4 hp firestone

Outboard Related Only
Baron0418
Posts: 43
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: 2581
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: 43
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: 43
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


Return to “Ask A Member”

Who is online

Users browsing this forum: Garry in Tampa and 10 guests