YFA starting problom.
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Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
YFA starting problom.
I got a Manual choked YFA that I recently rebuilt due to a stumbling idle. That fixed that problom now I got another.
It is a hard starter now. Takes alot of pumping and full choke to get it to start. Once it starts it is a good smooth idle and I can actulay break choke earlier then before. I live in ND and -35 is not that strange to see in the winter.
The only things I did differently is I installed "standards" leak preventing gasket on the accelerator pump and used the original accelerator pump weight as the replacement was considerably smaller/lighter.
I dont think it has insufficent fuel as romping on it causes no unusual bog.
Any ideas?
Yes, the idle mix is set right.
It is a hard starter now. Takes alot of pumping and full choke to get it to start. Once it starts it is a good smooth idle and I can actulay break choke earlier then before. I live in ND and -35 is not that strange to see in the winter.
The only things I did differently is I installed "standards" leak preventing gasket on the accelerator pump and used the original accelerator pump weight as the replacement was considerably smaller/lighter.
I dont think it has insufficent fuel as romping on it causes no unusual bog.
Any ideas?
Yes, the idle mix is set right.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I think you're fine on the weight you used because all it's really supposed to do is press the check ball against the accelerator pump discharge port to keep air from getting sucked into the accelerator pump chamber when the pedal comes back up. I think it's safe to say it's not a variable that you have to fight.
Typically you should only have to pump the pedal once to get it to fire. Pumping the pedal isn't necessarily intended to "prime" the engine as many people seem to say; its purpose is to simply open the throttle and un-pin the fast idle linkage so that the choke can snap shut (or in the case of a manual choke, allow you to shut it yourself). So it's possible that pumping the pedal multiple times is exacerbating the problem.
I'd see if you're losing the fuel in the bowl while it sits. Unfortunately you can't remove the air horn of the YFA with it still on the engine.
Typically you should only have to pump the pedal once to get it to fire. Pumping the pedal isn't necessarily intended to "prime" the engine as many people seem to say; its purpose is to simply open the throttle and un-pin the fast idle linkage so that the choke can snap shut (or in the case of a manual choke, allow you to shut it yourself). So it's possible that pumping the pedal multiple times is exacerbating the problem.
I'd see if you're losing the fuel in the bowl while it sits. Unfortunately you can't remove the air horn of the YFA with it still on the engine.
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Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
Nailed it tonight. The linkage to the accelerator pump was not attached!
Hooked it up and bam, it works good.
What amazes me is that it had barely any lag when romping on it and meetered fuel fine to 60mph in 4th!
The YFA had always been a love hate relasionship with me. The things never seem 100% for long, but always work.
Go figure.
Hooked it up and bam, it works good.
What amazes me is that it had barely any lag when romping on it and meetered fuel fine to 60mph in 4th!
The YFA had always been a love hate relasionship with me. The things never seem 100% for long, but always work.
Go figure.
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