sputters and sucking in through exhaust

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butchs38
Cub Star
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Zip Code: 07847
Tractors Owned: 1950 Cub
54 Blade

sputters and sucking in through exhaust

Postby butchs38 » Tue Mar 13, 2018 6:24 am

New to forum great info
I bought a 1950 cub no smoke or miss but at idle about every 5 to 10 seconds it sputters and when it does it sucks in through exhaust. High speed seems to be ok no problems under load. I checked jets all clean the guy i bought it from said he just did a tune up. What could be causing this i dont think its a burnt valve because it doesn't do it constantly. I'm thinking more in the lines of a sticky valve or weak valve springs.

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Willy
501 Club
501 Club
Posts: 518
Joined: Sun Oct 22, 2017 4:54 pm
Zip Code: 38330
Tractors Owned: 1951 Cub Lil Red
Location: Dyer, TN

Re: sputters and sucking in through exhaust

Postby Willy » Tue Mar 13, 2018 10:07 am

Mine's been doing that but it runs good, so it's something I keep an eye on just in case.
Waking up the ol' Cub

Nah, it's not leaking oil. It's just marking it's territory.

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Urbish
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Zip Code: 48158
Tractors Owned: ~
1958 International Cub LoBoy
1948 Farmall Cub
1977 International LoBoy 184
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Cub-193 Moldboard Plow
Cub-54A Leveling and Grader Blade
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Unknown 5' Single Gang Disc Harrow
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Location: Manchester, MI

Re: sputters and sucking in through exhaust

Postby Urbish » Tue Mar 13, 2018 10:16 am

I'd say sticky valve. Very easy to remove tappet cover and watch the valvetrain action while turning it over.
Jim

Circle of Safety

butchs38
Cub Star
Cub Star
Posts: 51
Joined: Tue Mar 13, 2018 6:10 am
Zip Code: 07847
Tractors Owned: 1950 Cub
54 Blade

Re: sputters and sucking in through exhaust

Postby butchs38 » Tue Mar 13, 2018 10:23 am

thanks will look into that i just check points they were off a little and coil was hooked up backwards neg to points. will post outcome.

jsfarmall
501 Club
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Posts: 604
Joined: Sat Oct 22, 2016 1:04 pm
Zip Code: 72454
Tractors Owned: 1948 Cub "Trusty"
1948 Cub "Rusty"
1948 Cub "Bob"
1948 Cub "Sallie" (wife's tractor)
1965 IH Cub "Annie"
1943 Farmall H
1953 Farmall Super M (granddad's tractor)

Re: sputters and sucking in through exhaust

Postby jsfarmall » Tue Mar 13, 2018 11:11 am

All of mine have negative post going to.distributor.
1948 Cub "Trusty"
1948 Cub "Rusty" mower tractor, trimmed ear dash
1948 Cub "Bob"
1948 Cub "Sallie"
1965 IH Cub "Annie" mower tractor,
1943 Farmall H,
1953 Farmall Super M

butchs38
Cub Star
Cub Star
Posts: 51
Joined: Tue Mar 13, 2018 6:10 am
Zip Code: 07847
Tractors Owned: 1950 Cub
54 Blade

Re: sputters and sucking in through exhaust

Postby butchs38 » Tue Mar 13, 2018 12:11 pm

from what i understand is with + ground the distributor is suppose to go to + side is this correct. anyway it still sputters must be valve related. i haven't checked for sticky valve yet

staninlowerAL
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Re: sputters and sucking in through exhaust

Postby staninlowerAL » Tue Mar 13, 2018 8:20 pm

Is the tractor pos ground or neg ground? Coil should be connected the same way as the battery.


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