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Minneapolis Moline Tractors Discussion Forum
Show Parts for Model:

carb icing

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jack bycraft

07-14-2014 14:13:58
207.61.178.139



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Entered a fun pull at local heritage show Saturday, was going pretty good till about 80 to 100 feet then carb ice took over and power gone. This is the second time with my Jetstar Two gas. Any thoughts on how to avoid or rectify. jack




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jack bycraft

07-16-2014 06:27:07
207.61.178.139



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 Re: carb icing in reply to jack bycraft, 07-14-2014 14:13:58  
no it doesn't have a LP manifold.
yes it was fairly humid but not really oppressive.
has the standard Jetstar carb no mods, ran it on the dyno next day no sensitivity to power jet adjustments.
tractor planted 200 acres of beans this year no problem.
considering Zenith carb from Yesterdays Tractors. good idea? Listed for U302.
35 years aviation familiar with carb heat, don't think a good idea for dusty work. jack

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MMperson

07-20-2014 07:22:43
38.123.17.102



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 Re: carb icing in reply to jack bycraft, 07-16-2014 06:27:07  
Stay away from the Zenith carbs. You will not be happy with the loss of power and the work it will take to make it fit. (been there, done that)



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David G

07-16-2014 06:58:11
205.215.206.18



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 Re: carb icing in reply to jack bycraft, 07-16-2014 06:27:07  
My MH44 with carb was real bad about icing on humid days. Getting the manifold up to temp quickly is the solution. Once the manifold is hot it should be OK.

I have found a thermostat helps, maybe pre-warming the manifold with a heat gun if you are doing short runs.



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t.r.k.

07-14-2014 19:32:58
71.31.64.233



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 Re: carb icing in reply to jack bycraft, 07-14-2014 14:13:58  
You don't have that carburetor on a Lp manifold, do you?
The truth is, I don't know if a Lp manifold was offered for the OHV 206, but there was a separate Lp manifold for all the older Lp MM tractors.

The reason I am asking is most gasoline manifolds are designed to transfer exhaust heat to the intake manifold to combat icing. The regular Jetstar manifold acutually bolts the two together just above the carburetor.

Most Lp manifolds do not have any connection between the intake and exhaust manifolds, to keep the Lp gas as cool as possible before it enters the cylinder.

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David G

07-14-2014 19:35:16
205.215.206.18



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 Re: carb icing in reply to t.r.k., 07-14-2014 19:32:58  
Pullers will sometimes run a LP manifold to gain a LITTLE HP, I was thinking the same thing.



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David G

07-14-2014 15:56:57
205.215.206.18



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 Re: carb icing in reply to jack bycraft, 07-14-2014 14:13:58  
What is temp and humidity?



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allis fields

07-14-2014 20:22:07
71.13.136.66



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 Re: carb icing in reply to David G, 07-14-2014 15:56:57  
You need a bigger carb or bigger venturi. It is icing up from the fast air flow.



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