High Altitude Cub... +7,000'

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High Altitude Cub... +7,000'

Postby ctatum41 » Thu Oct 04, 2018 8:43 pm

I recently inherited a 1954 Cub from Michigan (basically sea level) that has been in the family for years. Problem is I live out west at 7,300'. No problems starting it and running it but it obviously lacks power. I am looking for suggestions on gaining power back for simple around the yard chores. I see there was a high altitude head designed for the cub but doesn't seem to be readily available. Would you guys suggest decking the head? If so, any ideas on how much? Or, is there a carbuerator I can pick up that would work that would be more adjustable than my original? Any suggestions would be much appreciated. My wife is already planning a hayride party for the neighborhood kids this fall... gotta get this thing some more power! HAHA!


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Re: High Altitude Cub... +7,000'

Postby Cubfriend » Thu Oct 04, 2018 9:08 pm

Along with the extra power make sure the brakes are good if your pulling a bunch of kids. Their safety is in your hands.

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Re: High Altitude Cub... +7,000'

Postby Bob McCarty » Thu Oct 04, 2018 9:09 pm

Welcome to the Forum. I think the first thing you need to do is to check the compression and do a full tuneup if that hasn't been done recently (points, plugs, condenser, set valve gap, etc.). I'm in Colorado at 5000' and don't have problems if the Cub is in good shape. Decking the head won't help if the compression is already low. Can you read the part # on the flat area of the carb above the float?
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Re: High Altitude Cub... +7,000'

Postby staninlowerAL » Fri Oct 05, 2018 7:17 am

Good advise on the full tuneup. Just remember you only have about 10 hp maximum so don't expect a miracle.

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Re: High Altitude Cub... +7,000'

Postby inairam » Fri Oct 05, 2018 8:34 am

Cubfriend wrote:Along with the extra power make sure the brakes are good if your pulling a bunch of kids. Their safety is in your hands.

:Dito: :Dito: :Dito:

I had a white knuckle experience with kids in a wagon. Small wagon not a lot of kids as level as ground as you have. This is not a big tractor. A wagon that is too big will push the tractor.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Re: High Altitude Cub... +7,000'

Postby jsfarmall » Sat Oct 06, 2018 10:33 am

Fresh rings would be good to be sure of. Compression test will confirm that. A high altitude head was available but not sure of particulars but I know they were higher compression. Decking the head a little should help if engine internationals are good and good ingition system. Points, plugs, etc. There was also a high altitude carb. I don't know much about it other than I know the jet was bigger. .035 where I think the standard jet size is .030.

Pulling a wagon with a load, brakes are non negotiable. Cub brakes are not known for being good so be careful on hills. If flat ground you should be just fine. Not much is more enjoyable than a wagon load of laughing smiling kids, not much more scary than a wagon.load of scared kids with the tractor out of control. Just be careful with that.
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Re: High Altitude Cub... +7,000'

Postby IHCFan1950 » Sat Oct 06, 2018 11:46 am

Welcome to the forum! I agree with what others have already stated, and that a full tune up is definitely in order. Be careful with those kids, and remember, Cubs don't have high performance brakes on them, (they don't have much brakes period). Enjoy your new Cub and have fun!
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