needing information on a polaris engine - HCS Snowmobile Forums

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Old 02-21-2012, 11:35 PM   #1 (permalink)
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Default needing information on a polaris engine

Newbie here I bought a Polaris engine and wanting some more information on it
It is a Polaris 432 cc twin cylinder
it has the model number EC4PM-01
i bought it cheap and i stripping it down to check everything it came with 2 carbs that i want to replace as they are damaged
any suggestions on what carbs to get the best perfomance out of the engine ( i am planning on putting it in a Buggy Project )
Many thanks
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Old 02-22-2012, 12:39 AM   #2 (permalink)
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Fan cooled?
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Old 02-22-2012, 01:00 AM   #3 (permalink)
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honestly i have no idea i bought it as a bare engine i am new to snowmobiles and found it cheap i thought i could use it i am needing to know is it 2 stroke or 4 stroke and what Carbs to replace the old ones with that info will be enogh if anyone can help i have the model and number off the engine if that is any help
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Old 02-22-2012, 01:28 AM   #4 (permalink)
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From what I can find it's a fan cooled 2 cylinder 2 stroke.

Can you double check the engine number? I think you might be missing a digit in there.

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"Caution should be exercised in operating any snowmobile. However, due to the unusual high performance of this snowmobile, extra caution must be exercised during operation." -1985 Indy 400
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Old 02-22-2012, 01:34 AM   #5 (permalink)
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oops sorry my computer dosent like how i type i am used to a more sensitive keyboard its model number is EC44PM-01 ( i missed the 2nd 4 )

guy i bought it of says its a 4 stroke

Last edited by wildwilky; 02-22-2012 at 02:03 AM.
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Old 02-22-2012, 08:44 AM   #6 (permalink)
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It's a 2 stroke. Measure the carbs that came with it. Probably 34 mm mikunis. Used on countless models and brands over the years. Easy to find. Just swap in jets and parts from old ones or get same replacements as necessary.
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Old 02-22-2012, 10:17 PM   #7 (permalink)
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Current Sled(s): 2012 Polaris 600 S/B Pro-R, 2009 600 S/B
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432 cc, fan cooled
Years 1978-1980
6500 rpm
VM34SS carbs, w/200 mains, 35 pilot jets
6DP1-3 jet needle
P-6(166) needle jet
2.5 throttle valve
1.5 valve seat

Last edited by mal; 02-22-2012 at 10:24 PM.
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Old 02-23-2012, 08:27 PM   #8 (permalink)
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Thank you for the info, i dont have a problem but i was hoping for a 4 stroke for the project i bought the engine for i think i will use t for another project
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Old 02-24-2012, 11:51 AM   #9 (permalink)
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4 stroke for snowmobile motors is a fairly new innovation. You're not going to find an "old cheap 4 stroke" sled motor. You might want to start looking at old motorcycle engines, much more common.
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