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Old 04-08-2011, 09:11 PM   #1 (permalink)
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335cc Rotax Sled Engine

Hey guys im really new to the whole snowmobile stuff, but i found this engine on craigslist and wanted to know if it was worth it.

2-Cycle motor 335cc single cylinder. ROTAX!
this is the link to the add.

its missing the carb and the exhaust so i was thinking of making it a new exhaust and trying to fit an old briggs and stratton or honda carb on it.

edit: the 13hp briggs engines are rated at over 370cc. could one of these carburetors work??

Thanks
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Old 04-09-2011, 06:02 AM   #2 (permalink)
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What are you trying to do with it? The exhaust NEEDS to be tuned to the engine so it doesn't burn a piston down (2 strokes need backpressure provided by the exhaust). As far as the briggs carb, not sure on that!
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Old 04-09-2011, 11:05 AM   #3 (permalink)
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i wanted to put it onto a gokart so i thhought i would be able to throw any old exhaust on there, and a carb.

how much is the exhaust for this engine??
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Old 04-09-2011, 11:26 AM   #4 (permalink)
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You need to find a junk complete sled that you can take the whole engine with carbs and everything to make it run, plus then you can steal the chaincase off it and mount that right on your go kart to make it drive! Be suer to get both clutches!
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Old 04-10-2011, 06:05 AM   #5 (permalink)
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Where are you located? I've got a running Rotax 277 with exhaust, oil injection tank, etc, for $250.
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Old 04-10-2011, 07:15 AM   #6 (permalink)
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Another problem with using a carb from something else on that engine is that the pulse line actually runs through the manifold rather than as an external line, so you would need a carb specific for that engine.
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Old 04-13-2011, 10:34 AM   #7 (permalink)
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The 335 was used by Ski Doo in the Olympiques from '70 through '72 and are bullet proof, run for ever engines. Used mufflers are hard to find but you can get a new one at: Vintage Snowmobiles | Vintage Snowmobile Parts | Snowmobile

The card is a Tillotson HR17C.

The 335e, electric start has an external coil as opposed to the internal coil of the non e model. In my opinion the external coil is more reliable.

The motor is designed for snowmobile use so running in a cart be sure to allow ample air flow to keep it cool.
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Old 04-15-2011, 06:12 PM   #8 (permalink)
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what does the lack of backpressure from the exhaust do to the engine??

edit: would an exhaust like this one work?? YAMAHA TRI Z EXHAUST PIPE AND SILENCER EXPANSION | eBay
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Old 04-15-2011, 08:25 PM   #9 (permalink)
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If there is no back pressure, it causes the exhaust side of the piston to get hot enough to melt and score up the piston/cylinder. That exhaust may work, but it's tuned to a 250. The best bet is one from a 335.
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Old 04-16-2011, 01:13 PM   #10 (permalink)
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i found this carb on ebay. Its a mikuni brand snowmobile carb.

MIKUNI VM-30 Carburetor- Snomobile + Motorcycle + Cart | eBay

will that work on the rotax??
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Old 04-16-2011, 01:33 PM   #11 (permalink)
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It would work, but you will have to drill a hole into the base for a hose barb so you can add an external fuel pump too.
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Old 04-16-2011, 04:34 PM   #12 (permalink)
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im sorry but everything you said after it woulld work was japanese to me. LOL
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Old 04-16-2011, 04:37 PM   #13 (permalink)
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ok im starting to make sense of it, but what type of fuel pump would i need??
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Old 04-17-2011, 06:51 AM   #14 (permalink)
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A Mikuni square pump would work after you put the fitting into the engine base.
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Old 04-17-2011, 07:06 AM   #15 (permalink)
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wat does the pump do exactly and is it necessary??
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Old 04-17-2011, 07:13 AM   #16 (permalink)
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Yes, it will be necessary.
The original carb has the pump as part of the carb. A mikuni used a separate pump to fill the bowl.

If you take a look at the manifold on the engine, you will see a small hole just inside the right carb mount stud. This is the pulse line that runs the fuel pump. You will have to make an attachment place (hose barb in the base) for a pulse line for an external pump.
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Old 04-17-2011, 08:19 AM   #17 (permalink)
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how difficult is it to do this??

would one of you be so kind as to find me a square pump thatll work on ebay for cheap i dont know what im looking for so maybe one of you could help
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Old 04-17-2011, 10:36 AM   #18 (permalink)
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Mikuni Single Fuel Pump - DennisKirk.com
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1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


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Old 04-17-2011, 04:12 PM   #19 (permalink)
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also found this on craigslist. im thinking i should just go with this that way it has everything that i need right there.

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Old 04-18-2011, 06:57 AM   #20 (permalink)
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I'd be concerned about there being no plugs in the heads and the top shroud missing.
With the plugs out, a lot of moisture can get into the engine and cause bearing damage.
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'90 Wildcat Project in progress.

Vintage (sorta)
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1980 AC Pantera (donor engine to the 90 wildcat)


http://www.dcdrifters.net/


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