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Small Air Cooled Gasoline Engines

Bombardier-Rotax 641 Twin


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  #1  
Old 12-29-2018, 04:52:16 PM
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Nevr-Enuf-Stuf Nevr-Enuf-Stuf is offline
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Photo Bombardier-Rotax 641 Twin

Todays find, a "1972" Bombardier-Rotax 641, 635cc, 41hp. Outta be a screamer.

Patrick
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Old 12-29-2018, 05:03:10 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Bombardier-Rotax 641 Twin

Awfull loud with that open exhaust too! you ned to run mufflers on it or you will burn out the pistons real quick!
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Old 12-29-2018, 09:30:08 PM
G.M.Johnson G.M.Johnson is offline
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Default Re: Bombardier-Rotax 641 Twin

Ahh yes, brings back memories of the good ole days and a snowsuit full of gas and fumes! The old timer snowmobilers know what I mean!
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Old 12-29-2018, 11:50:08 PM
Nathan K. Nathan K. is offline
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Default Re: Bombardier-Rotax 641 Twin

Well that brings back memories, many involving a tow rope!. We bought an Alpine twin track that had a 640 Rotax (in pieces) with a broken crank for a project some time back that also came with a 641 Rotax crankcase assy., so with some work it was all fixed up and running great(had no problem spinning both tracks taking off). However It could not make it up and down the mountain without blowing a hole in the no. 2 piston, so after some standard pistons had to hone it oversize and then after more oversize pistons (all that where in Canada at the time!) I was getting very tired of rebuilding it!. Finally We removed the rebuilt original carb., got an adaptor and fitted a modern Mikuni carb+pump and No more problems!. The old carb. would randomly lean-out for no reason and was not noticeable till too late when wide open which with the low gearing is where you spent most of the time!, so after some good runs it was sold to erase the memories . Consider your self warned. Nathan.
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Old 12-30-2018, 12:18:14 PM
Jerry Jerry is offline
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Default Re: Bombardier-Rotax 641 Twin

I have about a dozen Vintage(OLD) Snowmobile Engines if you want more
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Old 12-30-2018, 12:26:40 PM
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Default Re: Bombardier-Rotax 641 Twin

"Jerry"- check your messages. Thanks

Patrick
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Old 12-30-2018, 11:33:03 PM
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ulgydog56 ulgydog56 is offline
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Default Re: Bombardier-Rotax 641 Twin

ya but I love how they get up to rpm quick....
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