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Old 02-04-2008, 03:51 AM   #1
johno OP
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Location: Mount Gambier, South Australia, Australia.
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Big Bore kit Rotax 650??

Does anyone know of a big bore kit for the Rotax 650(BMW F650GS)??
I like my F650GS, but wouldnt mind a bit more grunt.
I have thought about changing bikes, but like the size of what I have, and it is nimble around town as well. Had an R1150GS years ago, and while a great bike, was a bit heavy.
Not too keen on waiting for the F800GS( if it ever turns up)
Own what I have, farkles golore, so dont want to start again.
Any ideas??
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Old 02-04-2008, 04:50 AM   #2
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Not sure if this will help you if you have an EFI equipped F650 but it might be worth a look.
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Old 09-25-2008, 10:46 AM   #3
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more grunt

Hi the early pegaso with oversized mikuni carbs with race cans fitted will achieve 50 bhp + hope this helps
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Old 02-28-2009, 08:30 PM   #4
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rotax650 parts in oz?

Hi Johno - I need to rebuild the gear box on my 2001. Any clues for parts in aust.
squirts - Perth
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Old 02-28-2009, 10:16 PM   #5
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Old 03-01-2009, 06:07 AM   #6
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That engine is used for supermono racing in europe and tuning parts are avaliable untill absurdum only your wallet will set the limit....

Bigbore/stroker to 790cc, billet heads with dual FCR37 and pistons with ulta high compression will give you some 500km between rebuilds
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Old 04-17-2010, 08:12 PM   #7
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Dunno if you still looking coz the original post is 2 years old
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Old 04-18-2010, 12:16 AM   #8
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Location: Dreary old Norway, dreaming of adventures past
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Originally Posted by Roughseas

Dunno if you still looking coz the original post is 2 years old
Thats just cruel !
90 bhp would be nice, but the pricetag isn't.

I've asked this before and no one replied, but has anyone ever concidered or actually put a Rotax snowmobile engine (800 ccm) in a 650 frame ?
'01 F650 Dakar - modified as best I can

2005: Australia - 8 months/ 26.000 km (anti clockwise circle)
2009: Norway - 2 weeks/ 6000 km (Lindesnes to North cape)


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It's the African ant eater ritual !
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Old 12-21-2012, 04:16 PM   #9
be happy :)
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Yes, I am bumping a 2 year old thread....
however, did anyone actually take acloser look at Team PAMI's website?

They offer 103,5 mm cylinders (you have to send them yours) and pistons.

So you'd get: (103.5*/4) *83 = 698.31 cc

That (plus a lot more modifications, a few available on PAMI's website, too) is what the 5 TT Rallye's ran in the 2002 Dakar, by the way:

Motor: Water-cooled One Cylinder 4 Stroke engine, 103.5*83 mm bore/stroke -- 698cc, Injection, 51 Kw/70 hp at 6900 rpm, Stainless Steel Manifold and Titanium Exhaust, custom Carbon airbox with 4 air intakes, custom dry sump 3 liters (nearly a gallon!) oil tank, 2 water coolers plus oil cooler, 280mm suspension travel in front and rear, Seat Height 970 mm, Wheelbase 1545 mm, weight without gas: 175 kg, etc.

Just sayin'
"a scoot (that wouldn't go more than 28mph if you dropped it out of an airplane)" ~duck
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TobyG screwed with this post 12-21-2012 at 04:27 PM
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