well fitted it today (Thanks again to Pete for turning the pulley)
well impressed , now i just need the front pulley

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Feros Ferio

the standard Buell gearing on my X1 was
55-29 UK gearing ( 55 tooth pulley part no.40244-91)
the US option is
61-27 US gearing ( 61tooth pulley part no.40246-91) cheers Dave

the US Buell ratio pulleys are a bit hard to find & can be expensive.


Sportster rear pulley (part no.40246-91) has 61 teeth
this will fit BUT you need to enlarge the central big hole by about 3mm Dia.
cheers Pete

i only changed the rear pulley on mine which gives 1/2 US gearing , but a marked improvement in bottom end response

be aware though this alters your speedo , it will be around 10% optimistic

for full US gearing front & rear pulley , you are going to need a US spec speedo
or a speedo altering device.

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Feros Ferio

            USA      mix      EC
sprocket    27       29       29
pulley      61       61       55
ratio      3,615   3,366    3,034
rpm        km/h    km/h     km/h
2000       66,31    71,22    78,99
2500       82,88    89,02    98,74
3000       99,46   106,83   118,48
3500      116,04   124,63   138,23
4000      132,62   142,44   157,98
4500      149,19   160,24   177,73
5000      165,77   178,05   197,47
5500      182,35   195,85   217,22
6000      198,92   213,66   236,97

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"It is often said that before you die your life passes before your eyes. It is in fact true. It's called living."
Terry Pratchett

Gunter , have you a MPH version ?

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Feros Ferio

Just multiply by .621

USA mix EC
sprocket 27 29 29
pulley 61 61 55
ratio 3,615 3,366 3,034
rpm mph mph mph
2000 41.18 44.22 49.05
2500 51.46 55.28 61.32
3000 61.76 66.34 73.58
3500 72.06 77.40 85.84
4000 82.36 88.46 98.11
4500 92.65 99.52 110.37
5000 102.94 110.57 122.63
5500 113.24 121.62 134.89
6000 123.53 132.68 147.16

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In a purple fug

I'm sure I saw a plug in speedo corrector on the Dutch 'Twins' Buell site. Interested in doing this gearing swap on the M2 myself, so was looking at options to correct any mph error I would get afterwards. I'll try and drag out the listing and re-post later.

Here is the one listed for Buells on the Twin Motorcycles website

http://www.twinmotorcycles.nl/webshop/a ... Corrector_

Would the stock 126 tooth belt be long enough to cope with 61 tooth rear pully? Having to swap belt will make an otherwise cheap mod a bit expensive. Busy shopping for a 61 tooth Harley pully now. After riding the M2 this weekend on the stock 29/55 ratio I'm already finding it too leggy, and the 1/2 US spec gearing looks like a good option.

Stock belt is 128T and yes it works fine with half 'n' half gearing.

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Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

Nice one! This is the cheapest one I have ever seen! Off to practice my Dutch

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Illegitimi non carborundum

Thanks maz - thought I saw 126 teeth quoted for M2 somewhere ont' internet

Just done the same - the M2 feels a lot better on 1/2 US ratio

61 tooth Buell pully for sale on ebay

http://cgi.ebay.com/ebaymotors/ws/eBayI ... 0591648021

I recently swapped to US gearing but the speedo healer I fitted isn't correcting enough. Considering fitting a secondhand US speedo. Would one from a 1999 spec injected X1 work on my 2002 carbed M2? Don't want to drop cash on one only to find it's a non starter.

http://www.ebay.co.uk/itm/Buell-electri ... 4163d53654

- GT - the Corrector from Twin claims a 50% adjustment and the ratio difference between full UK and full US Gearing is just under 20% - so I was thinking of buying this model - can I ask why is yours not working ? -