Main Motorcycle: '08 Moto Guzzi 1200 Sport
Join Date: May 2005
Location: Hudson, Ohio - USA
Other Motorcycle: 2012 Griso - SOLD
Extra Motorcycle: 1991 BMW R100GS
|Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.
Sponsored by: Triumph Twin Power Ltd
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Hi Bob, you need to measure the depth of the Thruxton fork cap and washer and the Bonnie fork cap. This will give you the difference between the two, and you remove this figure from your spacer to make the preload the same as it was without the Thruxton caps. I would also remove an extra 5mm from the spacer and wind in the adjusters that amount to give you +13mm/-5mm adjustment from your standard preload.
Then of course you have to remove the Intiminator measurement which is quoted as 0.56" or about 14mm from your spacer tube.
I'm also going down the exact same road. In about 1/2 an hour I will be stripping the forks down, fitting low stiction seals, Intiminators and the Thruxton fork caps, I will be following the above procedure.
EDIT: I see Ventura has come in with the Thruxton fork caps being 17mm deep and going +12mm/-5mm, he may well be correct. What ever the measurment I'll have a -5mm just in case.
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