750R wrote:Thanx foor the information - i'll try to contact them! will get funny wth my really bad English
W'll let you know what the answer was.
The spring for the 1100 can be a bit harder - 50kg more weight in the motorcycle (an don't ask for the driver )
Greetings
The sonic spring calculator would have me (at 95Kg in gear) running a 1.00 Kg/mm front spring on an 1100. I'd certainly be reluctant to go any heavier than that, at least initially.
P.S. after a very long test ride I'd decided to increase the front rebound speed a little by increasing the single rebound hole in each damper rod by one drill size. Currently its 3/32 inch I think. One size larger would have me back pretty close to the original size (but one of the two original holes totally blocked). If the rebound proves to be too fast I can easily slow it back down by going up to 5W oil (or some appropriate mix).
Finally got this project finished (well 99% as I'm sure I'll go on tinkering trying to squeeze a factor more out of the bike).
VERY please with the results. Final set up is ....
5W fork oil
One rebound hole in each damper rod
Cartridge emulator 1 slow speed compression bleed hole.
2 turns blue spring high speed compression damping.
Lots and lots of experimentation to arrive at the above. The main problem wasn't really with the settings I was trialing, the problem I was actually trying to sort wasn't even in the front suspension at all, it was in the rear suspension. It was inadequate compression damping that was making the rear give a harsh ride. Harsh ride, natural to reduce compression damping you'd think. No, needed to be screwed way up.
Front fork upgrade now complete. WAY better than original, or previous effort.
Final configuration for anyone interested.
Springs - Linear, spring rate 0.90 Kg/mm for a 95Kg in gear rider
Fork oil - 5W Motorex (note fork oil weight varies across brands, there is no standard)
Fork Oil Height - 140mm
Race Tech cartridge Emulators set to: 1 bleed hole at 2.76mm, Blue springs set 2 turns
Rebound damping - One hole in damper rod, 2.76 mm
Front fork brace
Note: the 2.76mm is actually a 7/64" drill (think I remember than one correctly).
Total cost of the project if starting from scratch would be in the vicinity of US$400. I don't think it a stretch to say the final result is pretty much on a par in performance to stock modern forks.
P.S. I considered the stock damper rod forks not only very poor in performance, they were actually dangerous. So to me, doing nothing was never an option. It was just a matter of what modification represented the best 'bang for buck' and was viable from an engineering perspective.