If you really want to upgrade the throttle response of your Silver Wing 400/600, Dr.Pulley's sliding roller SR2820 & unique clutch HiT251706 might be interesting.
You can get some information from the performance of HiT251706 in the Sliver Wing 600 in the
website of http://www2.bigscooter.com.tw/forum/viewtopic.php?f=56&t=8142--- Dr.Pulley For SW600 高咬合後離合器測試感想
Test result of HiT251706 in Honda Silver Wing 600 (2001 model):
1) open the throttle slightly you feel the initial clutch
-in proceeding at 2150 rpm ( idle rpm is 1250 ) .When the throttle is fully open you can feel the clutch
is smoothly & powerfully engaged fully at 2700 rpm and the speed
goes to about 60km/h without any noise or vibration. The speedup from 0
to 40 km/h is obviously 50% faster than the original setup. For those
who prefer a very gentle take-off, you might need a bit time to get
used to the "slightly wheelie" feeling on your SW600.
2) the speedup from 40 to 80 km/h ( ca. 3700 rpm ) is also powerfully accelerated, and there is no any noticeable clutch
slippage as that in the stock clutch
You can feel its throttle response is very excellent, especially in
roundabout, slightly hilly area or overtaking on the road.
80 to 120 km/h, its acceleration curve is different than the stock
one. 80-100km/h, it is a little bit softer than original setup but is
more smooth (For stock clutch
, the acceleration is pretty violent as soon as the speed reaches 90km/h (ie.4000rpm), where the stock clutch
finally stops slipping and--- You can feel another acceleration of HiT clutch
again at 110km/h ( 5000rpm) and the engine rev at speed of 120km/h is 5500 rpm.
from 120 to 180 km/h, its speedup acceleration is as powerful as that
at 110 km/h, all the way continuously from 120 to 160 km/h
(7450rpm),from 160 to 180km/h is same as the original clutch
it takes about 7 sec from 0 to 100km/h (with HiT & stock roller
35gram ,for reference only). I'll expect a further improvement if
going with Dr.Pulley sliders...
Original test result in Chinese---
You also can get some information about HiT clutch
from following websites