Join Date: Apr 2008
Location: SF Bay Area / NorCal
Clutch modification Nirvana (or half shimmed heaven) leads to better MPG!
Wow, just installed my modified 04 clutch basket and I seem to have reaped some unexpected benefits from my shimmed clutch mod! I got a 5MPG bump (45MPG on my first measured fill up)!!!
Anyone else see this with modified/improved basket?
I was pleasantly surprised but it's really just icing on the cake. Actually, I would have been willing to sacrifice 5MPG, the real joy is how good it is to have a clutch that works like a dream and eliminates all of the standard gripes chudder/grabby clutch (AKA-clutch slap?)/idle hammer as well as vibrations and noises all over the rev range that you never realized we're emanating from that sloppy little basket down there. What an amazing difference!
I did use a slightly different approach than just a straight shim between the spring and the drive gear. Instead I used half shims to remove all slack between the top plate, drive gear, bottom plate and basket and then welded them in. This is a relatively easy process, dirt cheap and the result is simply magical.
Honestly, I have admired the beautifully reworked baskets from Realshelby (Werks modified clutch baskets) for quite a while and would love to have one eventually but my budget just hasn't allowed it. So, as my second basket (an SV1000 version with the heavier springs that I installed at around 40K miles (76K on the clock now)) slowly spiraled into full blown chudder again, I decided I had to do something. The shim fix seemed to be the best answer but as I started working on it I noticed it didn't eliminate all the slop between gear and basket and removed some of the functional working range of motion of the springs so I reconsidered the problem and came up with a slightly different strategy- half shim! Preload between top plate and springs creates a direct sprung connection between all components top plate/drive gear/bottom plate/basket.
Not sure what to call it, half-shimmed, half-baked, half-assed if you like but it seems to really do the trick. It turned a worn out, chuddering old 04 basket into a downright great clutch that I can live with for quite a while and has kept me grinning like a madman since I put it in.
Suzuki DL1000 k4 (Midnight Blue). PCIII, Ivans, Staintune, Wilbers rear, Racetech springs, Pilot road 3's, SW Centerstand, SW crash bars, Zumo w/XM ant., Corbin seat, simtek heated grips, grip puppies & throttle rocker, Madstad & Ceebaily, reworked electrical- Ricky stator/2015 Vee series R/R (874A 50-amp), Battery Tender lithium battery, half-shim improved 04 clutch basket
Honda 86 TLR200 trials bike W/BB kit
Honda 76 TL250 trials
Last edited by babalaufer; 10-25-2015 at 09:39 PM.
Reason: Mistaken identity