Today I went for a ride with my buddy. Shifting was solid, 1st, 2nd, 3rd, and 4th seemed OK. Pulled hard. However, it seemed that 5th and 6th reved normal but did not accelerate correctly. On the way home, after I left my friend so it was just my bike I could hear, I was in 5th and grabbed a wrist full of throttle. Rev'd to 8k but only hit 83mph. I don't know guys, it just seems wrong. Anyone have anything similar?
2004, 3k miles, Mobil 1 I think, is there an additive that would be good? I will do a change and see if that helps. Oh, one more symptom. While in neutral, with the clutch pulled its smooth, but if I release the clutch I can feel a vibration. But I have felt that since I first time I got the bike started.
Mobil 1, if it's car oil - will make your clutch slip and isn't formulated to work with a gearbox & wet clutch. Doesn't do the engine any harm (My VFR750 ran on Mobil 1 for 10's of thousands of miles, but I needed to put in beefier clutch springs because the clutch slipped).
I don't know if it'll stop slipping if you put in a decent performance bike oil now (probably would, eventually is my guess), if not - either new clutch discs, or stronger springs.... standard clutch on an RC51 is pretty heavy as standard though...
Euro RC51 SP2: HRC WSB Ti Hi-Level, T1 Airbox & Snorkel, PCIII, Dymag CA5 Carbon Wheels, Ti64 Spindles (F, R & Swing Arm), Mori Link, Maxton GP7 Shock & Ohlins 832 Forks, Brembo GP Calipers & SBK narrow track (F), Braketech Disc (R), Brembo billet Underslung x 2 Brembo RCS, Tyga Triple, 7075 Stem, Probolt Titanium all over, Babyface rearsets, MR Complete Carbon Lineup, Custom Undertail & CBR 1000 LED, Watsen LED Indicators, Harris Brace, Giles clip-ons, Corbin seat, etc. 2013 BOTY.
On the surface, it sounds like your plates are worn, or your clutch springs are sacked out.
I'd suggest inspecting and measuring the clutch plate thickness and replacing if below spec or glazed.
Also check length of each clutch spring.
If any of the clutch springs is below spec, it won't apply sufficient engagement pressure, or unequal pressure.
Most likely, it's just the friction plates worn, and possibly glazed as well.
Be sure and note the three types of plates used on an SP2 clutch that uses the judder spring and seat.
The special inner plate, the middle plates, and the special outer plate (that sits in the shallow groove).
Mobil1 motorcycle oil is well known to cause clutch slippage in motorcycles lots of stories over the years from BMW Adventure riders etc, but of all the motorcycles I have owned the only one that had a premature clutch slip problem was my Erion built 900RR when I put in Mobil1 Racing 4T. I don't know if it has Molybdenum in it which is well known to not work properly with many different versions of Honda organic clutch disks or if the stuff is just too slick to do the job, but there is definitely a correlation between honda clutches slipping and Mobil1 oil.