trans issues? - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 19 (permalink) Old 06-28-2015, 08:29 PM Thread Starter
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trans issues?

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?
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post #2 of 19 (permalink) Old 06-28-2015, 08:36 PM
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Sounds like your clutch is slipping based on the symptoms you are experiencing (lack of acceleration while in high gear). How old is the engine oil and what type of oil are you using btw ?

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post #3 of 19 (permalink) Old 06-28-2015, 08:50 PM Thread Starter
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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.

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post #4 of 19 (permalink) Old 06-28-2015, 09:07 PM
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Moved to Tech Talk...
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post #5 of 19 (permalink) Old 06-28-2015, 09:49 PM
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Just to clarify, was that automotive grade Mobil 1 or is it the motorcycle specific Mobil 1 oil that you are using?

Skip using any additives.

I take it you have a 2004 model year bike with 3000 miles on the odometer, yes?

What I was trying to get at is when was the engine oil last changed and how many miles have you ran on said oil (?).

Reason being, if it is fairly "old," it's possible to get some funky shifting/clutch behavior, especially if the oil that was in there was not very friendly with the wet clutch system of bikes.

Starting with a fresh oil change and getting a "baseline" for the shifting behavior will hopefully reveal more about your clutch/shifting behavior; report back and let us know how it goes.
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post #6 of 19 (permalink) Old 06-28-2015, 09:52 PM
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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...

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post #7 of 19 (permalink) Old 06-29-2015, 07:29 AM Thread Starter
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It was motorcycle Mobil 1. And it has been in there for about 2 months and 200 miles. I'll check the manual for required viscosity and drain/refill and see if that helps.
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post #8 of 19 (permalink) Old 06-29-2015, 10:23 AM
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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).
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post #9 of 19 (permalink) Old 06-29-2015, 11:21 AM Thread Starter
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Hey Sub,
Is that process described in the service manual? Are there any special tools required? I have never messed with a bikes clutch, I always let the pros do that.
Thanks

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post #10 of 19 (permalink) Old 06-29-2015, 11:21 AM
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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.
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