Weird problems today - help! - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 8 (permalink) Old 06-20-2011, 10:57 PM Thread Starter
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Weird problems today - help!

Hey All,

I was out for an easy ride today and had a few mechanical hiccups..

While cruising at approx 50 mph, I could detect a very faint surging sensation. Almost as if my chain was about to seize. Then a few moments after that - a fairly large drop in power which came back immediately. (felt like a fuel pump failure or some sort of electrical hiccup to me at the time)

I cautiously evaluated and rode for 5 - 10 min and everything seemed normal.

Then while passing a transport truck, and under fairly hard acceleration in 2nd or 3rd gear - i can't remember at approx 8000 rpm I had what felt like a mechanical failure of some sort. Like the chain slipped on the drive gear or some sort of gearbox slip.

I've been riding lots lately and the only thing I've been noticing is that intermittently while downshifting - the shift lever will stay stuck down for a few seconds.

Any thoughts? The clutch has not been slipping either if that helps

Thanks in Advance
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post #2 of 8 (permalink) Old 06-21-2011, 11:32 PM Thread Starter
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I drained the oil today and saw absolutely no metal when drained through a rag.

No ideas at all?
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post #3 of 8 (permalink) Old 06-22-2011, 05:05 PM
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Clutch master and slave cylinder fluid check and bleed. May have bad piston/diaphragm in either end. Master cyclinder piston may become stuck in the gummy cylinder and hangup. Slave cylinder can be very hard to bleed.
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post #4 of 8 (permalink) Old 06-22-2011, 06:45 PM
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During loss of power, did the FI light come on?
If the bike feels like the chain is skipping over the sprocket teeth (but isn't) under power, it sounds like the dogs are possibly worn and sipping out of engagement.
You mention the shifter shaft isn't returning to center position.
The problem could be with shift drum rotation or return spring, or other areas.
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post #5 of 8 (permalink) Old 06-22-2011, 09:47 PM Thread Starter
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Thanks for the suggestions.

The FI light did not come on during power loss.

I'm sure it's possible that these are 2 different problems, but I doubt it. I'm leaning toward the dogs/shifter drum area. (Athough I have no experience in this area at all)

Just wondering how the worn dogs or drum would cause the drag (resistance) while riding at low power-constant speed?

Assuming the sticky shifter was a pre curser to these problems, how does this fit in to the scenario?
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post #6 of 8 (permalink) Old 06-22-2011, 09:54 PM
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Return spring...good call. Although, if you haven't flushed and filled the clutch actuating system in some time, you may want to.

Has the bike ever spent considerable time on a track? The shifter forks may have some wear to them if it has. You haven't had any "false neutrals" lately where you jammed the bike back in gear? I have seen this caused the tips if the shift forks to bust off.

Being the paranoid bastard I am, I would drop the pan on the engine to just take a look see at the transmission. Grenading a transmission is not fun.

Take care.



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post #7 of 8 (permalink) Old 08-04-2011, 06:43 PM Thread Starter
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Hey guys,
I've been commuting on the bike lately and I thought the problem had disappeared (since changing the oil). I surmised that the fuel must have been low and that the bike was just a little sensitive to that.

The problem is back, but now I can say that it seems fuel delivery related. (only during high rpm loading).

I thought I read somewhere that the fuel regulators can be problematic? Is this the kind of problem that may result?

I plan on changing the fuel filter ASAP.

Thx
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post #8 of 8 (permalink) Old 08-04-2011, 06:49 PM
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Quote:
Originally Posted by SubSailor View Post
You mention the shifter shaft isn't returning to center position.
The problem could be with shift drum rotation or return spring, or other areas.
Detent spring is a good call...while the oil pan is down, you can see the shift drum etc for wear/breakage...FPR's are an issue with these bikes over time. This is a shelf item for me because I see i so often here.



The very first schoolbook that was written had God all over it. --Dave Mustaine
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