Stumbling SP-2 ... sometimes ... - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 3 (permalink) Old 06-13-2012, 05:35 AM Thread Starter
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Stumbling SP-2 ... sometimes ...

So, I have worked slowly through all the small issues the bike still had, and, besides of the re-paint, everything is fixed.

However, I remain to have one problem which I am not sure on:

If I ride on the road, and the bikes is warm to hot, if I ride it for a while in the middle rpm's, and I suddenly accelerate, the bike stumbles.
Like it does not get enough fuel, a bit like overheated carburetors and a vacuum lock on classical bikes.
If I run through the RPM range once or twice, it is over.

And the strange thing is, I had the same problem on the way and back to a track day, but not during the three sessions.
The bike is pretty standard, with a fresh air filter and fresh plugs (changing the plugs did not solve the problem), and does not have a PC.
The fuel lines are free, not squeezed.
I wonder if this is fuel-pressure related, or caused by other things?

Any suggestion is welcome.

Eric

Last edited by ericjansen; 06-13-2012 at 05:38 AM.
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post #2 of 3 (permalink) Old 06-18-2012, 03:57 PM
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Sounds like you already ruled out some of the possible culprits.

How is the quality of fuel over there in China btw? Are you filling up at the same gas station? Do you think it's possible you got a bad batch of fuel?

I would examine the fuel pressure regulator (FPR). Prop your fuel tank up, remove the small vacuum hose from the FPR and check for fuel dripping out (no fuel = good).

If the FPR checks out, I'd probably drop the fuel pump out of the tank and replace the fuel filter. How many miles on the bike btw?

G'luck troubleshooting...

'06 Black/Metallic Gray RC51
-Competition Werkes FE w/
Clear Alternatives IT

'02 Silver/Black CBR 954RR
'11 Graphite Black CBR 1000RR (sold '15)
'08 Pearl Orange CBR 600RR (sold '11)
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post #3 of 3 (permalink) Old 06-18-2012, 07:01 PM Thread Starter
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Quote:
Originally Posted by COBRA90GT View Post
Sounds like you already ruled out some of the possible culprits.

How is the quality of fuel over there in China btw? Are you filling up at the same gas station? Do you think it's possible you got a bad batch of fuel?

I would examine the fuel pressure regulator (FPR). Prop your fuel tank up, remove the small vacuum hose from the FPR and check for fuel dripping out (no fuel = good).

If the FPR checks out, I'd probably drop the fuel pump out of the tank and replace the fuel filter. How many miles on the bike btw?

G'luck troubleshooting...
Thanks for the reply. Yes, we have very crappy fuel here, but not this time. I filled up at the track, did the last session without a problem, then rode home with the problems occuring as on my way to the track.

What puzzles me a bit is that it occures under "cruising" conditions. If i go through the rpm range once or twice (or track use for that purpose), it does not occure.

Did not have time to go any furhter, but will check/replace both as you said, the vacuum hose and the filter.

The filter might well be it, no idea on the real milage of this bike, certainly not what the ODO indicates. But that is normal here in China...

Eric
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