Stopped riding over the very rainy period, but been back on it every day this week. I commute about 25 miles each way on a mix of A roads and motorways. All week the bike has felt a little hesitant to get going when I open the throttle, and won't rev much above 7000, as if the rev-limiter is cutting in too early. If it had four cylinders I'd say it was only running on three. But I think it'd be really lumpy on only one. Any ideas?
That's what I thought initially, but no warnings. Funny enough though, I've just got it back from Snells after they dealt with the EXVL problem for the third or fourth time. Will check for sure at the weekend.
Check for water ingress into the sparkplug recesses in the heads. Blast out with an air hose (if you have one) and spray the coil sticks with water dispersant.
Yes can be...It could be partially working (sticking) not always enough to cause a fault and bring the EVXL warning light on, but still enough to give you poor running. I would check it by removing the cable at the exhaust valve end, and making sure the valve itself moves freely under its own spring action
I'd check if the cable is connected correctly, especially if it has been worked on recently. If it wasn't seated quite right and came loose you probably wouldn't get an error would you, since the test just checks for movement and a level of resistance?
So, turned out to be the exhaust valve was stuck in the closed position, and the cable was still moving freely, though not doing anything, hence the lack of EXVL alert. I've taken apart what I can and applied WD40 and corrosion block grease, and all appears to be OK again. Frankly, I'm fed up that such a minor component should require so much attention. What would happen if I simply disconnected it? If I understand correctly, there's no performance/running issues in doing this, as long as the valve remains open. Could I just leave the cable end to flap freely, or is it not as simple as that?
I took a dremel to the securing screws (they're spot welded) of the butterfly itself and threw it in the bin! Mechanism still operates as normal just without the valve.
rivets I would like to do this but don't quite understand what you did. How do you get the butterfly valve out of the exhaust and not leave a hole? I have a dremel and various attachments - could you explain the procedure in more detail please. Any photos or diagrams that might help?
DenH. Take the end section off and look down the exhaust, you will see this. Zap the screw heads, I had to cut them off, take out the valve, remove the remaining threaded portion of the screw, put it back together. Voila
GarySN. You're right, spindle still operates as normal, no warnings much better low speed running but you do still need to "look after" the mechanism.
rivets, that's brilliant. I hadn't realised that you removed it from the pipe! Now all is clear and I can have a go. Many thanks.
