Coffee Sport Rough Running

[galaxiid]

My 2003 Cafe Sport is a great bike....but sometimes it drives me nuts with glitches that are usually easily fixable (such as relays). When it goes well it doesn't just hum, it sings. Well at the moment it is singing when you give it gas, but on a light throttle it is missing & phutting (not so much popping and not backfiring). If anyone can help diagnose this please do, your 5c worth will be appreciated....

 

The bike has mistrals, PCIII and have just fitted a BMC air filter with the lid cut off. The TPS settings were checked and it was dynoed. This was supposed to be to allow for the new airfilter.

 

Since I have had it back it phuts/misses at light throttle settings to the point where it doesn't run smooth at all after backing off the throttle into and out of corners, or just riding along at say 50kmh on a light throttle. But give it gas and revs and it does fly, no problems there. It also idles just fine as well.

 

I tried to adjust the low range settings manually on the PCIII and the box didn't show any response. This is after holding down the three buttons, starting the bike and then tapping the low range button. Nothing changed. i don't have a P.Comp to connect it to either.

 

I have checked the inlet boots because that has been a problem when they have cracked in the past. They appear snug and airtight.

 

Could this be a PowerCommander fault? I've been told they do die. Any other possible causes? Presumably electrical or fuel....

 

It is at the point where the bike is extremely frustrating to ride.....bah

 

picture attached of whats under my seat, if that gives anyone ideas...

[mznyc]

Have you disconnected the PC3 and run her?The rule of thumb is the bike should run well before you add a PC3.If it runs well the PC is probably at fault.

[galaxiid]

Thanks for the above. think I'm making progress with the fuelling. Got to grips with the PCIII which is working now. Makes a difference checking all three buttons are held down with left fingers, pushing left knee into clutch, turning ignition key and pressing starter with right thumb. Being a contortionist made a difference, will post something more positive for a change in the near future. Not sure if I'm all there yet but It's not all doom & gloom!