This fault first occurred last November. Performing an overtake the bike felt like it had hit the limiter, but with only 6000rpm on the clock. A tad disconcerting to say the least. My first thought was a blocked tank breather, but popping the filler cap didn't solve the problem. I searched through the forum posts and only came across one with very similar/same symptoms. Sadly that bike didn't get fixed over a 6 month period, and the owner gave up on Fazer ownership. I did the relevant TPS checks which proved ok. Although the Pipercross air filter was only 2 years old I replaced it with a new one, a spare is always handy. On riding the bike, the fault was gone.
Wind the clock forward to last Sunday on a breakfast run, full tank of my usual 97 octane, about 30 miles into the ride the bikes pulling like a train. Accelerating out of a roundabout onto a dual carriageway.......the faults back, 6000rpm the involuntary limiter is hit, change up runs fine to 6k then same again. Pull into first layby, pop the tank cap, no rush of air. The fault persists all the way home, even after an hours stop. Change the fuel filter and check that nothings been sucked into the air filter. A quick whizz up the road, bike runs ok, Today did just over 150 miles of mixed riding, with plenty at high revs, bike ran perfectly. I'm not convinced the fuel filter was the culprit as cutting the old one in half revealed nothing untoward.
When the fault manifests itself it happens bang on 6000rpm in any gear, but revs as it should with the clutch in or in neutral. I was told the ability to rev freely in neutral proves the TPS is ok, but don't know if this is true. Obviously no rev counter fault codes are displayed. Naturally a degree of lack of confidence in overtake situations now exists. The one thing that I will try if/when there's a next time, is to not touch the bike, just ride it the following day to see if the fault persists which might prove if it's possibly heat related. Thinking caps on people, answers on a postcard to...... .Thanks in anticipation of some suggestions.