Hi
This is a problem that has the local Yammy dealer beat! I have asked for assistance from Yamaha Australia and they merely refered me back to the same dealer. I live in Darwin. The next nearest decent Yamaha workshop is in Adelaide, 2500kms away.
A 1998 Diversion 900. No history of any problems. 70,000km on the clock put on by an older rider that used the bike in a stress free manner with most distances run out in the country. It started using a bit of oil so the dealer recommended new rings. The rings were put in and all seemed in order after reassembly.
Starts and idles beautifully. No noticeable probs when the bike is used around town with gear changes at 3500rpm or under and less than 110km/hr on the highway
But open the throttle just a bit more and here is where the problems started.
The bike will not rev past 5500rpm in top gear. Feels as though it's flooding as backing off slightly will give a little spurt of power.
Under hard acceleration power loss is eveident in any gear with rpm as low as 3000. The fuel consumption seems high but the dealer says it's running very lean on the dyno.
The dealer has tried 3 times to find the problem. 3 separate tries at $88 per hour. Put it on the dyno, stripped the carbies, checked jets, fuel flow, throttle adjustment, timing and a few other things that I cann't remember.
I have a cd of the worksop manual and the only thing I can think of is that when they put it back together they got the cam chain wrong and then fiddled with the timing to cover the mistake
If anyone can diagnose this there is a bottle of Glenfiddich waiting. The only snag is you will have to come to Darwin to collect.
Growing old disgracefully
Julius