GPz750 R1 wobbles under hard acceleration

I took the bike for the first time in a sportsbike group ride yesterday. Under hard acceleration the bike would wobble enough to force me to back off.

I had set the rear suspension hard (#5 compression, #5 damping). The swing arm bushes etc. seems ok but I had not stripped the bike and checked individually.

Is this a known characteristic of the bike? I do notice that the frame flexes quite a bit unlike my GPZ900R.

The wobbling can be seen in this vid:

You may want to check to see if the bike begins wobbling at a given speed even if not accelerating. There are quite a few things that can cause that problem including tires (which can look perfectly fine); steering stem bearings; forks that need servicing; etc. Ed

It kind of sounds like swingarm pivot to me .

You have to check the rear/front wheel bearings,air pressure in the tires,steering neck bearings,fork oil level,acts the
bike with different (soft/medium) rear suspension set the same? Steering damper installed?
Under hard acceleration the swing arm bushes are not in the same condition as proof by hand.

650ed wrote: You may want to check to see if the bike begins wobbling at a given speed even if not accelerating. There are quite a few things that can cause that problem including tires (which can look perfectly fine); steering stem bearings; forks that need servicing; etc. Ed

The bike runs fine up to about 130kph where the front starts to shudder. I suspect that the front rim is a bit crooked. But those acceleration happens well under 110kph

barney wrote: It kind of sounds like swingarm pivot to me .

Scirocco wrote: You have to check the rear/front wheel bearings,air pressure in the tires,steering neck bearings,fork oil level,acts the
bike with different (soft/medium) rear suspension set the same? Steering damper installed?
Under hard acceleration the swing arm bushes are not in the same condition as proof by hand.

Thanks. It seems like I have to check everything carefully and might do this when painting the swing arm.

The 750R1 is the nicest handling twin shock four about imo, although the 1100 with the longer wheelbase is a bit more stable at warp speeds.

Any of the above plus maybe tyre mismatch or defective shock dampers. Go careful here, a tankslapper can be lethal,

I remember when those things were new, and the testers were complaining about the handling, and they actually shimmed the swingarem and re-torqued the steering head.