Hi all, My rear wheel axle is way too tight (thanks dealer!)
I can get the bolt to turn on the right, but it is spinning the bolt on the left.

Do I just need a 22mm spanner to hold it back?
It has been done up with the left hexagon bolt having one of the points digging a groove into the aluminium spacer/adjuster.

Is it meant to lie flat on an edge? and how easy is it to get a new aluminium spacer?

Thanks for that. What is the tension plate? Is that that block pushing the wheel back? Also is there any potential damage to bearings I need to worry about?

The tension plate is what you called the aluminium adjuster plate. Like Pepsi said, I wouldn't worry too much about the bolt digging into it. Mine has the same indentations from the nut. I generally try and make sure that there is a flat side of both the bolt and nut against the adjuster rather than a pointy bit.

The rear axle torque should be around 110Nm (If I remember correctly) which is pretty tight if you are trying to undo with a short handle socket, so it might be that the axle was correctly torqued. I use a 12" breaker bar to crack the nut on my axle and have to put a fair bit of effort to do that.

I would have thought the bearings are sound unless its been torqued to some ridiculous rate!, but worth checking if you have the wheel off. I tend to check mine each time the wheel is off.

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Reading the above again, it sounds like you're axle is inserted the wrong way round? The bolt head end of the axle (which locks against the adjuster) should be on the right as you sit on the bike and the axle nut should be on the left.

I have seen a couple of instances where the axle has been slid in from the chain side, rather than the disc side giving rise to the same "spinning axle" symptoms as you describe.

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I did have the same problem and had to buy a new alu spacer at the dealership. It was correctly torqued and with the flat side of the bolt against the spacer.

Some idiot at Yamaha made the spacer out of alu instead of steel, just like the axle. Because of the high torque the axle digs into the softer alu spacer.