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I've just bought a 2016 450 SX-F. On first ride there were a couple puffs of blue smoke so I decided to re ring the piston. The bike has an Athena ECU and apparently had a high comp piston - I didn't know whether to trust the guy I bought it from and didn't want to have to do any re tuning by...

I've read the horror stories and now it’s happened to me :frown: Out for a ride the other day when I noticed the engine getting a bit tappety. Started riding home, then lost a load of power. Got it back to my garage, took the rocker covers off to give them a check. I could have fitted all of my...