I have a 250cc 1984 Model 300 trials bike, has not run for about 5 years. Had starting problems that worsened to the point of being parked. Pulled it out to freshen it up and start using it again. It had no spark, so I pulled the flywheel to find a sheared crank key. Cleaned that up (minor galling), checked and had spark again, so put it back together, cleaned carb, changed oil, etc. Couple of kicks and it nearly started, then kicked back like an old motocrosser would (ouch) and sheared the key again. Does anyone have the proceedure for checking/setting timing on this model? Are parts available? The pickup has been changed in 1991. Also are there “numbers” available for testing the ignition components…any help would be appreciated.