The No Go Climber
Posted: Sun Jul 05, 2020 7:01 pm
Hi,
Thanks for allowing me into your forum.
I have recently purchased an 89 aprilia climber. After decades on enduro bikes, I thought I'd give trials a go. The bike test rode well. I thought it needed a clutch but that seemed an easy fix (whole different story there) and I got it cheap. When I got it home i was riding around the paddock when suddenly I heard the grind of the flywheel letting go. This is where my problems started. Turns out the bike had been fitted with a new HPI ignition system. For some reason, the guy who fitted it had tack welded part of the old flywheel onto the new one? I'm assuming he was trying to add weight. Unfortunately it was a stupid, badly done idea and it spun itself apart.
I have since reinstalled the flywheel, as per specs - the extra bit.
The stator is mounted on the cover not the motor, there does appear to be some spacing issues which affect how close stator sits near flywheel. This issue is not mentioned in the manual - nothing that should stop it starting but will need to be sorted. The previous owner appears to have tried to fix with stacks of nuts as packers.
My problem is that I cannot get the bike to start! The best I can get is an occasional backfire.
• The bike has got spark.
• I've checked the disc valve timing. Looks ok, however because of backfires I have rechecked timing several times.
• I have pulled down, cleaned and rebuilt the carb.
• Put in a new plug and fresh fuel.
No result. I have spent days on this. I'm very familiar with motorbike rebuilds etc but have not had a rotax before. I'm at a complete loss as to what's going wrong! Any suggestions appreciated.
Thanks for allowing me into your forum.
I have recently purchased an 89 aprilia climber. After decades on enduro bikes, I thought I'd give trials a go. The bike test rode well. I thought it needed a clutch but that seemed an easy fix (whole different story there) and I got it cheap. When I got it home i was riding around the paddock when suddenly I heard the grind of the flywheel letting go. This is where my problems started. Turns out the bike had been fitted with a new HPI ignition system. For some reason, the guy who fitted it had tack welded part of the old flywheel onto the new one? I'm assuming he was trying to add weight. Unfortunately it was a stupid, badly done idea and it spun itself apart.
I have since reinstalled the flywheel, as per specs - the extra bit.
The stator is mounted on the cover not the motor, there does appear to be some spacing issues which affect how close stator sits near flywheel. This issue is not mentioned in the manual - nothing that should stop it starting but will need to be sorted. The previous owner appears to have tried to fix with stacks of nuts as packers.
My problem is that I cannot get the bike to start! The best I can get is an occasional backfire.
• The bike has got spark.
• I've checked the disc valve timing. Looks ok, however because of backfires I have rechecked timing several times.
• I have pulled down, cleaned and rebuilt the carb.
• Put in a new plug and fresh fuel.
No result. I have spent days on this. I'm very familiar with motorbike rebuilds etc but have not had a rotax before. I'm at a complete loss as to what's going wrong! Any suggestions appreciated.