who was the sado-masochistic nutter that invented these things :dunno or then made em so friggin weak & easy to damage. :rant Hope yours is not too bad A303Subject to confirmation that all bikes are the same (Mines a 2000 model).
Maybe sir Spoonz can confirm for definate ?.
Maybe sir Spoonz can confirm for definate ?.
All of the 990 cc Rotax engined bikes use the same Sprag clutch but the housing alters between some of the years.
The pegaso uses a completely different sprag design.
Someone asked about why use a sprag if it breaks. You have to really with a big compression bike. Unlike a car or IL4 you can't directly drive the engine from the starter for several reasons.
firstly the starter would have to be too big to have the power to overcome the compression directly. You would have to go through some gearing down to have the capability.
Secondly a big twin or single is prone to kick back. Ask anyone who has kick started a big offroad bike and they will have tales of bruised or broken legs from kick backs. On a direct drive system that kick back would directly be transmitted to your starting mechanism. As a double saftey the Aprilia has a knock sensor to help prevent it but it's not immune especially if your starting on a low batt. With a sprag there is only drive in one direction so it can't happen. It ain't perfect but no one has come up with a better idea yet that i know of.
The pegaso uses a completely different sprag design.
Someone asked about why use a sprag if it breaks. You have to really with a big compression bike. Unlike a car or IL4 you can't directly drive the engine from the starter for several reasons.
firstly the starter would have to be too big to have the power to overcome the compression directly. You would have to go through some gearing down to have the capability.
Secondly a big twin or single is prone to kick back. Ask anyone who has kick started a big offroad bike and they will have tales of bruised or broken legs from kick backs. On a direct drive system that kick back would directly be transmitted to your starting mechanism. As a double saftey the Aprilia has a knock sensor to help prevent it but it's not immune especially if your starting on a low batt. With a sprag there is only drive in one direction so it can't happen. It ain't perfect but no one has come up with a better idea yet that i know of.
Joined Aug 2008
3K Posts | 0+
Brittany France
Hope the BMW part is compatible, German engineering standards are far higher than Italian standards.
Keep us posted on your progress on getting that confirmed.
Keep us posted on your progress on getting that confirmed.
Amb, the BM part is off an F650, which uses a Rotax engine, so it's probably the same Austrian-built part!
