Hi, im a bit curius about the chain slack 7mm.. feels a bit to loose for me..anyone got any thougts about that
Best regards[/img]
Best regards[/img]
Chain tension
14 posts · Started by smackman · 25 May 2007
Post 2 by limeyduffa,
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Post 3 by rog,
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Post 4 by limeyduffa,
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Post 5 by Plipton,
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Post 6 by Twisted Jester,
#6Plipton, that hasn't been done yet, I read an article about that system and I believe it's BMW that have a patent on it, I can't remember how it's done now but something about switching a couple of transmission parts around from the normal way they're configured to enable the sprocket to be mounted in the same place as the swingarm pivot, I'll see if I can find it.
Post 7 by Twisted Jester,
#7Sorry my mistake, there were two parts to that article, BMW were showing a prototype enduro bike, the patented part was for the clutch to be mounted on the crankshaft rather than the gearbox primary shaft.
The swingarm sprocket thing was apparently used previously on Bimotas.
Here's an extract
The clutch is mounted on the same axis as the crankshaft, rather than as usual on the gearbox primary shaft - a format which has been patented by BMW (although a similar layout was used by the Honda Cub 50 several decades ago!), and results in smaller overall dimensions and reduced power losses, as well as freeing up space for the frame design.
However, the prototype debuting at Å°lsen featured a more conventional but still distinctive chassis layout, with four mounting points for the motor. This sees the pivot for the aluminium swingarm mounted co-axially with the gearbox sprocket, a system previously used by Massimo Tamburini on his Bimota designs for four-cylinder Japanese sportbikes from 1973-83, and for the same purpose as here on the BMW Enduro, to ensure constant chain tension at all times, for longer life and to reduce chain snatch. This in turn permits the use of a softer rear shock which, like its KTM and Husaberg rivals, does not use a linkage
The swingarm sprocket thing was apparently used previously on Bimotas.
Here's an extract
The clutch is mounted on the same axis as the crankshaft, rather than as usual on the gearbox primary shaft - a format which has been patented by BMW (although a similar layout was used by the Honda Cub 50 several decades ago!), and results in smaller overall dimensions and reduced power losses, as well as freeing up space for the frame design.
However, the prototype debuting at Å°lsen featured a more conventional but still distinctive chassis layout, with four mounting points for the motor. This sees the pivot for the aluminium swingarm mounted co-axially with the gearbox sprocket, a system previously used by Massimo Tamburini on his Bimota designs for four-cylinder Japanese sportbikes from 1973-83, and for the same purpose as here on the BMW Enduro, to ensure constant chain tension at all times, for longer life and to reduce chain snatch. This in turn permits the use of a softer rear shock which, like its KTM and Husaberg rivals, does not use a linkage
Post 8 by scotsduke,
#8hi guys can anyone tell me how they adjust there chain. when i do mine as the book says(7mm) i feel it is to slack.any thoughts out there
Post 9 by chipsngravy,
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Post 10 by scotsduke,
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Post 11 by Nickeluring,
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Post 12 by 9nine0,
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Post 13 by Andy,
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Post 14 by No. 47,
#14Your right the chain does tighten when you sit on the bike, thats because the front sprocket is lower than the pivot point on the swingarm, mine looks slack when parked but dont be tempted to over tighten it you can do a lot of damage and premature wear on bearings and sprockets, and your right it will effect the suspension travel if over tight.
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