extended swing arm on cbr 600 f2
#1
extended swing arm on cbr 600 f2
hey everyone new guy here i streched my swing arm 12 inches over im running into a major problem i have a stock shock and a stock dog bone but the linkage from the shock to the dog bone is off a 92 f2 and it raised my bike sky high my kick stand dosent even touch the ground anymore how can i lower my bike to make up for the extended swing arm please help thanks everyone
Last edited by streched 94 cbr 600 f2; 06-07-2010 at 09:20 PM. Reason: pic
#2
Pic is worth a bazillion words, but the dogbones for a 92 and a 94 F2 are the same, as are the suspension rockers. All identical parts numbers on the Honda microfiche.
Shock lengths are the same on all F2's, although the 94 shock has a remote reservoir where the 91-93 didn't.
I think what you're seeing is that you extended your swing arm a foot, so by the nature of geometry, the downward angle of the normal rear swingarm is going to continue 12" further. The tire still has to sit on the ground, so it means you jacked the rest of the bike upward at the pivot point.
Look at these crudely-drawn triangles I just whipped up - the top is the stock bike, and the bottom is one with a longer rear link. A is the same length on both. C is the ground and can't be changed. Making B longer (your extended link) on the bottom triangle affects the angle of A - it is steeper (This is your head angle getting twitchier). Notice the distance between c (ground) and the top of the triangle is a lot taller (distance between the ground and your kickstand). C is only longer because you've stretched the wheelbase of the bike, which is a byproduct of the extension.
You need a lowering linkage to get the angle of the swingarm flattened back to where the bike doesn't have it's *** up in the air.
Shock lengths are the same on all F2's, although the 94 shock has a remote reservoir where the 91-93 didn't.
I think what you're seeing is that you extended your swing arm a foot, so by the nature of geometry, the downward angle of the normal rear swingarm is going to continue 12" further. The tire still has to sit on the ground, so it means you jacked the rest of the bike upward at the pivot point.
Look at these crudely-drawn triangles I just whipped up - the top is the stock bike, and the bottom is one with a longer rear link. A is the same length on both. C is the ground and can't be changed. Making B longer (your extended link) on the bottom triangle affects the angle of A - it is steeper (This is your head angle getting twitchier). Notice the distance between c (ground) and the top of the triangle is a lot taller (distance between the ground and your kickstand). C is only longer because you've stretched the wheelbase of the bike, which is a byproduct of the extension.
You need a lowering linkage to get the angle of the swingarm flattened back to where the bike doesn't have it's *** up in the air.
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