not in my experiance at all. my bike has a 68-72 arm on it, with a factory gen 2 busa shock. the shock is heavier, but is also progressive. gen1 busa shock might be better on a short bike but the gen 2 works best for me. its also a little longer so you have to be a little more picky with your flat link geometry when you get one.
with a longer arm you have a bigger lever, so you need a heavier spring. the busa shock has a 850# i beleive, gen 1 is 800. have to check my numbers but i think thats right. you can pick up a gen2 busa shock for 60-150 dollars, so why not try it? i did and it works just as good as a penske.
if its long enough. its got a heavier spring and is made for a bike thats much heavier. by making your arm longer (woking the shock with a longer lever) you basically make the shock think its on a heavier bike so it works like its supposed to... if that makes sense???
I got a 07 1k and we thought a busa shock would fit but it was too long. I picked it yo from here. It's off a 08 busa its also the silver area top and bottom were painted black. I'll sell it for 70 bucks tyd if any interested. Also we tried everything just would not work its just about 2 in longer then my stock one.
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