My experience with the k&n's coming off equates to two factors. Firstly the supplied Clamps aren't wide enough and therefore make it very hard to hold the filters on evenly.
So the best thing you can do is buy clamps that are the same width as the part of filter that sits onto the carbs.
Secondly, once you have the wider fitting clamps, just make sure the filters are sitting as far as poss onto the inlet side of the carb and that the clamps on unseen side of the carb (inside) are fully even and in contact as the visible side is.
If you don't do these two basic things, the problem begins because the rubber of the filter where it clamps onto the unseen side develops an indent memory due to it's softness making it very hard to re-alighn properly afterwards.
In other words the clamp sitting more on the edge of the inlet side of the carb will have a tendency to slip off the more you tighten due to it not having full contact.
In short buy wider clamps the same width as what sits onto the carb, and ensure the inside sits fully onto the carb as you would the outside before tightening the clamps.
Do it properly the first time and you will not have a problem cos of the memory imprinted on the soft rubber of filter. Do it incorrect and you will continualy struggle to keep the filters on the more you tighten the clamps.
It's hard to explain tapping away here so if you need further claification, just ask but I can guarantee if you do it correctly this way the first time, you won't have a prob again with the filters coming off.
Btw, I learnt the hard way ie: bought another set of filters and started again.
Staffo
