This is my first Instructable after using many ideas from the site, so go easy on me.
Having owned numerous Yamaha Motorcycles over the years, one thing they have in common is nasty Carb intake rubbers. Over the course of time they go hard, they shrink and the break up. This makes refitting the airbox inordinately difficult and it is usually found unattached the next time you take the tank off. Here is an instructable showing how I replaced the knackered rubbers with sexy Silicon hosing
Step 1: Step one, the size of the problem
I then measured the depth of the lip on the original intake rubber, In this case it was 10mm (from the edge to the obvious ridge in the photo. I had a further 15mm to where it butted to the airbox. I then added 5mm to allow for shrinkage and to provide a "push" from the tank to hold things in place more securely
Step 2: The first cut is the deepest
Step 3: The second cut is just as deep
There you have it, a cheap remedy for an annoying problem