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I don't have a 450, nor have I had a Suzuki twin (yet 
) so that part is unfamiliar to me. Perhaps someone will be along to confirm, but it looks similar to a choke plunger seal to me, I would remove the bolt below that rubber seal and soak the whole thing in hot water to soften the rubber, I bet it just slides right off the plunger. Don't dip any rubber that you aren't going to replace. That's another thing I like about the heated ultrasonic cleaner with Simple Green HD in it, I clean all the rubber bits, and even the slides, being careful not to get the diaphragms too hot but the Simple Green doesn't break the rubber down, the heat softens it so be more easily removed and the ultrasonic blasts any crud around the sealing surfaces away.
I'll also soak my bowl gaskets in the heated cleaner and re-use when they are flat and complete. I don't think I'd reuse that. It's to deformed and cracking around the outer sealing edges. It's enough work to get them off - to have to pull everything off again if it leaks would be a real bummer.
I suppose you could try to test it off the bike by filling it up without the valve seat and needle in there temporarily and try to keep it level - perhaps lightly clamped in a vise like the guide shows while testing the float heights to see if the bowl gasket leaks, but if it's too full it will flow out of the main jet.
) so that part is unfamiliar to me. Perhaps someone will be along to confirm, but it looks similar to a choke plunger seal to me, I would remove the bolt below that rubber seal and soak the whole thing in hot water to soften the rubber, I bet it just slides right off the plunger. Don't dip any rubber that you aren't going to replace. That's another thing I like about the heated ultrasonic cleaner with Simple Green HD in it, I clean all the rubber bits, and even the slides, being careful not to get the diaphragms too hot but the Simple Green doesn't break the rubber down, the heat softens it so be more easily removed and the ultrasonic blasts any crud around the sealing surfaces away.I'll also soak my bowl gaskets in the heated cleaner and re-use when they are flat and complete. I don't think I'd reuse that. It's to deformed and cracking around the outer sealing edges. It's enough work to get them off - to have to pull everything off again if it leaks would be a real bummer.
I suppose you could try to test it off the bike by filling it up without the valve seat and needle in there temporarily and try to keep it level - perhaps lightly clamped in a vise like the guide shows while testing the float heights to see if the bowl gasket leaks, but if it's too full it will flow out of the main jet.
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