Hi Chris
I've just posted up on the CCM site about tank possibilities but regarding your specific point, as far as I know the problem is more the other way round.
The older Rotax engine has a large cam drive tower on the left hand side (it uses a belt drive) and this may well hit the bottom of some other tanks. CCM were using this engine when the PD tanks were made so it fits.
The current Suzuki engine is much more compact around the cylinder head so clearance shouln't be a problem. Everything else seems to be much the same - frame, mountings etc - so I would guess that it would go straight on.
On a more general point, there always seems to a degree of bodgery needed when fitting aftermarket tanks. Even on my ex factory CCM one I had to make a new bracket for the horn and another for where the seat mounts onto the tank. I had to fabricate a complete secondary mount when fitting a 40L acerbis tank on an XR600 and if you've read Chris Scotts report about his XR650L trip a few years ago you'll know that he had to do much the same.
Most of the mountings seem to be fine for tarmac travel but fragile for off road and for what you're doing minimising the possibility of overstressing the std mounts with a few kms of corrugated piste would be high on my list of things to look at.
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