I've got an IMS 6.6 on a Gen 1, love it, easy & quick on/off, a little more capacity - what's not to like!?
Safari tank - on my back-up KLR, I installed a humongous Safari tank that came with a KLR I bought from mc salvage. This tank is huge. I've not yet filled it up all the way, but although it's advertised as 32L, I've read guys report it balloons over time, and can hold as much as 38L! In this pic, I've marked the 15L level:
Mounted on a Gen 1:
Front view on my Gen 2:
Here's a shot of the clearance to the exhaust (could benefit from a heat shield IMO). Note the stainless steel cross brace to support the bottom wings of the tank:
I used a piece of thin inner tube between the cross brace and frame downtube to prevent damage:
The US webpage for Safari claims the tank is compatible with both Gen 1 & 2. That's not quite true - the Gen 1 rad fan sticks back further, jams against the tank, wears into it over time, makes the tank difficult to push forward enough to get the bolts in (won't line up easily). I made a "low profile" fan, taking the fan motor out of a Gen 2, putting it in to a Gen 1 fan bracket, soldered on a Gen 1 fan connector I robbed off a bad fan assembly:
This is the clearance I got by doing that:
I got a genuine 500 km range on one tank with the IMS 6.6 on my Gen 1. I should get close to 800 km range with the Safari!
KLr650 safari fuel tank Safari Tanks USA
Edit - just remembered, installing that Safari tank on a Gen 2 wasn't totally plug 'n play, it is necessary to remove the AIS and cut the mounting bracket for it off: