I found Evans at a local store, for an affordable price. Plus, I finally fitted high capacity radiators.
When I finally did a re-bore, I fitted a waterproof Spal fan (though, I'd only gone through 2 of the 'puter fans, due to dust / water), but retained one of the 'puter fans. Nothing really worked to entirely stop the boil over. I doubled up on catch tanks - KDX and WR ones at the rear, then a Gas Gas one that went around the steering head. Modified the impeller to have longer vanes, with a water pump spacer. Ported the various inlets and outlets of the coolant system, and the water pump.
I made various inline aluminium coolers, through to (near) entire finned aluminium lines, that looped back, down then back up to the radiators, which added about 300ml to the coolant capacity, plus the extra 'radiant' capability. Various coolants ( including Engine Ice), other than Evans - as, I did Not want to 'hide' the problem, and have the engine 'cook in it's own juices' - and none, cured the 'kettling'. It's used as a single tracker, extreme terrain torque monster, so it doesn't get much airflow through the radiators. My 500 2T has been a 'kettle' since I've had it. So, in that state, it probably is a far lesser coolant than Engine Ice, and other high performance coolants. But, it no longer has the same properties.
