I was pretty hesitant putting it into the cooling system, can be mixed with 5% water or something but its pretty strange stuff.
In my RG150 it took a good 15c off the barrel temps when racing compared with the old stuff I had in it so I was pretty pleased.
Thats if the pumps are ok to push that sludge..
I suppose the squish must've been a fair bit different between the two cylinders, I'd never measured it before until I put the heads back on last time and was shown how with a bit of solder on the top cylinder from memory.
I'll see if the guy who machined them can help me out (also works and preps RS125's and 150 2-strokes). It was his son who was on it when it seized, an experienced rider thankfully who managed to keep it upright and probably saved it from more damage.