Welcome to the forum!
It has been done... I've seen it talked about here in the past. Keep patient and update your thread often - hopefully someone with more info will eventually see and respond.
As far as width - +2+1 a-arms in front with a pair of 1-2" spacers or a 2-3" extended axle in the rear makes this quad very stable and not at all tippy (with 660 engine but my VERY heavy butt up top on the seat!)...
I don't know what, if any, difference there is in weight between the 660 and the R1 engines, but at least they're down low and so contribute less to lateral instability than a heavy rider, IMO.
'01 660 Raptor, Burgard +2+1 arms, YFZ Shocks, LSR anti-vibe, CTR pipe, jetted, K&N
'01 Polaris Scrambler 400, K&N
'02 Honda 400ex, Big Gun pipe, jetted, K&N, Lonestar +2 A-arms, Lonestar anti-vibe
'04 Suzuki LTZ400
'16 RZR XP4 1000 Turbo
Last edited by QuadManiac; 04-28-2019 at 08:34 PM.