FIY this is BLASTERFORUM not a WHAT SHOULD I DO FORUM or OPINIONS FORUM, we help people for the most part about how to fix there blasters, and you since your on blaster forum everbody here is generally say keep the blaster or a 2 stroke quad, now if you go to a forum thats for a wide range of 2 & 4 stroke quads of different makes, then youll get a good mix of opinions.
There is a lot of bias on this forum, but I will say that he got a pretty fair idea of what to get from quite a few people. I mean hell so far he has asked to trade for:
250R: Yes....duh
Raptor 350: Slower but if you want a 4 stroke, I guess it's alright at slow speeds
Raptor 250: I know little about them...probably handles better than the 350 but slower
Raptor 660: Yes...duh
400ex: Yes
Scrambler 400: No in my opinion
300ex: Pretty much the same as raptor 250 but a little faster. I'd favor a 300ex over a Warrior/Raptor 350 but that's just me. I'd rather have the handling than the little bit in power.
He definitely needs a stock quad that is in decent shape and probably won't get any trade offers unless it's a 250, 350, or 300ex. Most people won't trade down, so I don't know what the retard with the Raptor 660 was doing. His dad and himself are not mechanically inclined and need this list:
1: Stock
2: Bulletproof powertrain
3: 4 stroke torque
As far as I'm concerned, that sums a 400ex with it's low tech, air cooled, and relatively low performing engine. It handles well, is reliable, and has torque.