Here is my story. Short version...I currently have a Walsh 250R and would not trade it for the world.
I grew up (now 40) never riding bikes or quads because there was never anyplace (that I knew of) to ride them. Then in 1998 I lived next to a large (for northeast) sand pits and had a chance to buy a quad. I got a 1998 Blaster brand new. Loved it at first, but quickly grew beyond the limits of the Blaster plus I wanted my wife to ride with me. So in 1999 I got a new Banshee, telling the wife I would sell the Blaster. Well, once the two of us went riding together I knew I could keep both. Around that time (fall of 1998) NEATV was starting to race again. I went to watch that first race at Southwick and knew I wanted to race motocross.
All that was at the track were 250R, Banshee and LTs. I put a set of PT pipes, nerfs and kill switch and hit the track that next season. Loved it. I was having so much fun racing the Banshee. That snappy 2 stroke power was awesome but the suspension was stock and could not take tracks like Southwick 5 times a year. It was either upgrade the Banshee or get one of those 250Rs I saw all over the track. All the top guys rode 250R, except for one guy on an Outlaw framed Banshee. So I started my search after the season.
Went to look at a couple but they were pretty beat. Then a co-worker came by my desk and saw the picture of my quad. We started talking and she mentioned that her boyfriend had a Honda "something or other" that he wanted to sell. Well, that weekend I went to look at the quad. It was an 89 TRX250R, kinda beat and the clutch side was removed. He said it ran and would sell it to me for 2 grand. I wanted something in better shape, but I brought it. It needed some work, but I stripped it down to the bare frame and rebuild it. Cracked frame, bent shock, all new bearings, new top end etc. For the next 10 years or so I raced that 250R when ever I could. Raced right up to expert class finally settling in the old timers classes.
When my son got old enough to race the "Sport 15" class (which allowed 250cc 2 strokes) he shared that 89 with me. Finally it was time to get another quad, so I found a Walsh 250R in awesome shape with everything I dreamed on it. I brought it with the intentions of letting my son race the Walsh after he gets a full season on the 89 250R, but by the end of the year he wanted a 4 stroke like every one else. So I gave him the choice, either buy a current model 4 stroke or build a Walsh hybrid. He loved the Walsh handling and we decided to build the Walsh CRF quad and sell off the Banshee and 89 250R.
So while there is a 4 stroke in my garage, it is only the motor. The chassis is all 250R!
Reasons I will never switch
1) Most important is the fun factor. Riding the 4 strokes feel lazy. From trying friends race 400ex back in the day to the Walsh CRF. Just does not have the same feel.
2) Cost. My son, knowing nothing about motors, did a complete top end in 1 1/2 hours the first time! Try that on a 4 stroke, for $150 too!
3) Weight. Two identical chassis with different motors. And I HATE pushing that 4 stroke pig around the garage.
4) Jumping. I have jumped my Banshee about 75 ft on the track years ago. But never in race conditions. Now the 250R just flys so nice.