Only the 87 250x had adjustable a-arms. If you wanted to stay with stock arms, they would be a good set, but most people now put 400ex a-arms on. The 87 also had the stupid front bolt pattern(4X110). Glad Honda got their heads on straight and went back to the standard 4X144.
I actually like the reverse on the 250X better. You can actuate it with your foot, instead of having to cross your arm over to get to it. The chike on the 300ex is a litle more hidden, but after you do it a couple times, your hand just finds it.

 

OK people, for all of you who rode the short bus to school- here's the 411 as follows:

The following specifications were published in Honda's 1991-1992 service manual:
Displacement: 246.4cc
Engine: 246cc single-cylinder, air-cooled, four-stroke, SOHC, 4-valve
Carburetor: 36mm
Transmission: manual clutch, Close-ratio Five-speed plus reverse
Brakes: triple hydraulic disk
Fuel capacity: 2.2-gallons, including reserve
Front suspension: 6.7-inch, double-wishbone, aluminum wheels
Rear suspension: 7.9-inch, swingarm, aluminum wheels
Length: 67.7 inches
Width: 43.5 inches
Dry weight: 361.6 pounds
Wheelbase: 1,225mm (48.2")
Front Suspension Travel: 170mm (6.7"), double wishbone, adjustable preload
Rear Suspension Travel: 200mm (7.9"), decarbon-type damper, adjustable preload

Model: 2000 TRX300EX
Engine Type: 282cc air-cooled SOHC single-cylinder 4-stroke
Bore and Stroke: 74mm x 65.5mm
Carburetion: 32mm piston-valve with accelerator pump
Wheelbase: 45.3 inches
Front suspension: 6.7-inch, double-wishbone, aluminum wheels
Rear suspension: 7.9-inch, swingarm, aluminum wheels

So we see that suspension trvel is complimentary- but the fact stands that the 250x has 4 valves AND a larger carburetor- which, by default means more power and, consequently- more speed. Furthermore, we see that the wheelbase is also longer, thus contributing to a better and more stable ride.
Thank you--

 

They have the same wheels base, and use the same head(at least according to the Clymer manual the 300ex has 4 valves)
I think you rode the short bus

 

I have seen different specs on the wheel base for the 300ex and 250X. But I have both sitting in my garage side by side, and they look the same. Also the overall length is the same. I would like to try the 250X 36mm carb on the 300ex. Probably a nice power booster.

 

36mm carb ? Better frame geometry? Are you guys making this up? The 87 250x did have the same front bolt pattern as the rear and I think they may have added the accelerator pump around 2000. Top speeds are so close its not even worth arguing over.

 

Tpo on the last post- it's a 34mm carb. As for better goemetry- I couldn't swear to it. However- it's a fact that the 300ex has 2 valves and the 250x has 4 valves. The hot ticked would be to put the head and carburetor from the 250x on the 300ex.

 

I have seen the head from a 98 300ex and it had 4 valves. So either the previous owner swapped it, or the 300ex has 4 valves. Also, the Clymer manual shows a head with 4 valves.

 

Hmm-- can't believe it. Had to be a swap in. Just got my hands on a Honda brochure, and it lists the 300ex as having 2 valves. [img]i/expressions/face-icon-small-disgusted.gif[/img]

 

kwackermann
So, do you have any hands on experience with 250x or 300ex. or are you just quoting from brochures and web sites?
I am going to go pull the valve adjustment covers on my 300ex, and I will settle this arguement. From the outside, the 250x and the 300ex motor looks identical, with the obvious exceptions.

Has anyone else had their head off their 300ex. Maybe early 300ex had 2 valves, and the later ones have 4.

 

This website has a lot of info on the 300ex
http://www.atving.com/editor/review/...0ex/review.htm