helle fellow 3 wheelers I have a sheet of 3 wheelers and how fast they are supposed to go and it say the 84 R should go 74Mph stock and the 82 65Mph what i can tell they are pretty much the same exept plastic and 2 teeth on rear sprocket so what gives?does the 2 less teeth on the 84 make a 9mph difference? thanx.

 

is it up front or in back is it 2 less teeth?

it would matter that much im not big into atcs but changing the gearing on a bmx bike take out 2 teeth in the back you will have a hell of a lot more topend ,should be the same with a atc

 

DUDE YOU NEED TO LOOK ALOT CLOSER,,, THE FIRST GENERATION 250R'S ARE NOT EVEN CLOSE TO THE 83-84'S,,,, there not even on the same planet,,look at the tire sizes too,,, published top speeds are just a guess...

 

it is 2 teeth smaller in back i know and because i am curious i thought the engines were the same correct me if i am wrong the rear tires for the 83 84 is 22x11x8 the same for 81 82 the front tire is a 23.5x8x11 on the 83 84
but the front makes no difference really.

 

the early ones are air cooled, while the later ones are liquid cooled.

 

as far as i can tell 81-84 are air cooled 85,86 maybe 87(not sure about 87)are liquid cooled and thanx for all the replies

 

I have a 1981 CR250R engine in a Shifter Kart,It's liquid cooled.SER #M303E 230086. Double checked with Honda.

 

The 81-84 are air cooled .. 85 was first liquid cooled ..
81-82 sprockets were 44/13
83-84 sprockets were 42/13


Engine code for 1981 CR250R is ME03E-2300045 -

 

OK then explain why Green Country Cycle City of Broken Arrow,OK(an authorized Honda dealer) told me it's a 1981. Also after I talked to them I tore the engine down, and lo and behold, there is a Wiseco piston with the part #466MO6750 (1.5mm oversize) . So I ordered a piston from Wiseco, same part #. Wisco listed this piston with the following product description. (466MO6750-Honda CR250R 1981-1983 2658CD.) Someone needs to explain,because I sure would like to know?

 

as far as i know you are correct on the cr they are liquid cooled 78-80 was air cooled 81-newer are liquid but it is interesting why they advanced the cr before the atc