CR 250 Question

[fatboyracing]

Hi Guys,
Can some one please help me and tell me the difference between the 1984 and 1985 model CR Honda 250
I have an eligibility question and I would like to know the difference if any

cheers
Fatboy

[090]

Cosmetically to tell the difference by looking at them?

http://100megsfree4.com/honda/h0200/cr250r.htm

[STW996]

Shane, easier to say what is the same!

The 125's are generally the same but the 250's at completely different.

Tank including air intakes
Seat
Rear guard and side plates
Air box
Engine cases (mounting at swingarm, is a bracket on 84 will the 85 is moulded with insert)
Barrel including ATAC is cylinder mounted on 84 and is a canister (like 84 125) on the 85
Flat slide 85 v round slide 84
Rear shock is different (not just spring colour)

So as I said not close

[fatboyracing]

Thanks Shane and Brad,
That has answered my queries
I thought that they were the same must have been getting confused with the 125

Thanks Guys

Fatboy

[VMX247]

MA could probably afford to have an era eligibility CD data base made up for the Dirt & Classic Nationals etc. 
cheers A

[Nathan S]

I believe that the 85 seat/tank and side covers go straight on to the '84 bike (and visa versa).

Arguably, the shock doesn't matter as there are no limitations on shock absorbers in pre-85.
Flat slide carb is much the same deal - providing the 85 model's carb was available in 1984 of something.

So really only ("only"!) the motor is a problem, as I see it.

[evo550]

The '85 and '86 250's are close (at a glance)

[STW996]

Nathan, I am sure it is as easy as bolting on the 85 sub frame to the 84 but that does not make it a carry over item, it is different and that is the point.

The moter is very different, outside of the crank, electics most other parts are different. If you ride an 85 v 84 you can pick the difference straight away.

Point taken about the shock as you can put on a performance shock anyway.

Shane, you would be right with the125's very simular.

[090]

Shane, you would be right with the125's very simular.

Not to look at.Only the front guard is the same cosmetically.Very easy to tell apart.
As far as '84 bits bolting up to '85 bits, I have never done that particular exercise but Honda's tended to make a lot of things different. Sometimes just slightly. I would bet that a seat and tank might sort of fit but won't really. Two examples are 85 and 86 cr500 tanks and shrouds look exactly the same but they are different and will not fit. 82 and 83 cr480's are similar and some things will fit but lots won't.

I believe that the 85 seat/tank and side covers go straight on to the '84 bike (and visa versa).

Arguably, the shock doesn't matter as there are no limitations on shock absorbers in pre-85.
Flat slide carb is much the same deal - providing the 85 model's carb was available in 1984 of something.

So really only ("only"!) the motor is a problem, as I see it.

I don't see the point in saying this or using 85 parts on an 84. An 85 shock may bolt up but is way too long and it will look like a chopper.And wouldn't you be limited to a pre '85 shock or an after market one?

[Nathan S]

And wouldn't you be limited to a pre '85 shock or an after market one?

When would it make sense to allow 2011 made aftermarket shocks but prohibit 1985 made production shocks?

From the very earliest days of VMX, shocks have been considered consumables, so can be swapped freely with other shocks - imagine having to try to find and race with original shocks on ANY of the pre-75 bikes...
The older bikes have limitiations regarding travel and remote resevoirs, which is fine.
Those restrictions do not apply to Evo+ bikes: Any shock is acceptable.

I guess the point I was trying to make is that if we want to have rules enforced sensibly, then we need to look at the bike as a pile of parts, just as much as we look at it as a complete bike.

[090]

When would it make sense to allow 2011 made aftermarket shocks but prohibit 1985 made production shocks?

Same as any other era is my thought. Can't put pre 78 style shocks on a pre 75. But you can buy new period style ones.
I was using that theory. Also the fact that its a part off a pre 90 bike. But like you said , shocks are consumables so I will say its a shit idea as there are plenty of options to keep it real and specifically in this example won't fit the bike...properly. Also pulling apart the rules to suit an argument is a negative. One should be saying that putting 85 parts on an 84 bike is inappropriate ( for want a better word).

[STW996]

Brad, sorry I should have said engine wise they are simular.

Guards, seats and tanks I would think are not performance parts (save for major changes like the 82 and 83 model 480's).

I would agree that use of differing era parts should not be condoned (newer to older class)

[fatboyracing]

Hi Guys,
I would like to put together a data base of bikes from year to year,changes etc great help when scruttenering bikes at nationals and state level etc.
Any one want to help or start would be great
I am learning the differences with evo/pre 85 bikes
All this info would help me with commission dutys too.

Cheers
Fatboy

[Rossvickicampbell]

FB - if you want a hand setting up an excel sheet for it let me know - I volunteer - if you want to go properly and do a database - sorry I am rusty there!

[Nathan S]

Hi Guys,
I would like to put together a data base of bikes from year to year,changes etc great help when scruttenering bikes at nationals and state level etc.
Any one want to help or start would be great
I am learning the differences with evo/pre 85 bikes
All this info would help me with commission dutys too.

Cheers
Fatboy

Sounds like a great idea.

What sort of format are you thinking of? Pics of each year model + written blurb to explain the things to look for?