Frankenstein, 1984 CR125 with an 81 XR200 engine

[justanothercgrader]

Hi guys,

Whats your opinion of such a build for motocross ?, i already have both the donor bikes.

It could be used in the Pre 85 250cc and open class
Or 50 years and over class, that me.
Or Pre 85 125 cc class?, back in the day i thought that up to 200cc four strokes where in the 125cc two strokes class , or am i dreaming?

It would look similar to this,
http://i252.photobucket.com/albums/hh23/mcphotonut/200right03.jpg


Your thoughts, Mark

[09.0]

I can't help but think what a lot of work for such a big loss....

[Doc]

if you're factoring fun into the equation it wouldn't be a bad thing

[Slakewell]

Fun Fun Fun I had a XR 200 engine in a 84 Husky frame and I'm building a new one in a RM / N frame the bike was slow but I smiled the whole time and on single track Vinduro there fast remember XR 200 won enduro's in the 80's

[Nathan S]

What does it do better than a stock 84 CR125?
You'd get smashed by the 250 MXers off the start. While you will be able to reel in some of the slower riders over the course of the race, it would take an exceptional set of circumstances to get more than half way through the pack.

Not legal for the 125 class, BTW.

[mick25]

All depends on how much grunt you want, I would rather put a 1980,81,82 XL,XR500 donk in a CR250,500 1984 frame

[Tony T]

What does it do better than a stock 84 CR125?

It would sound better........ 

[justanothercgrader]

What does it do better than a stock 84 CR125?
You'd get smashed by the 250 MXers off the start. While you will be able to reel in some of the slower riders over the course of the race, it would take an exceptional set of circumstances to get more than half way through the pack.

Not legal for the 125 class, BTW.

But won,t they all pull over when they see the awsomness of it?

The CR125 i have is only a roller,

Although i dream of it being unique, i certainly dont want to get lapped in the first lap either.

[mustanggrahame]

No it wouldn't Tony. My 84 125 sounds sweet. It even has usable bottom end power (surprisingly). I don't think an XR200 would get near it anywhere. I don't remember an XR200 winning anything. Good for learning how to ride, then move on. How would you fit a carby and air box on it?
Cheers, Grahame

[NSR]

Go for it.  It will be great fun. 
You won’t get the holeshot but you won't be to far back, then when all the 2t’s are on the brakes you will still be on the gas and you will be able to out brake and turn in under most 250s.  You won’t be worn out towards the end of the race and you will finish in the about same place you would if you were on any Pre85 250. 
With a big smile on ya dial.   

[crossedup2]

In 1992, whilst working at the 6 days in Cessnock , one of the workers had a multi hybrid CR/XR/XL that was actually registered (as a XL185).
If I remember correctly, it started as a XL185, then grow a big bore XR200 top end, then rebuild again with big cam and piston, then went into a stock CR125 frame, then worked the suspension, To cap it off he made all this stainless stuff to bling it up.

Sure on the transport sections it would have been a dog but I was told once he got to the single track everyone was minced.

I'll never forget the sound when he started it up. The crack in the exhaust was very similar to the moderns now. Sure it cost him a bomb, but fun was in the making it and making it go.

Would I do one of these Frankensteins, in a heard beat! Most of the fun is in the dreaming!

Peter B

[Tony T]

I'm with Noel, I reckon it would be a hell of a lot of fun to ride unless you're my size. 
But the bottom line is if you reckon it will be fun to build and ride, then it's a good idea.
Do it! 

[mustanggrahame]

An 84 CR125 would have about 32hp. An XR200 has 18hp. It weighs more and the weight is higher up. It would use less fuel and have a less vulnerable exhaust. If anyone can ride a hybrid like this very fast it is because he/she is a very fast rider, not because the bike gets faster with about half the horsepower.

[BAHNZY]

I'd build it just to sit in front of the Coonara with a 6 pack of Jimmys and talk shit about how I holeshotted every race coming home in the top 5. Like most of us we've won more races on a Thursday night after a few cans than Bill Nilsson ever did. Agree it wouldn't be a championship winning bike but it old be a hell of a lot of fun and would generate more campfire bullshit than a standard CR125!
Go for it.

[NSR]

If anyone can ride a hybrid like this very fast it is because he/she is a very fast rider, not because the bike gets faster with about half the horsepower.

Your right but it’s all relative.  
You would have to time the rider on the 125 and then time the 200, this is the only way you can know if the bike is faster or slower for THEM.  I would bet you would find there would only be 1 or 2 seconds difference either way.  If the rider is not that fast my money would be on the 200.