Bored at work and thinking VMX

[DJRacing]

I was thinking about the evo class (we call it pre81 over here) and the poor Honda boys dont have an open classer unless you are lucky enough to have a big bore Mugen barrel and head. I think that is a shame and was wondering if the 1981 CR450 barrel and head fitted on the 1980 CR250 bottom end? I know this is probably bad taste and goes against the grain(especially for me) but it just seems a shame that the evo era open class in basically void of Honda's. The '81 CR450 wasnt a good bike and over here it is rare to see one racing. I dont know if many race over in Oz but with the CR480 and 500 being such good bikes it probably leaves the '81 450 unwanted and unused. Now this is where I really do want to kick my own arse even for just thinking it, but can the '81 450 motor fit in the 1980 CR250 frame? Shit I know what I'm saying and its just making me cringe, even my beer is tasting strange now, but unless you have loads of $$$ for mugen equipment the Honda boys must feel left out in the cold.
A question for you..... "If a 1980 CR250 with a 1981 CR450 motor turned up at a club day would you let it run as a evo open class bike"?
(VMX gods forgive me as I know not what I say)

[Noel]

DJ,
being a Honda, you only need it to be a 125 or 250 
to be competitive against the open class bike's of the others,
Noel

[Quicksilver]

Can the '81 450 motor fit in the 1980 CR250 frame?

Gee's that would be nice. I have 3x CR450 engines in the shed,  just the thought of your idea gets the mind wondering into dangerous thought pattens. Although the most weird idea I ever came across was a bloke who claimed he was slotting a CR500 engine into an Ultralight aircraft. Madness.  

[DJRacing]

Can the '81 450 motor fit in the 1980 CR250 frame?

Gee's that would be nice. I have 3x CR450 engines in the shed,  just the thought of your idea gets the mind wondering into dangerous thought pattens. Although the most weird idea I ever came across was a bloke who claimed he was slotting a CR500 engine into an Ultralight aircraft. Madness.  

I know I said the CR500 was a good motor but I dont know if I would trust it that much??


Noel, I know with you piloting a 125 the big bores would be in trouble 

[Maico31]

DJ there has been a guy here turn up with a 480 motor (basically same as 450) in a 250 frame and it got canned straight away. Personally i would allow it at a club day but it does go against the grain of the rules in vintage racing. And yeah it would be good to see some big bore Honda's in the Evo class.

[Maico31]

Hey Quicky have you got any other CR450 bits? I'm restoring one and there's a few parts missing.

[090]

You're drinking thinners again DJ, that would account for the silly thoughts and the funny taste

[Quicksilver]

 

Hey Quicky have you got any other CR450 bits? I'm restoring one and there's a few parts missing.

Im restoring one too mate. I think I have everything I need except swingarm bush kit and some decent plastics. PM me your needs I dont have much in way spares ( just engines ). Might have something you need.

[Quicksilver]

How did Bigk build his. Itsnt that a 450 barrel on 250 bottom. Or something like that.

[Tim754]

Fit a CB500 /4* in the frame would be legal. *(The 500 iron head DOHC twin was a lump) Tim

[090]

That was a big effort to do as gmc had to change the bolt holes to start with.

[Quicksilver]

That was a big effort to do as gmc had to change the bolt holes to start with.

Was the 450 crank used also Brad?

[DJRacing]

Maico31, I can understand the 480 getting the short shift, but the 450 motor wasnt the best and since it was only made for one year it just seems a waist (like Quicky says, he has 3 of them in the shed doing nothing). Could it be called a Noycey rep? But only with the 450 motor.
(I feel ill, what the hell am I saying ) Yep your right of course about that it is against the grain of VMX and I hate the idea, but still at the end of the day....... it would be good to see more bikes out there doing it and if only for club days a Noycey Rep would be a Honda lovers wet dream (wouldnt it??  )
Brad we run out of turps 3 days ago but I found this stuff called methys....     

[Maico31]

I'd love to have a 450 Honda in a 250 twin shock frame, it'd be a trick bike. I even had a 360 Mugen for a while but it was a slug against 490 Maico's and YZ465's so i sold it and bought a Maico.

[DJRacing]

Thats exactly what Im saying Maico31, if I was a honda guy I would feel that there is just something missing, and its the evo big bore. I bet there are a few Honda boys out there that would like a bike like this.
I have to stop drinking this methys..... I cant find the safety of the yammie room