Pre 70 eligibility issue

[090]

The old boy is hell bent on making a down pipe for the cz360. It has a well functioning GMC side pipe work of art on it now. He just likes the look of a low pipe and wants the challenge of making one .  Any hoo... is it legal to put one on?

[albrid-3]

NO, it is not legal to put a down pipe on the cz, but it will change the look and the originality.

[JohnnyO]

I can't see any reason why it would be illegal.

[090]

They put up pipes on cr's in the early days. Most other bikes run the down pipe as well. Dave is there a rule behind your post? As I am after more fact than a personal opinion is all.

[Mick22]

NO, it is not legal to put a down pipe on the cz, but it will change the look and the originality.

Why not, which rule in the GCR's are you refering to ?

[firko]

Of course it's legal but please, please try a little harder to talk him out of it Brad. It's not called the sidepiper for nothing.

[Noel]

2010 manual of motor sport


18.3.0.4
Exhaust
a) May be modified but must generally follow original lines.
b) must be fitted with a silencer.

But I think I have seen pictures of Joel Roberts riding pre 70 CZ's with Down pipes,
and captions indicating he felt the side pipe got in the way of right leg???

picture's of bikes being used in the day should be enough for eligibility
but don't take my word on it

cheers
Noel

[090]

Of course it's legal but please, please try a little harder to talk him out of it Brad. It's not called the sidepiper for nothing.

You are right Firko. I will try and bluff him a bit. I am all for the side pipe bit. I quite like the quirkiness of the whole thing.
Thanks for your input too Noel.

[firko]

Of course, the rulebook!  We argued this out a few months ago over BigKs Husky pipe. The rule is there for sure but in my 22 years in vintage it's never been seriously enforced. If it had been enforced, 50% of the bikes racing would have had reason to be disqualified. In my opinion rule 18.3.0.4 needs an overhaul. The exhaust rules need to be there to prevent modern fatty pipes and such but to prevent changing a pipe with another period piece is silly.
 

[vandy010]

downpipes are period.
having seen the bike in question in the flesh,
your old man would want to do a bloody good job...
CZ + Downpipe = VMX

[DR]

Think back, they ran down pipes on dirt track bikes of all era's and all models so there is no way a downpipe could classed as a non period item. A technical loophole, regardless of whether it follows the original lines or not, it has to be legal I reckon so long as nothing altered beyond repair/restoration then good on your Dad for wanting to have the bike how he reckons it should be..it's all in the eyes of the beholder

[VMX247]

Hallelujah Brother Doc    

[albrid-3]

brad, as far as pipes there is no rules, there are fellow in usa that put late model pipes on bikes and they look stupid, you will need to curve the way your father is thinking.

[090]

You're a hard man to work out with the way you type things Dave.  I can't understand why you make reference to people in the USA putting modern looking pipes on and associating that with me or my father. My father simply wants to put a period looking down pipe on his bike. About the only real argument against it is that it won't be a side pipe any more ( by look ) . I love it the way it is but in the end it's HIS bike so he will do what he wants to do. It seems that there is no real eligibility issue though.

[DR]

Brad, no problem at all when you consider the pre'70 TS250 I have has a down pipe instead of an up pipe and it exits stage left instead of stage right..can't be anymore different from the original design but it's perfectly legal due to the fact it's era just like the CZ would be