Pre 81 MX class rules?

[Motu]

The 20in front has been around a hell of a long time,had a ridgid BSA C11 with a 20,my 1967 Cheney had a 20,always trying the size inbetween,must be a reason.That 23 sure took some effort to change line.

The classic guys in Auck aren't part of MNZ,are adament about not having competition licences,they used to have ''demonstration rides'' with no flags.Not too sure what they do these days.Most of the guys running the show are Westies KK,so you should be able to find someone local to set you right.

[Kwaka-Kid]

Wicked motu my dirt brother!

Where are they at? are you one of them?

hmmmm. interesting no MNZ? strange. i have a race licence anyway.

[laRIKin]

XR's had 23's in 79 and 80 and the XL's had them in 80 and 81.
Then the XR went to 21" front and a 17" rear
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I need to get out more

Thanks for that info.

It's funny really, how they some times play around with stuff on bikes.
And in the end after CADing it CAMing it and a room full of experts,
talking and deliberating about it.
They go back to the what was all ways their.
Makes me think that the old bike designers new what they were doing.

[laRIKin]

The 20in front has been around a hell of a long time,had a ridgid BSA C11 with a 20,my 1967 Cheney had a 20,always trying the size inbetween,must be a reason.That 23 sure took some effort to change line.

I was meaning on MX bikes.
They for you that may not know, tryed the 20" on MX bikes a few years ago.
You could buy one brand I know of (now not to sure Kawasaki) with the
option of the 20" front wheel.
It flopped and the wheel only work well on flat MX track's, from what I can
remember.

The bikes that you are talking about, were they Scrabblers or Street?

[Motu]

The Cheney was a hand built motocrosser,they are still made today - mine was built for Ivan Miller,the best Motocross rider in New Zealand in those days.It was actualy a 1968,I got that wrong.The C11 was a grasstracker,and the rear tyre I seem to recall was a Firestone Grasstrack.

KK,I was talking to Peter Groves a couple of weeks ago,he was involved at the very begining and is still riding in classic MX,in case you don't know who he is,he was the original owner of Mt Eden Motorcycles.Mike Fullerton is also very involved,last time I was speaking to him he was foaming at the mouth about MNZ and competion licences,I know some others out west too.

[Kwaka-Kid]

thankyou very much, know why does the name fullerton ring bells? strange.

anyways cheers again dude.

i now have another problem you might be able to help me with
the XR500 engine came with the right rear engine mount snapped off, like if you recall the engines (all the same those early honda singles) this was apparently not uncommon, and the top of the mount on the engine has pulled off.... what do i do, i cant be arsed pulling it to peices to split casings to hand my mate the case to weld... any other ideas? was just going to ride it the way it is... cant weld in place as all the rubber seals in the engine will melt. any advice really appreciated.

[Motu]

No 8 is a good Kiwi standby.The cases could still be welded by a brave welder with the gears still in - Graham Gordon used to weld Austin Maxi gearboxes for us with the gearbox still together...but he's a nut case,and they never leaked either.Don't know if you could find someone that crazy these days...unless you talked to Graham,but I doubt he does that sort of thing now.

[laRIKin]

[QUOTE=Motu]The Cheney was a hand built motocrosser,they are still made today - mine was built for Ivan Miller,the best Motocross rider in New Zealand in those days.It was actualy a 1968,I got that wrong.The C11 was a grasstracker,QUOTE]

Well there you go you learn something every day.
I new that some of the older bikes had 19's but did not know about the 20's.

I will have to do a seach on both now.

Cheney Racing

Ivan Miller

[Motu]

Good on ya - I know I got some tall stories...but they have a foundation in truth...somewhere....

[Firefight]

ma mates got a 21 inch complete wheel off an 80 XR500 A, havn,t seen it, but hes pretty good, he sorted Sudeep out on heaps of stuff , they want NZ$110.00 for it, left a message on your celly, but I know your too much of a tight arse to pay to get ya message, so let me know what ya wanna do

F/F

[Kwaka-Kid]

not only did i get ur msg but i left one on YOUR celly! :P


heh! baby davey banana boy

[Firefight]

not only did i get ur msg but i left one on YOUR celly! :P


heh! baby davey banana boy

sorry My Bad !! , will check my messages now !!

F/F

[Motu]

The 20in front rim may be one reason I didn't like the Cheney,I just made it a runner with a rough engine,took it for a few blats and couldn't be bothered again.I prefered the handling of my Rickman - this was made for natural terrain,the soft loam under grass and pine trees...made for sitting down feet up full lock slides on the deep soft berms that built up naturaly on corners,and the low but long jumps that aren't manmade,I just loved the feet up powerslides and standing on the pegs power stands.I never raced this bike,it was my street bike,but of course took it off road as well.

The Cheney I think was made for a different era - the begining of 2 strokes and man made tracks,it may of even been a one off for a specific type of track,it was short,light and quick steering,and the 20in wheel may have been part of the parcel,it was certainly a nervous bike to ride.

[pete376403]

If you're really desperate for a tyre for a 23" rim, speedway bikes since the year dot have used that size on the front. Might be a bit narrow for an XR at 2.75", but they are a reasonably blocky type tyre, bigger knobs than a trials universal but not as big as a full knobbly.
Also they used to use a 23" on the rear back in the '20's and '30s, the rear size was a 3.50" but the tread pattern was a bit weird - knobs arranged in a sort of "S" acrros the width of the tyre. "leapahead" was a favoured brand. However the rubber might be getting a bit hard, if you could still find one these days

[Kwaka-Kid]

yeah :S i would quite happily strugle around with the 23" on the front, but like i said availability of rubber, can anybody help s out and name any models of any brands that come in 23" to fit a 1.60 rim?

Also what are the rules on dates? i was fairly confident if i wanted to be in pre 81 the latest model part had to be pre 81, which is a shame because i also own a XR200R 1984 which has a 21" drum on the front, i think it would pop quite well into the 500 and i could just shove the 23" on the front of the 200 for when i needed the 21. But im worried the scutineers will know the diff and or pull me up for it. hmm what to do.