I've been reading back over this debate this morning and I think that we've all made our thoughts pretty clear on both subjects. I found one small point that Nathan has raised a couple of times that I feel needs to be questioned.....
I know plenty of people with pre-75 racers who won't race them (or race them very sparingly) simply because its too hard to find parts.
This is a total Furphy. I've been around vintage motocross for 24 years and have built a large and varied number of bikes. During that time I've hardly had any problem finding parts. My 350 Maico is extremely rare, only 100 or so made and I've never been at a loss for parts for her. With the exception of Elsinore transmission parts and TM125 ignition covers, I can't think of many parts that aren't readily available for most bikes. I'm certain that some forum members will bring up some parts that can't be found but with the internet becoming the worlds biggest bike shop, you'd be pretty unlucky if you couldn't eventually find what you're looking for. I'll give you a couple of examples.
*I'm about to undertake a rebuild on a comparitively rare Kawasaki F81m engine. These bikes were released in 1971 in extremely limited numbers to the point that today, they are amongst the more desirable and rare Japanese MXers. Before I receive the engine I did a 'worst case scenario' hypothetical rebuild, checking around looking for parts needed if the engine was bad enough to warrant a total rebuild. What I found was that I could source
every single engine part needed for the rebuild, including a NOS ignition cover.
*Alan Jones destroyed a clutch and clutch drive on Black Betty at the recent Nepean Pre '75 meeting. It doesn't take a nuclear phycisist to understand that 1957 Jawa unit construction scambler engines are beyond rare. There are only three in Australia to our knowledge and Alan owns two of them. Anyway, he found the NOS parts needed after two or three emails.
*I did a full nuts and bolts concourse restoration on a '68 DT1 for Yamaha Australia and with the exception of a correct pattern rear tyre (
Which Doc eventually found for me, thanks mate), a rust free seat base and correct white rubber grommets for the wiring (
which I've since found) had no problem finding every part needed.
Name any bike you choose and I reckon you would eventually find the parts needed to restore and/or modify that bike. Pre '75 does indeed need some surgery to bring it back as a force in our movement but to scare potential pre '75 entrants off by offering up the old "you can't get parts" chestnut is both wrong and misleading.
I apologise for this being a tad off the subject but Nathan raised the point as a part of the debate so felt that this thread was the only place to make my reply.