"Out of interest, can a spare belt be purchased from the likes of Gates for the Dynamoregulator kit? Or is it a special one only available from Dynamoregulator?"
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That is a common question that comes up a lot. Most places making these kits will tell you their belt is proprietary. (MAP cycles says this frequently...)
See:
http://www.mapcycle.com/categories/transmission-primary/belt-drive/belt-drive-kits/map2001-triumph-650-750-twins-1969-deluxe-belt-drive-kit.html( i have used a number of these kits and am a huge fan of them, very nice quality, well worth the money)
See:
http://www.mapcycle.com/tech-source/ I look fwd to when they update this, over the years they printed some really amazing tech materials that were availible to dealers and the public, I hope they reprint some of them as well as update.
But I posted a number of links to Gates tech files and others and if you research this, there is several types of teeth patterns and you have to match that, in addition the construction of the belt varies. Many industrial types while robust are NOT suited to a auto-cycle application. So, I doubt you will find a kit manufacturer will readily offer you up a cross reference list of suitable replacements from other vendors,
But nobody making these kits are making their own belts. As I said before, a designer uses off the shelf materials and then makes whatever adapters to make it work. In limited cases some pulleys or other speciality stuff might be farmed out to machine shop to be specially made (My wife's employer makes all kinds of components for other companies)
But to answer your question,,, YES,, YOU CAN FIND OTHER BELTS,, its up to you to research it and find the right one. Emphasis on RIGHT ONE.
The tech on this stuff is readily available on the internet and the quality gets better and better every day.
Some people are slow to adapt to this, but I personally LOVE the belt drives on some of my other vehicles.
15-20 years ago people would have scoffed at the idea of a Belt final drive on a high performance sport bike
but the belt drives on my Buells are rated at 60,000 miles and some literature suggests lifetime service but in reality most people change them around 20,000 to 30,000 miles which is amazing when you think about it. Some luddites swear that a chain is better and actually swap back to chains on HD & Buells and I had this argument 2 months ago where I was told that no way could a belt final drive cope. I pointed to my XB12SCG which if you believe the Dyno print out is over 130 hp and nearly as much torque. (I believe the dyno was optimistic) But thats pretty amazing if you think about it. Fully active suspension, over 100hp and no issues with the belt.
So, yes Virginia, there IS a Santa Claus! (Sorry, off topic here) but point is, you can find a product that will work and pretty cool that such things are now available.