Bonneville America Forums Forums General Motorcycle Forums Other Bikes Trophy SS

If you are looking for a very ridable but fast classic Triumph go with a mid 60s TR6C. That model had a hotter cam and the single carb was better all round as far as idle and no need to balance. That isn't to say the twin carbs ran bad or idled bad but you had to get them dialed in together. Almost all my classic triumphs have single carb heads on them and I have several dual carb heads just sitting on the shelf. Pre-units are fun but need quite a bit of tweeking to keep things adjusted. If you get a pre-unit pay particular attention to the primary, they had a single row chain like the final drive chain and were notorious for chewing up the inside of the primary when the chain would get loose. Bell Engineering can rebuild the magnito if needed, if you don't care about keeping it origonal there is a point distributor you can install in place of the magnito if you can find one, I doubt they still make them. They stopped making parts for the magnito and generator on the pre-unit in the early 60s and haven't heard of any after market stuff. I haven't looked in quite a while since those units run for 50+ years once they are in good condition. Just some point and brush tweeks now and then.