That is amazing. It looks brilliant! Best and most ambitious project I have seen involving a Sport Classic. Have a Sport 1000 myself.
How dos this swing arm compare to the original Sport 1000 swing arm and the S4R swing arm? Length, width, wheel center and so forth?
I have always thought of the S4R swing arm as perfect for the Sport 1000, but newer had the guts to even look for one because of the suspension linkage. Seeing your project might make me reconsider
Would the original single sided shock mount (monoposto) look totally bogus on a S4R swing arm and is it even possible.
And what about the exhaust tube near the second cylinder exhaust exit when compressing your shock? Same suspension travel and room or?
It's hard to see what you have done with the exhaust there, but I'm running Zard Titanium (2 on one side, not the NCR model), and that construction might create a problem with the suspension linkage under the seat?
Sorry for the many questions but this project is fantastic and makes me wanna strip my bike straight away!
Thanks Sig, I'll answer as best I can and please feel free to ask as many questions as you like.
The internet is a wonderful thing. I've seen a couple of single sided swingarm (SSS) projects for the SC; Eight Forty Eights', the German one you linked and a few others since I started this, and while I'd love to claim "first", in reality this is concurrent innovation. Lots of people have thought about this kind of thing I'm sure, luckily (or crazily!), I'm neck deep in this build now.
I didn't do any research on the SSS modification before I bought the bike, but had the swingarm for a 749/999 project I was working on. Suffice it to say, when I mocked it up on the SC for fun, I just knew it had to be done. The bikes name, "Catch 22", really says it all...
November marks the 19th month of slow but steady design and engineering on this. The conversion wasn't a simple swap out, but surprisingly wasn't as hard as expected, just time consuming. The length, width and wheel center have been designed to stock specs. I can't really say what modding the S4R swingarm would involve, sorry, but at least that swingarm has a lower suspension linkage built in. In my case the rear shock has been replaced with a fully adjustable one, for better performance and to suit the reduced travel. I think the standard side mounted shock would look great, as it does in the German build, but I'm after a different aesthetic. The main issues were the swingarm mounts and the exhaust headers, all of which are custom.
As I've promised earlier in this thread, I'll detail the whole build, especially rear suspension linkage and exhaust headers with pics, as soon as possible. The swingarm was finally painted earlier in the week, and exhaust returned from getting coated today, so when it's all back together, I'll take extensive photos and do a full write up, just need to find the time and a good camera! After lurking here for so long I feel its definitely time to give something back to one of the best forums around.
Next up on the seemingly endless list following that is the front end, so new forks, axle, brakes and custom triple clamps including dials. Wheel choice is still keeping me up at night though, want to keep the classic appeal...
And if you think this is ambitious, check out SM70's race-spec Sport Classic, or Eight Forty Eights' build! Visionaries are everywhere
Cheers - Andrew (Las)