Hello, and a SF2 question, if I might

eyeguy

eyeguy

Junior member
Location
London- where the streets are paved with gold
Hi Everyone

I've just taken delivery of a SF2, one that's been standing awhile. I had a very nice SFC replica until last year, the one classic boke often use as an image to show a SFC, idiots. If I've sussed it, a picture here:
sfccloseups008.jpg


My new bike is not quite so shiny (!) but I hope it'll prove a little more useable, the SFC a'like was the most uncomfortable bike in the history of motorcycling.

The new one:
SF2atdealers006.jpg


Now, it looks as though the rear subframe has been cut at some point and a new loop later welded in. Cut just behind the shock mounts, of course. Do any of you guys have, perhaps, a photo of the standard frame setup and maybe offer a suggestion why he cut the frame (racing seat?) Airbox is off, too, with velocity stacks and the tyres are completely shaggerised, I suspect he might have been Luigi burnrubber...;0))

I'd appreciate any input.

Cheers

A tutto gas!

Paul
 
the upper tubes of the chassis are cut off at an angle just aft of the shock mount
the rear loop slides into the cut tubes and is welded in place
this tube has the tabs for the seat mounts and the rear fender

if this image isn't enough i can snap a closer image from another frame
with dimensions, etc

welcome  :D

cheers,
scott
 

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Hello Paul
The rear frame loop is the thinnest part of the frame (only thin part!) and is easily bent in a crash. It would have been easier to replace it than try to straighten if such was the case. It could have been removed for a racing seat but I think it unlikely as it provides a good support for a racing seat as it comes.
That is a very nice standard SF2 you have acquired. Do you intend to keep it fairly standard?
Cheers from a fellow SF2 rider.
Lee
 
Hi Lee, thanks for that. Stanrd condition? yes, mostly. Having endured the SFC alike I'm looking forward to a more normal riding position. I hope to simply recommision it, it always seems a shame when a nice old bike has all its history removed, to me anyway. I'll need a new RHS exhaust silencer, the OE fitment is badly dented and the collector box/balance pipe looks a little worse for wear. Do I get those from Mr Wagner? how much !! The rest looks like normal fare- cables, fork seal etc. I'll probably fit electronic ignition, too, I've usually found that to be a night and day change on old bikes and the alike had one. Any suggestions?

Its certainly been over, perhaps that explains the subframe damage.
According to the history its only covered 6000km from new, certainy, the tyres are the original fitment, which is quite scary.

Thanks guys, I really appreciate your help and comments and will keep posting, fear not!

ATG
paul
 
if replaceing the under gearbox balance box, be a little wary,the original is quite a complicated thing,with internal vanes and baffles to ensure both a mixing operation and some more silencing.There were two types from the factory, the first did not bend "up" high enough and a later version did just that and was "scalloped" to give clearance around engine components,but still not enough there are copies about that have no internals, and your bike wont run too good if you just bolt one on, a better solution is to buy pipes with a balance tube near the head, and make some short angled adapters to join the pipes to the silencers, a bit of jet fiddling and you have a sweet bike with much needed ground clearance.
CLEM
 
Very nice machine. Congrats.
All 750s used regularly with a pillion and even more so with a luggage rack will break that rear frame loop.
Ciao
Paul
 
It?s quite common to run pipes straight to the mufflers without any collector. The noise is usually acceptable. We used to increase the last bend to raise the pipe and weld on a stub to suit the muffler. It keeps the standard look pretty much. If you really like to corner hard the standard collector is a real pain and I have seen many bikes crashed due to it. I couldn?t live with it. However there are plenty of SF photos here on the forum with the collector in place and you could confirm with Paradies if their collector has standard internals.
I think the Witt ignition is popular and I think someone pointed to the Czech Ignitek being available to suit. I have a modified Suz unit on my racer and points (with reduced advance) on my road one.
I?ll bet those tyres are not easy to get off. Are they Metzeler C66?
Cheers
Lee
 
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