su carb conversion

[jay760]

Just found this on ebay, su carb with 2-1 manifold.

http://cgi.ebay.co.uk/xs650-su-carb...em&pt=UK_Motorcycle_Parts&hash=item2eaf159dd8

and these amal coversion manifolds for that real old look (bloody expensive though)

http://cgi.ebay.co.uk/Yamaha-xs650-...em&pt=UK_Motorcycle_Parts&hash=item3cafd12638

 

[Inked Monkey]

How would that first one mount? I would think it would run straight into the backbone. That second set is just plain wicked though

 

[inxs]

- the SU could be from a sidecross bike or maybe they used a double cradle frame

 

[OakBehringer]

What performance effects does a single carb conversion have? Do you loose much horse?

 

[inxs]

- supposed to increase torque at the expense of top end rpm...one of the supposed differences between a tiger and a bonneville...looking for a different performance profile

 

[OakBehringer]

I'm not claiming to be an expert, but I don't think that makes sense. Horsepower, as I understand it, is torque x RPM (divided by... 5250 I think?), so increasing torque will increase horsepower at a given, same rpm.

 

[inxs]

- yes, i meant drehzahl...rpm in particular in the upper ranges...have corrected

 

[angus67]

wow. nice bike in that second link. excellent polish work.
Unfortunately, looks like the parts they send are not polished. Yuo'd think for that amount of jingle, they could throw it under a wheel, eh?

 

[jay760]

Seen an xs frame with a single carb conversion with the center post cut out between the top and mid rails then triangulated to put the strength back in the frame, though not sure wether it had a complete new top tube.

on the second bike they also make the large exhaust clamps for that old cafe racer look

http://cgi.ebay.com/ebaymotors/Yama...5411170QQptZMotorcyclesQ5fPartsQ5fAccessories

 

[Crab_Cake]

Seems like a terrible idea. I have had a lot of SU carbs on different cars and they are always a PITA.

Our Mikunis our much easier to work on.