I am in the process of doing the same to my naked FZ, have ordered custom made clipons and have a second fz top triple clamp,i am planning on cutting off the bar risers.
I have been in touch with yamaha and this was their reply:
Dear Simon,
We do not recommend grinding the handle bar riser from the steering clamp
as it may affect the strength of the triple clamp. The clamping of the
original handle bar could also assist in adding strength and rigidity to
the triple top clamp.
We feel that it would be best to find an alternative after market top
triple clamp to match the clip-on handlebars.
Regards,
Duilio Pianca
Customer Relations Department
Yamaha Motor Australia
I reckon its mainly ass covering from yamaha..
My brother works for an oil company, he had a couple of the mechanical engineers there to look at it and they reckon it shouldn't weaken the structure too much, but, because it is a cast unit, it may have a problem with a stress fracture forming where you cut it. He said its important to round off the edges of the cut, this will apparently reduce the chance of a fracture.
Im going to get it done at a pro shop, know they'd do a better job of it than me with my angle grinder
