I did this also and kept breaking rear mounting studs, I removed the rubber and now about 1000 miles later and never another broken stud.
I guess it works for some but not for some as well, mine seem to do much better for reliability with a good solid mount to the frame instead of a flew joint that cause the studs to be over stressed from the vibration of these engines.
to each their own, and what ever works, that is good!
Originally Posted by bobdeezy
aye i've built three bikes now. each one better than the last. i have left most mods alone but one thing i recommend to everyone is to lessen the vib with old tubes. i cut the tubes to size to fit between the mounting clamp and frame. it kills alot of vib but is thin enough to provide a strong mount