I have a 1985 VF500F that is lurching from about 6000 rpms and up. I think it may be due to the chain on the bike. It's pretty old and I think...
Not sure if you changed them yet. Here is the site I used for my vf500f. Perfect fit. http://www.v4market.com/86-VFR750F_c_29-2-3.html
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