Hello boys and girls. Long time reader, first time poster. Love the site, hoping for a little experienced feedback....
Finally starting my engine rebuild during the long Canadian winter, gathering parts. Plan: 1216, 11:1, port, 30/26 valves, stock 86-88 1100 gix cams, 38CV's(with Lee's stepped jet-needle washers, thank you), Hindle 4-2-1.
My questions are:
- Regarding the increased weight of oversized stainless steel valves over oem, is it enough to warrant stiffer than oem valve springs? I'm thinking if I use titanium retainers this may keep the valve train weight close to oem so that oem springs are sufficient? stock cams/lift.
Anyone know the difference in weight between a 30mm or 26mm ss valve vs the oem 28.5mm, 25mm?
(I want to avoid using heavier springs if not absolutely necessary to avoid the increased wear on the cams, rockers etc.)
- I have yet to pull my head and measure the valve guide slop, if any, but assuming I go with new guides, any opinions on best re-fittment? I am thinking bronze guides from APE or Kibblewhite which don't require re-boring the head. The other option is using new cast oem guides which requires re-boring the head I believe. Having a shop do it either way so mainly wondering which guides are better for longevity assuming they both seal equally well. Also, can I even use oem cast guides with stainless valves?
Thanks for any opinions/feedback!
Neal
I've attached a pic of my bike. It's a '91 with 2011 gsxr1000 front end I put on, Robby Moto triples.