1980 gs1000g

[Nessism]

Yes, try my Honda CB1100F, shims under buckets, 2 cam chains, 2 cam chain adjusters. Royal PITA...Hard to imagine Suzuki started using "under the Bucket" in their 2007 Bandit 1250's.... For me as rare as spitting a shim is, they tried to fix something that wasn't broke, and just caused more problems... Also don't try to make me believe they did it to save wgt. on the valve train... That's what Kawasaki said back in the early 80's when they did it.

KZ650, which came out in 1976, is shim under bucket. It's more stable and lighter. Racers guys put the 650 buckets into their big KZ's for that reason.

[rphillips]

Wondering if there were ever an estimation of how often the shim over bucket would spit a shim, I'd say never without excessive over revving. But however rare it was, the under bucket took care of it, just added 3 or 4 times longer to adjust the valves at every valve adjustment...

[ironbiker]

Airbox removed,carbs rejetted..running pods..same creeping idle after all this changed,still looking.

[Nessism]

How many turns open are the pilot screws, and did you perform a vacuum sync?

[KiwiAlfa156]

Wondering if there were ever an estimation of how often the shim over bucket would spit a shim, I'd say never without excessive over revving. But however rare it was, the under bucket took care of it, just added 3 or 4 times longer to adjust the valves at every valve adjustment...

Well, you'd think to flick a shim it would have to be in serious valve float/bent valve territory


In his book Croz: Larrikin Biker, Graeme Crosby wrote about the 8-valve GS superbikes he raced (including the XR69) were sensitive to rpm limits, and lunched their valve-trains if they over-revved (no rev limiters back then). A missed gear was blown engine and a guaranteed DNF. And these were proabley fitted with shim under buckets.

https://www.classicmechanics.com/book-review-graeme-crosby/

https://www.motorcycle.com/features/archive-suzuki-xr69.html

[ironbiker]

Found a split boot on right side....only 5 years old...

[Nessism]

Found a split boot on right side....only 5 years old...

Just like I said: air leak.