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GS550 gearbox noise help

Chuck78

Chuck78

Forum Sage
Past Site Supporter
On my wife's 77 gs550b, her original engine was getting a little low on compression, and the gearbox would get stuck in neutral from time to time and not shift into gear when traffic lights would turn green... We got a 78 gs550 engine with like-new compression, and swapped it in. Shortly after, this bike started getting stuck in first gear, and would not go into neutral or second.

A little while after that, it started making an intermittent loud knocking noise at idle or low speeds (engine and road speeds both). I am pretty certain this was coming from the gearbox as well. The bike was way up on power after the swap (pods/straight thru Dunstall glasspacks/rejetted), and was run through the gears very aggressively on many occasions. In my very limited knowledge of these gearboxes, my only instinct was thay maybe a shift fork was bent and sticking somewhere in there.

Anyone have any diagnostic speculations or tips or insight on this??? It's otherwise a very solid engine.

The original with the occasional stuck-in-neutral problem is on the bench for an eventual teardown and total rebuild with GS650 cylinders/pistons/head to make it a gsxr carb'd 9.6:1 673cc mill, so I'm trying to figure out what's wrong with both gearboxes.

Thanks for the guidance.
 
Clutch hub nut may have come loose and now fouling the shift linkage. Worth a look anyway.
 
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