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I have most of the gears NOS from the 500, list the part numbers you want and I may have them, they do share some gear just not all.
That has been assembled with total lack of care in the pasty and a different bottom end is the way to go rather than attempt a salvage job
Quote from: Bryanj on April 04, 2018, 07:23:49 AMThat has been assembled with total lack of care in the pasty and a different bottom end is the way to go rather than attempt a salvage jobWith Bryan on this one. Just by the pictures, it needs a lot more than a couple of cogs
Quote from: Trigger on April 04, 2018, 07:43:25 AMQuote from: Bryanj on April 04, 2018, 07:23:49 AMThat has been assembled with total lack of care in the pasty and a different bottom end is the way to go rather than attempt a salvage jobWith Bryan on this one. Just by the pictures, it needs a lot more than a couple of cogs Yea I get that, but the rest of the Gears are fine so is there any point replacing all of them? Bar the Roller Bearing housing pins can you suggest what else I should be aware of? I really appreciate all the help.Thanks
Yep, as if the bearing has spun in the casings, they are well and truly bug**ed. Basically a "Bottom end" is a complete engine minus head and barrels
I'm not sure if a bottom end IS the way to go TBH, there is a lot of damage sure BUT the problem is the new bottom end isn't guaranteed to be any better unless it comes with one of course. TwoWheelSpares on E-Bay have some complete engines but no bottom ends, your never sure on what the crank shells are going to be like on another engine, his may be new but they don't transfer as we know unless your really really lucky.Really blowing the pics up shows what I suspect has happened, just above the mainshaft 3rd gear where it is missing 2 teeth there is another tooth with just the leading edge missing, I suspect this came off, jammed between the gear teeth just below it when second was engaged, this would mean this gear cluster was sitting to the left, when the 2 teeth came off they were in close proximity to countershaft second and they jammed between the 2 gears, would explain why no teeth are missing from mainshaft second, which is puzzling as you'd expect them to be meshed but again I think maybe third was in the process of being selected. The selectors look fine, which again is puzzling as you'd expect them to be the cause of this but they clearly aren't. Maybe the PO was a bit clumsy and started the process by catching the 3rd gear tooth edge. Looking again at the pics you can see new damage just under the primary chain and again to the left of that, these were no doubt the result of all the debris getting flung out of the gearbox. I'm not convinced the bearing spun in the casings, I've never seen them do that before even when the knock pins are squashed flat to the case as in this case, I'd like to see some pics of those bearings in detail to say for sure though, if they had I'd expect to see some damage to the knock pins and I can't see that. I'd also think about just replacing the entire box, https://www.ebay.co.uk/itm/Honda-CB550-CB-550-K-F-Four-1974-1978-Gearbox-Gear-Box-Assembly/332536863177?hash=item4d6cbdd9c9:g:V5oAAOSwzRFabzr4If you just buy a bottom end your going to need a complete set of gaskets as well, plus some time stripping both engines to see if there is any damage. However I'd also point out that the damage caused by crushing the 2 knock pins can sometimes be significant, I'd like to see pics of the sprocket area from the outside to see if the pin came through the casing and also of the clutch area for the same reason.
Those both look to be recent breaks, has the engine been apart recently?