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Doms CB550F1 project
Bryanj:
Again looks ok apart from dreaded rtv jointing which has killed many honda engined after blocking restrictor jets.
Take everything out, remove ALL the orange krap an thourouly clean everything.
I would plastigauge the crank and check clearance.
REMEMBER to keep all shells in the place they came from
DomP:
--- Quote from: Oddjob on September 10, 2023, 03:34:06 PM ---Far better than I expected Dom.
You need to rotate the gearbox and take another pic, although it looks fine in the pic posted there could be damage underneath we can't see.
Shells don't look that bad TBH, some minor pitting, most likely from contaminants in the oil sitting against the shell when it's been stood. Crank journal we can see looks ok.
Primary chain looks toast TBH, but check with the tank track test and see what it looks like then. Strip the engine completely, if nothing else it needs a really good clean.
Gear selectors look fine.
Anything sitting in the sump? little bits etc.
Looks like the dreaded red hermetite or instant gasket, really plastered it on either way.
Can you see the crank markings? the printed letters and numbers? What are the letters on the back of the lower crankcase as that will show what colours you should have fitted, well within 2 colours anyway.
Need more pics but looks good up to now.
--- End quote ---
All conrods are marked E and 2, the lower crankcase is AABBB, all of the gears are clean when rotated, no chips or marks. The sump had some fragments of hardened rubber that I assume must be from the camchain tensioner although there is a tiny bit missing from the nylon oil deflector (?)
While I'm in here I think for the sake of £48 I might as well do the primary chain, clocks show 32k if I trust they are original, or the engine for that matter as I've not checked. Replace al oil seals and bearings too?
DomP:
--- Quote from: Bryanj on September 10, 2023, 04:57:20 PM ---Again looks ok apart from dreaded rtv jointing which has killed many honda engined after blocking restrictor jets.
Take everything out, remove ALL the orange krap an thourouly clean everything.
I would plastigauge the crank and check clearance.
REMEMBER to keep all shells in the place they came from
--- End quote ---
Yes I'm moderately pleased with what I've found, glad I cracked it on too! Looks like I'll be needing your cylinder reboring services Bryan, would it be jumping the gun to go ahead and get it to you? IMD or David Silvers piston kits? Obviously I'll hold off on them until you know how much oversize you have to go.
I'm still tempted by a cam reprofiling while it's all apart if it will be a worthwhile improvement, if my pocket allows!
Bryanj:
You can bring me or send the block, i dont do any blasting, cleaning or painting thats down to you.
Put up a pic of the inside of the lower case and lets see how much the chain has et away, 550 usualy less than 500.
Mileage dont mean much on an old bike, it could have babied or totaly hammered, i know the primary dampers are as expensive as the chain but they will be rock hard now so need changing.
There will be markings on the crank for pin sizes but if you cant find them bring up the crank and i will mic it for you
DomP:
--- Quote from: Bryanj on September 10, 2023, 07:12:57 PM ---You can bring me or send the block, i dont do any blasting, cleaning or painting thats down to you.
Put up a pic of the inside of the lower case and lets see how much the chain has et away, 550 usualy less than 500.
Mileage dont mean much on an old bike, it could have babied or totaly hammered, i know the primary dampers are as expensive as the chain but they will be rock hard now so need changing.
There will be markings on the crank for pin sizes but if you cant find them bring up the crank and i will mic it for you
--- End quote ---
Ah don't worry I'm quite happy doing the clean and paint side of things😉 I'll definitely be doing the primary dampers, I'm a bit unsure what you mean by pin numbers?
Lower case has survived quite well I think. Maybe I'll call you this week at the times you said now that i know better the state of things.
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