Piston Rings

[Bryanj]

Ken, if yours is a later 500 the 550 cylinders may go straight on, or cheat and bore the 500 to 550 pistons

[AshimotoK0]

I’ll take them Ash if that’s ok, just add them to the cover for when I pop over. Not knowing what state my barrel liners are after 30 years I was thinking it may finally need a rebore, either that or fit some 550 barrels but that involves widening the crankcase opening IIRC

Yea that's fine Ken.....I ended the listing.

I also checked out some 3-piece oil ring ---383--- rings and apart from a later style of spring/separator ring as on the CX500 .. they are the same as 500's. They fit the 330 pistons which also fit a 500/4


https://www.ebay.co.uk/itm/143570835008?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649


My friend also has these on eBay.


https://www.ebay.co.uk/itm/Honda-CB500-4-NOS-piston-rings-13021-323-013-first-oversize/153864850256

[Trigger]

Ken, if yours is a later 500 the 550 cylinders may go straight on, or cheat and bore the 500 to 550 pistons

By the time you have gone to all that trouble, you may as well put a 550 engine in, if the bike is that far away from std   

[Bryanj]

Its the 605(592) that standard 500 liners wont do Ken, 61mm nominaly

[AshimotoK0]

I don't like the 550 engine in a 500 frame Graham. The bigger clutch housing interfered with the rear brake lever, tried it before, didn't like it so went back to the 500. It's far away from standard yes but it's all that era Honda parts, I just prefer to upgrade the stuff Honda should have got right in the beginning 

Always thought the 500 liners wouldn't bore out to a 550 piston Bryan. Well not safely anyway. My engine number begins 20249** not exactly sure how that sits in the engine number range.

Not sure if first over will be enough Ash, most likely would be before buying I'd prefer to see and check first, at 3rd over your pretty safe it will clear at that.

Yes agreed .. I just got away with +0.25

[Trigger]

I don't like the 550 engine in a 500 frame Graham. The bigger clutch housing interfered with the rear brake lever, tried it before, didn't like it so went back to the 500. It's far away from standard yes but it's all that era Honda parts, I just prefer to upgrade the stuff Honda should have got right in the beginning 

Always thought the 500 liners wouldn't bore out to a 550 piston Bryan. Well not safely anyway. My engine number begins 20249** not exactly sure how that sits in the engine number range.

Not sure if first over will be enough Ash, most likely would be before buying I'd prefer to see and check first, at 3rd over your pretty safe it will clear at that.

I can't see that. I have a 550 motor in a 500 frame and there is no interference of the brake pedal. The 550K0, K1 and K2 had the 500 frame and brake set up 

[Bryanj]

But did you get regrade quality Dunlop ribbed Trigger?

[Bryanj]

I think Honda changed the size of the hole in the cases of the 500 during the production run somewhere, i remember having an early 500 and the 550 cylinders wouldnt fit but the 605 liners i have will go in the new cases i have.
Somewhere i have a plastic crate with lots of pistons in and one set was sold as 12th o/s 500 (59mm) only problem is the liner taper is mostly gone then so you need removable ring compressors, but then if i can get my hands in to do a wing i can do that!!