Question for the engineers out there.

[border0_3]

Please gents - correct if wrong.

In the Honda part number-

Thick rings
-266- 305 engine
-259- 250 engine

Thin rings
-275- 305 engine
-268- 250 engine

Cheers

[Geoff Hastings]

Not sure what I got then, the number on the box is C771364, they were sold to me as standard size C77 rings. Thanks for your input Richard. And, congratulations to Australia for winning the ISDE both men and ladies again.

[Tim Allman]

Not sure what I got then, the number on the box is C771364, they were sold to me as standard size C77 rings. Thanks for your input Richard. And, congratulations to Australia for winning the ISDE both men and ladies again.

ISDE???

They're quite likely what you want. Honda changed its part numbering system in the early 60s and there are still lots of piston rings with the old number.

Have a look here: https://www.ebay.com/itm/NOS-Honda-Stan ... 2328477060

[LOUD MOUSE]

ISDE International Six Day Enduro
A European form of trials and cross country racing competed by teams from many nations/countries.
TOUGH for sure. ...............lm

Not sure what I got then, the number on the box is C771364, they were sold to me as standard size C77 rings. Thanks for your input Richard. And, congratulations to Australia for winning the ISDE both men and ladies again.

ISDE???

They're quite likely what you want. Honda changed its part numbering system in the early 60s and there are still lots of piston rings with the old number.

Have a look here: https://www.ebay.com/itm/NOS-Honda-Stan ... 2328477060

[Geoff Hastings]

ISDE, INTERNATIONAL SIX DAY ENDURO, held in a different country each year. Super tough event and Australia won it last year also.
Nothing to do with vintage Japanese motorcycles but of note for anyone who rides on the dirt.

Anyway, back to business. I recently rebuilt a blown up, big time, 250 Suzuki using Chinese manufactured parts. Now I know it's the thing to knock anything Chinese built like we did with Japanese goods years ago but, Apple, Sony and many other "Quality" manufacturers use Chinese factories to produce their goods.
For the Suzuki, big end and conrod £30, Piston, rings and pin £35. 4 valves £20. Using genuine parts the engine was a write off, but, how well it will last only time will tell but currently running sweet. With this in mind I decided to see if there were any Pistons that might be suitable for my CA77. It didn't take long on AliExpress searching for 60mm Pistons to find a new piston with rings and pin for £11 with free postage, all the dimentions were identical except the piston crown is a couple of mil lower at the point than the Honda one. For that money it is worth a look so I've ordered a couple and will keep you posted what actually arrives in the post.
Thanks for your link Tim but these are the same rings I already have, ie the thick ones.

[LOUD MOUSE]

They became the 266 issue. ............lm

Not sure what I got then, the number on the box is C771364, they were sold to me as standard size C77 rings. Thanks for your input Richard. And, congratulations to Australia for winning the ISDE both men and ladies again.

[mike1969]

bump