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CB750K7 piston rings

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UKROBK7:
Mine has no wear ridge even after 35000 miles and ovality that's well within spec.  Must admit all the other aircooled engines that I have opened up have had the ridge but they weren't Honda, Honda are great!

Rob

david451:

--- Quote from: UKROBK7 on July 07, 2011, 09:11:26 AM ---Mine has no wear ridge even after 35000 miles and ovality that's well within spec.  Must admit all the other aircooled engines that I have opened up have had the ridge but they weren't Honda, Honda are great!

Rob

--- End quote ---

Only ever worked on two honda engines, my c50, first bike, bent a valve and set of piston rings, and my 250, rebore, camshaft and fingers, they were shit in the 70s. My mate had a 500 twin and even out the showroom it sounded like it was gona have a catastrophic engine and gearbox failure. It lasted a year and did in a gear and the camshaft, total shit, wasn't even nice to ride.

mick:
you won't be wantin one of those then will ya  :P

UK Pete:

--- Quote from: david451 on July 07, 2011, 12:42:44 AM ---
--- Quote from: UKROBK7 on July 01, 2011, 03:21:52 PM ---Just had the reply from D.S, it confirms what I thought! :-

The rings should be installed onto the piston thus;
 
The thick ring with the silver/grey edging and the "1N" marking goes on top. The "1N" mark faces upwards. As a general rule, any writing on rings always face upwards.
 
The thick black ring goes second.
 
The remaining 3 rings form the oil scraper which goes at the bottom, the  2 thin rings sandwich the serrated ring.

So away I go!!

Rob

--- End quote ---

Just remember that if there is a ridge on the top of the bore then standard rings can get broken if you don't hone it off, normally you would fit ridge dodgers, they have a recess cut out the top of the ring to miss the wear ridge. It will run but the first time you give it wellie the rings will break.

--- End quote ---



Never heard of ridge dodgers, infact that sounds more like an april fools joke LOL, if i had such a ridge at the top of my cylinders i would regard it as time for a rebore and next size piston and rings
Pete

steff750:
 ::) "ring dodgers "sounds like some bloke  who would never be seen dead in a gay bar  :-*
 seriously though Mr Honda started out making piston rings so i think he was pretty much clued up in that department ,so i would have too agree that Honda internals are better than anything else about at the time. i have never known Honda's too burn oil, except past the valve guide oil seals  ;)

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