Topic: CB500 head gasket o-ring leak

[rtbmrgl]

I started remove the cylinder head and replacing the gasket, o-ring, pucks and what other seals I find. Im also pulling the cylinder and replacing the base gasket. I engine only has 2k orig miles and the inside looks new but because of the age I'll go ahead and replace the stem seals and lap the valves. The engine is not smoking so not messing with the rings, unless i break one.
I plan on cleaning up the ports and if there is any little mod I should do to get a little more performance let me know. Nothing radical.
 I was thing about a Detroit 453 blower but it would get in the way of my headlight relay.

[dave500]

just knock off any obvious casting dags,you might want to check the manifold to head alignment,if its wonky youll want to fix it.

get a one mm drill bit and clean all the grunge out of the pistons oiling holes under the oil rings

[rtbmrgl]

just knock off any obvious casting dags,you might want to check the manifold to head alignment,if its wonky youll want to fix it.

get a one mm drill bit and clean all the grunge out of the pistons oiling holes under the oil rings

thanks for info Dave,
 I haven't pulled the head yet, but reading the Hondaman book the is a lot of cleaning inside the combustion chamber on the 750's. Ill give a look come Sunday when I get the head off.

[dave500]

don't touch the combustion chambers!where the oil gallery from the surface of the barrel to the head meets,on the head side I like to chamfer that passages entry hole.

[rtbmrgl]

don't touch the combustion chambers!where the oil gallery from the surface of the barrel to the head meets,on the head side I like to chamfer that passages entry hole.

10-4 commander, 

[rtbmrgl]

Here is a pic of the #4 cylinder, it looks worse than the photo. I ran fingernail and there were no grooves. The bike sat un-started since 1982 so above the rings moisture caused this. The other bores were fine so I decided to get a new set of rings, hone the cylinders and back together.
Im always open for ideas and suggestion, I have not looked into rings yet so I'm wondering if any particular type or brand are good choices.
Oh and cam chain tension and guide rubber are not hard but not as soft as the new one I installed on my 750. So I thought I should replace these now.

[rtbmrgl]

Removing valve keepers, Quick and easy.

https://www.youtube.com/watch?v=naMva7sjMFg&feature=youtu.be

[dave500]

that's all I do with rag in the combustion chamber,i don't let the keepers fly though I also have a rag over the socket to trap them then place them as I go into a magnetic dish.

[rtbmrgl]

that's all I do with rag in the combustion chamber,i don't let the keepers fly though I also have a rag over the socket to trap them then place them as I go into a magnetic dish.

Yeah that's a better idea,
 I didn't loose any of the keepers. I did put the head on a padded surface, don't want to accidentally bend the valves.

[rtbmrgl]

This happened today while painting, the cylinder head fell, only damage were dents in the fins and manifold. Im surprised the fins didn't break.
Found a set of manifold for $18.
It was one of those oh Sh*& moments, I'm sure the neighbors heard me.

[Stev-o]

Oh #$%*e.  I'd lightly file those fins to clean it up a little.

[dave500]

close call,my neighbours learnt a whole lotta new words thanks to me!

[rtbmrgl]

close call,my neighbours learnt a whole lotta new words thanks to me!

yeah like, darn, gee-wiz, and gosh. 

[rtbmrgl]

Hello, is there suppose to have copper sealing washers on the cam cover bolts. I didn't notice taking apart, paint was covering them. I found 4 copper washers.

[dave500]

the factory ones where aluminium,copper is fine,also on that little end cover bracket,one above the bolt head and below the bracket,make sure the bracket isn't burred,they are marked L and R.

[rtbmrgl]

the factory ones where aluminium,copper is fine,also on that little end cover bracket,one above the bolt head and below the bracket,make sure the bracket isn't burred,they are marked L and R.

Thanks for info, ok on the bracket.

[rtbmrgl]

Ok I got all the tools ready to put on the Pistons and install the cylinder



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[dave500]

you need a bigger hammer

[rtbmrgl]

Well Dave I did get a bigger hammer but didn't have to use it on the head, only on my head. I installed the cam chains guide


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[rtbmrgl]

Backwards. I did also discover ed it is real easy to get the cam gear off by one tooth. All ok now


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[strynboen]

vhen mount the cam thain tensioner at front side...take the bottom of the engine and thek (from dovn under)..not aussie land)..that the slider is korrekt.. in grove.as dave have shoven us many times ,how to do right..its just to easy to put it vrong inn..

[alacrity]

and make quadruple sure that tensioner is PERFECTLY seated down in the bottom of the case. There is a specific just sized right slot for it.  You can actually get it in there crooked, or partly in, etc and then with suprisingly little force the engine will go back together and you will feel like you did it all correctly. IF You have the barrels off, take the tensioner and just place it in where it goes.  Feel that little ..."snick" as it drops in at home there?  you gotta feel that later when you are buttoning it all up

[dave500]

this one had missed its little locating hole.

[alacrity]

yes. ALso, per Dave's photo, be sure to remove the #2 phillips before reassembly.
 

[rtbmrgl]

this one had missed its little locating hole.

Did you hear the engine run with the tensioner out of place. Curious what it sounded like. Also if it was running could the cam tesioner still be adjusted. Im always interested in diagnostics.