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anyone have any info about the dowl seal that goes between the head and cylinder of a 1972 CB350? since finishing my VN750 bobber ive been working on a CB350 cafe racer. the dowl seal are a giant mystery tho, manual says they r required but no part diagrams show them and i dont remember seeing any when i disassembled it.
 

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anyone have any info about the dowl seal that goes between the head and cylinder of a 1972 CB350? since finishing my VN750 bobber ive been working on a CB350 cafe racer. the dowl seal are a giant mystery tho, manual says they r required but no part diagrams show them and i dont remember seeing any when i disassembled it.
What manual are you using, and what page is it on? Reason I ask, I've got a factory manual in front of me right now, and I don't see any mention of a dowel seal, unless I'm looking in the wrong place.

I've got a '70 CL350, and a '73 CB350, mine and my brother's first bikes from way back when; both mine now, and both awaiting restoration---or a two-into-one mini metric chopper build...

Jim
 

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Clymer manual pg.72 under "caution"
mine is a 72'

DONT chopper or bob a CB350!!! its not the right geometry. Its a 100% cafe bike! they r gettin expensive. If they r in good shape u can prob easily pull $1500 for both or more. Then buy an yamaha XS650 to chop or bob.
 

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Clymer manual pg.72 under "caution"
mine is a 72'
Thanks; I'll check it out when I get around to looking for where I stuck my Clymer's for those bikes...

DONT chopper or bob a CB350!!! its not the right geometry. Its a 100% cafe bike! they r gettin expensive. If they r in good shape u can prob easily pull $1500 for both or more. Then buy an yamaha XS650 to chop or bob.
They're both locked up basket cases, and excuse me, but they're also 100% mine; I'll damn well do what I want with them when I do decide.
 

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I had a neighbor with a couple '74 CB360 that we fiddled with some years ago. Believe the dowel seal may simple be an O-ring that goes around the indexing pins or "dowels" sealing up the joint between the two for oil passage.

My TW200 has the same arrangement, for whatever that's worth.
 

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Discussion Starter #6
I had a neighbor with a couple '74 CB360 that we fiddled with some years ago. Believe the dowel seal may simple be an O-ring that goes around the indexing pins or "dowels" sealing up the joint between the two for oil passage.

My TW200 has the same arrangement, for whatever that's worth.
I understand the idea of it but the rebuild kit didnt come with anything that looks like it would fit and i dont remember seeing any seals when i took it apart. The rebuild kit also came with valve stem seal but turns out the early CBs didnt use valve stem seals, u can see where the confusion is building.
 

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I had a neighbor with a couple '74 CB360 that we fiddled with some years ago. Believe the dowel seal may simple be an O-ring that goes around the indexing pins or "dowels" sealing up the joint between the two for oil passage.

My TW200 has the same arrangement, for whatever that's worth.
That could well be. I don't recall them on the last CB350 I had apart, but that was 30+ years ago. IIRC, that manual covers the 250 and 350 twins; the seal(s) _might_ be specific to one, and not the other. Also, if they do require a seal/o-ring, I'd think there would be a groove or recess around the dowel for it to seat in. Dunno without taking one apart again, and it'll be quite a while before I get around to working on mine.
 

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Discussion Starter #8
That could well be. I don't recall them on the last CB350 I had apart, but that was 30+ years ago. IIRC, that manual covers the 250 and 350 twins; the seal(s) _might_ be specific to one, and not the other. Also, if they do require a seal/o-ring, I'd think there would be a groove or recess around the dowel for it to seat in. Dunno without taking one apart again, and it'll be quite a while before I get around to working on mine.
there is no recess for a seal to sit down into, and the hole in the head gasket for the dowel is just big enough for the dowel to fit through. Is seems that if any seal was put on there then it would sit on top of the gasket and cause a gap between the head and the cylinder. even if the gasket hole was larger, the seal would have to be about the same thickness as the head gasket so everything would sit flush. I dont see why the head gasket wouldnt seal the dowel... it goes all the way around it.
 

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there is no recess for a seal to sit down into, and the hole in the head gasket for the dowel is just big enough for the dowel to fit through. Is seems that if any seal was put on there then it would sit on top of the gasket and cause a gap between the head and the cylinder. even if the gasket hole was larger, the seal would have to be about the same thickness as the head gasket so everything would sit flush. I dont see why the head gasket wouldnt seal the dowel... it goes all the way around it.
I wouldn't worry about it, then. FWIW, I've seen quite a bit in other than factory manuals for motorcycles, especially Haynes, that has had me scratching my head for awhile wondering what the heck they're talking about. Hasn't happened with Clymer's as often, but it has happened.

Lemme know if you want a copy of the Honda manual; I've got it in *.pdf. I've got two of the Clymer manuals in hardcopy, and can't find either one right now; go figger...
 

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Discussion Starter #10
im just gonna put some super tack around the area and if it leaks then ill have to keep researching. That cam is a pain to remove tho so id rather not have to take it out again
 
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