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by raithe
Thu Jul 18, 2013 6:39 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: Odd top end noise
Replies: 8
Views: 3717

it occurs once for each valve closure, you can feel it on each valve also both intakes, both exhausts. Yes, cam pointer jumps forward a hair when it clicks. EDIT: interesting. I just tried adjusting the chain, slacked the nut and backed out the bolt, rotated motor and the shaft doesn't move at all. ...
by raithe
Wed Jul 17, 2013 7:50 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: Odd top end noise
Replies: 8
Views: 3717

Interesting, though his showed the noise when the valves reached the max opening and this is as they close, still worth checking when I pull the head.
by raithe
Wed Jul 17, 2013 4:56 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: Odd top end noise
Replies: 8
Views: 3717

I think I saw that, about the neoprene bits on the advance unit. A bit more investigation with a stethoscope shows it is definitely the valves, each one shuts with an audible "click". You can feel it if you place your finger on the rocker. I presume these valve systems run quiet normally? (I have li...
by raithe
Tue Jul 16, 2013 7:26 pm
Forum: Motors - 247cc | 305cc | 337cc | 350cc
Topic: Odd top end noise
Replies: 8
Views: 3717

Odd top end noise

So I found a donor 67 CB77 to complete my 64 with. The motor seems to be in good shape, but when rolling it slow by hand to check valve gap and timing I noticed something strange. As the advance marks (double slash) passes the pointer there is an audible "click". If I touch the exhaust rocker I can ...
by raithe
Tue Jun 18, 2013 5:25 am
Forum: Wanted - Parts | Bikes | Services
Topic: Need a few CB77 bits
Replies: 0
Views: 875

Need a few CB77 bits

I could use some bits for a superhawk I picked up recently. Don't have to be shiny(prefer not actually), just functional. This is going to be a daily rider not a show bike. Need a set of rings jugs and pistons, a cam chain, carbs, handlebars, headlight ring, Levers perches and cables. and some other...




 

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