honda305 Home honda305 Auctions honda305 Gallery honda305 Forum


honda305.com Forum

Login
□ Search
□ FAQ 
□ 
Vintage Honda Owners,
Restorers, Riders and
Admirers

A strange one

Points Based Ignition | Electronic Ignition Upgrade
Merz64cb77
honda305.com Member
Posts: 154
Joined: Mon May 08, 2017 7:42 pm
Location: Mississauga, ON CAN

A strange one

Post by Merz64cb77 » Sat Jul 21, 2018 7:35 am

I’m no expert but I think it’s an electrical issue of some kind. Could it be a grounding issue?

Are you running NGK D10HS plugs?
67' CB77
66’ CB77
65’ bomber
68’ hellcat

User avatar
malcolmgb
honda305.com Member
Posts: 401
Joined: Mon Nov 07, 2011 11:52 am
Location: Midlands UK & Cleveland OH

Post by malcolmgb » Sat Jul 21, 2018 4:08 pm

1977 CB400F
1973 CL175
1976 XL175 - Sold
1964 CL72
1966 CA78

mike in idaho
honda305.com Member
Posts: 411
Joined: Sun Jan 29, 2012 9:18 pm
Location: orofino, idaho

Post by mike in idaho » Sat Jul 21, 2018 4:57 pm

You may still have a fuel/air issue. It should be harder to start without the choke. Is the air filter new? Have you tried running it without the air filter?
'65 YG1
'65 CB160
'66 CL160
'66 CL77
'78 XS650
'79 GL1000
'69 T100R
'68 TR6
'69 T120
'72 750 Commando
my company car is a Kenworth

PF1
honda305.com Member
Posts: 7
Joined: Thu Jul 21, 2011 10:51 am
Location: Portsmouth UK

Post by PF1 » Sun Jul 22, 2018 4:23 pm

When I was a young chap my C72 had this problem after reassembly, the cam was one tooth out.
Kept fouling plugs tag lag. I was sure I had assembled it correctly too doh!

modelman
honda305.com Member
Posts: 222
Joined: Wed Jun 24, 2015 2:27 am
Location: Yorkshire, UK
Contact:

Post by modelman » Sun Jul 29, 2018 1:56 am

PF1 wrote:When I was a young chap my C72 had this problem after reassembly, the cam was one tooth out.
Kept fouling plugs tag lag. I was sure I had assembled it correctly too doh!
I hear what you're saying & I did think you could be right, but thinking about it, since the points-cam is on the camshaft, one tooth out would make the lobe around 10 or so degrees out & my points & backplate are in the exact position, & i'm sure the timing is spot-on as it was timed using the test-lamp.
Put in a pair of new iridium plugs & it ran great!!

'Correct' plugs in & no-go, so I bought a plug-tester the other day & found that over half of the many plugs I have are dud, took the 2 'new' ones I bought for the 77 back to the shop & they replaced them, the bike runs well now with the correct plugs.
I remember just how quiet these were in the day, mine is a bit noisy at the top-end, the gaps are correct & there was no evidence of wear, but I did use the old chain & tension-wheel,
so maybe that's the reason.
GSX1400 Red/silver
GSX1400 Blue
GS1000G
Brockhouse Corgi
CB77
CA77
T140
BSA 250

I DO have to grow old, I DO NOT have to grow up.

Post Reply




 

CB-77 | CYP-77 | Road Test | Riding Log | Literature | Zen | Marketplace | VJ Survey | Links | Home