honda305 Home honda305 Auctions honda305 Gallery honda305 Forum


honda305.com Forum

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

Very low compression, what to look for?

Post Reply
deafanddiabetic
honda305.com Member
Posts: 258
Joined: Thu Jun 19, 2014 6:04 pm
Location: Nebraska

Post by deafanddiabetic » Mon Sep 15, 2014 2:53 pm

Sorry about that G-Man, give this a try.

https://www.youtube.com/watch?v=8CVyf-t ... e=youtu.be

User avatar
G-Man
honda305.com Member
Posts: 5678
Joined: Wed Mar 25, 2009 5:17 pm
Location: Derby, UK
Contact:

Post by G-Man » Mon Sep 15, 2014 3:51 pm

Have you got the two o-rings on the two knock pins that go between barrel and head? They go on the two front corner studs.

G
'60 C77 '60 C72 '62 C72 Dream '63 CL72
'61 CB72 '64 CB77 '65 CB160
'66 Matchless 350 '67 CL77
'67 S90 '77 CB400F

Hoosier Tom
honda305.com Member
Posts: 817
Joined: Fri Aug 15, 2008 10:34 pm
Location: Logansport, IN

Post by Hoosier Tom » Mon Sep 15, 2014 3:58 pm

deafanddiabetic wrote: installed O-Rings on the two posts on the cylinder base
Need clarification on the statement above. The cylinder base is the bottom of the cylinder. The base gasket goes between the case and the bottom of the cylinder. If you truly put the o-rings here and not between the head and the cylinder top it will leak like a sieve.

HT

deafanddiabetic
honda305.com Member
Posts: 258
Joined: Thu Jun 19, 2014 6:04 pm
Location: Nebraska

Post by deafanddiabetic » Mon Sep 15, 2014 4:20 pm

Sorry about that guys, I put the O-Rings on those knock pins, I used the fiche to figure out where they went.

BUT, I did just find the source of the leak. It's coming from the bottom left corner of the camshaft cover. I put a new gasket on there, cleaned up the surfaces well and tried reputting in the 4 screws that hold it in place, but they're pretty stripped out. That's making it leak LESS, but I think I need to go buy some hex heds to really torque that sucker down.

This is where the leak was/is.
Attachments
$(KGrHqZHJCwE90r5SKoUBPp!MD(+cQ~~60_57.jpg
$(KGrHqZHJCwE90r5SKoUBPp!MD(+cQ~~60_57.jpg (8.65 KiB) Viewed 1437 times

Post Reply




 

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