honda305 Home honda305 Auctions honda305 Gallery honda305 Forum


honda305.com Forum

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

Squish Question

oldbikedude
honda305.com Member
Posts: 91
Joined: Sun Nov 29, 2009 6:16 pm
Location: Pa.

Post by oldbikedude » Wed Jan 30, 2019 6:23 pm

Just remember, the deeper the valve head the higher the stem. This changes the rocker angle.
'67 Ca77 Dream

DJM
honda305.com Member
Posts: 553
Joined: Thu Oct 09, 2003 1:54 pm
Location: Chesterfield UK

CA valves

Post by DJM » Wed Jan 30, 2019 6:51 pm

Perhaps not if you're fitting the valves that were meant to be in there in the first place?

Dr. Frankenstein
honda305.com Member
Posts: 568
Joined: Tue Feb 02, 2010 7:11 pm
Location: Charlottesville, VA

Post by Dr. Frankenstein » Thu Jan 31, 2019 2:58 pm

Here's some pics, in any case:

This is a comparison of the valve faces - the Late on the left, the Early on the right:

ImageCA77 Valve Difference by Dr. Frankenstein1, on Flickr

Again, notice how big the Late is compared to the Early -
ImageIntake Valves by Dr. Frankenstein1, on Flickr
ImageValve Differences by Dr. Frankenstein1, on Flickr

Here's the divot I spoke about - my machinist says it's okay to use...
ImageSpare Head by Dr. Frankenstein1, on Flickr

The Early head, post grind...note the top/Intake ports ground at 45 and 30...kind of big there, huh...
ImageThe 'Spare' Head by Dr. Frankenstein1, on Flickr


...and the Late head, post grind:
ImageThe 'Original' Head by Dr. Frankenstein1, on Flickr



so whattya think...?

Dr. Frankenstein
honda305.com Member
Posts: 568
Joined: Tue Feb 02, 2010 7:11 pm
Location: Charlottesville, VA

Post by Dr. Frankenstein » Wed Feb 06, 2019 5:53 am

Umm - I think I know WHY one of my two heads has bigger valves...

As you know, I had the seats on these two heads re-ground and noticed one had bigger valves...they were both 305's (or so I thought) and so had them ground at 45 and 30...I got them home, lapped the valves and took them back in to have the vacuum checked - and that's when me and my mechanic Both noticed the Spare head had TWO carburetor ports on it! I CANNOT believe I /we did not even notice this detail before!

The Spare head in the pics is the one with the divotlike-thing taken out of the rocker arm channel, pictured directly above...look at the similarities…plus you can SEE the two ports in the very first picture! DOH!

I believe the Spare head is from a Superhawk, but are there any other 1960's Hondas that have dual carbs that this head might fit?


OR, could I mount this dual-carb setup to the regular 305 tranny...? THAT might be interesting, but I'd need a two-carb throttle linkage...

Geoff Hastings
honda305.com Member
Posts: 363
Joined: Wed Feb 22, 2017 2:59 pm
Location: Epsom, Surrey

Post by Geoff Hastings » Wed Feb 06, 2019 6:11 am

I'm sure we've all done it, been looking too deeply to see the obvious.
It does make me wonder though, how some of the damage we find in these strip downs occur. That chunk missing off your head for instance, I can't think of a reason that would ever have needed a wack hard enough to break that piece of casting.

Dr. Frankenstein
honda305.com Member
Posts: 568
Joined: Tue Feb 02, 2010 7:11 pm
Location: Charlottesville, VA

Post by Dr. Frankenstein » Wed Feb 06, 2019 6:25 am

I'm sure I don't know - my mechanic says it should be OK, though, because the arm isn't really affecting the integrity of that area when it's in; I just would like to know how that happened too!

What could have caused it...?? I don't know...

pemdoc65
honda305.com Member
Posts: 81
Joined: Wed Apr 29, 2015 6:28 pm
Location: Louisville, Kentucky

Post by pemdoc65 » Fri Feb 08, 2019 2:26 pm

Someone may have tried to drive a rocker shaft out with the head still on the engine and the cylinder stud in the way. And they missed with the punch.

Post Reply
cron




 

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