76-79 crankshaft differences?

Discuss everything about Honda GoldWing. Feel free to ask any question related to GoldWing.

Moderators: CYBORG, Oldewing, robin1731, Forum Moderators

Post Reply
Gc33
Chrome Member
Chrome Member
Posts: 181
Joined: Thu Sep 26, 2019 9:06 am
Location: Perth Western Australia

76-79 crankshaft differences?

#1

Post by Gc33 »

G'day gents... I'm looking at picking up a replacement crankshaft for my 75 project. Mine is badly scored on what appears to be 1 and 3 cylinders. Engineering company has said they can machine it but depending on thickness of bearings avail. The guy I dealt with is motorcycle nut and is well aware of bearing coding... Yahoo.
I've found a number of cranks on evil Bay... From 75 to 79.
What I want to know is... Is there a difference between the years... Ie 76-77-79. Because of the kick start mechanism on 75-76 I was wondering if it was any different.
Every journal has markings but these 2 were the worst.
Attachments
20210302_153718.jpg
20210302_153718.jpg (171.51 KiB) Viewed 247 times
20210302_153623.jpg
20210302_153623.jpg (163.62 KiB) Viewed 247 times
User avatar
Whiskerfish
President
President
Posts: 36852
Joined: Thu Feb 16, 2006 9:34 pm
My Album: http://www.ngwclub.com/gallery/v/wingmans/whiskerfish/
Location: Norfolk Va

Re: 76-79 crankshaft differences?

#2

Post by Whiskerfish »

Off hand the only significant difference I know of is the timing marks changed. Early (75-77) 1000's are marked at the 5 degree baseline and later (78-79) are a 10 degree base. It was part of the 78 retune. Base Timing, advance curve, carbs, valve lift/duration, and exhaust all changed. some info here https://ngwclub.com/forum/viewtopic.php ... 58#p155838
"Agreement is not a requirement for Respect" CDR Michael Smith USN (Ret) 2017
"The book is wrong, this whole Conclusion is Fallacious" River Tam
2008 GL1800 IIIA "TH3DOG"
1975/6/7/8/9 Arthur Fulmer Dressed Road bike
1975 Naked Noisy and Nasty in town bike
and a whole garage full of possibilities!!

Psst. oh and by the way CHANGE YOUR BELTS!!!!
Shadowjack
Silver Member
Silver Member
Posts: 654
Joined: Fri May 26, 2017 11:07 am

Re: 76-79 crankshaft differences?

#3

Post by Shadowjack »

The various bearing sizes originally available from Honda were only to obtain a precision factory fit. If the journals are ground undersize, there are no factory shells that would fill the gap, even if all the originals were still available. So yes, you need a crank.
ms03
Titanium Member
Titanium Member
Posts: 428
Joined: Tue Feb 16, 2010 4:36 pm
Location: Southfield Michigan

Re: 76-79 crankshaft differences?

#4

Post by ms03 »

That is what I did with my 77 it came with a spun connecting rod bearing on the 1 cylinder along with a bent valve.

I got the entire crankshaft with pistons from a 1978 and ordered new main bearings the kick start part was easy.
Resurrecting a 1977 GL1000 with 7,380 miles
Gc33
Chrome Member
Chrome Member
Posts: 181
Joined: Thu Sep 26, 2019 9:06 am
Location: Perth Western Australia

Re: 76-79 crankshaft differences?

#5

Post by Gc33 »

Thanks gents. I thought there were differences but wasn't sure exactly what. I wasn't aware of the timing. So definitely on the lookout for a good 75-76 crank... Few on evilbay...
I think I'm going to have to split my spare parts motor. It's high km so no guarantee that the crank will be any good in it but only one way to find out I guess..
redglbx
Gold Member
Gold Member
Posts: 1116
Joined: Tue Jun 02, 2020 8:39 am
Location: NW Indiana,

Re: 76-79 crankshaft differences?

#6

Post by redglbx »

75-77 should all be the same but as said above the 78-78 have different timing marks due to different compression ratio & cams. If you find a good 78-79 you can use a degree wheel & remark It to 75-77 specs. This is how I found my F2/t2 timing marks were 6deg off from the factory & remarked them. Not hard to do at all.
Red 1976 oe owner
1976 LTD restored
1980 CBX , in the que, to fix the ignorant heavy handed owner
1981 CBX
1977 CB750 K7
2014 FJR OE owner, sold
1980 GL1100
1984 GL1200 naked
1969 CL350, in the que
Gc33
Chrome Member
Chrome Member
Posts: 181
Joined: Thu Sep 26, 2019 9:06 am
Location: Perth Western Australia

Re: 76-79 crankshaft differences?

#7

Post by Gc33 »

Well thankfully... Today I bit the bullet and started splitting the second engine I had. It was pretty rough on outside but turned out to be a rough diamond. Bores are all original and crank and bearings on inspection one by one... I couldn't ask for better.
Happy days... So happy I could cry...
User avatar
Sidecar Bob
Honored Life Member
Honored Life Member
Posts: 7633
Joined: Sun Jun 11, 2006 10:14 pm
Location: Kawartha Lakes, Ontario

Re: 76-79 crankshaft differences?

#8

Post by Sidecar Bob »

FWIW, I put the kickstart from a '77 engine on a '79 engine. The part that engages with it attaches to the end of the crankshaft. I can't say if there are any differences other than that, though.
Mr. Honda ('83 GL1100/Dnepr) summer How a motorcycle evolves thread
The Famous Eccles ('84 CX650EI/VeloUral) winter Never Ending Build (CX500forum)
Click: Colour schematics for all GL1000 & GL1100 and GL1200 standard models plus instructions on how to download the full size version
"A guy with two sidecars can't be all bad." - Cookie
Another guy with two sidecars..... Hmmmm... must be something to that....
Post Reply
  • Similar Topics
    Replies
    Views
    Last post

Return to “GoldWing Tech Discussions”