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cleg
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Joined: Sat Aug 13, 2011 2:01 pm
Location: St Louis, MO

Thread size

Post by cleg » Sat Dec 20, 2014 2:45 pm

Are the threads on the Superhawk left side crankshaft size 20x1.5 ? I bought a crank and the threads are messed up. I can't get the nut to thread on.
'66 CB77 '75 Rd125

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G-Man
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Post by G-Man » Sat Dec 20, 2014 3:30 pm

Hi

I don't have one nearby to measure but you could check the pitch against a regular M10 bolt which is 1.5mm pitch. Honda use M10 fine normally do you need a regular M10 from a hardware store.

I'll measure one for you tomorrow if that helps.

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

LOUD MOUSE
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Post by LOUD MOUSE » Sat Dec 20, 2014 4:09 pm

He stated NUT not Bolt.
Ya may want to file off the bad threads until you can get the nut to start. ..........lm
G-Man wrote:Hi

I don't have one nearby to measure but you could check the pitch against a regular M10 bolt which is 1.5mm pitch. Honda use M10 fine normally do you need a regular M10 from a hardware store.

I'll measure one for you tomorrow if that helps.

G

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G-Man
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Post by G-Man » Sat Dec 20, 2014 4:20 pm

LM

You misunderstood me. I was just suggesting that he use an M10 bolt as a thread gauge to check that the pitch was 1.5mm.

He should be able to tidy up the thread with a needle file if it's not too bad.

The question was about what size the thread was on the crank.......

G

LOUD MOUSE wrote:He stated NUT not Bolt.
Ya may want to file off the bad threads until you can get the nut to start. ..........lm
G-Man wrote:Hi

I don't have one nearby to measure but you could check the pitch against a regular M10 bolt which is 1.5mm pitch. Honda use M10 fine normally do you need a regular M10 from a hardware store.

I'll measure one for you tomorrow if that helps.

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

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G-Man
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Posts: 5681
Joined: Wed Mar 25, 2009 5:17 pm
Location: Derby, UK
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Post by G-Man » Sat Dec 20, 2014 4:25 pm

One of the could be handy for tidying up the crank end if it's not too bad.

http://www.ebay.com/itm/Thread-Restorer ... 4d2a389ba0

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

LOUD MOUSE
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Posts: 7818
Joined: Mon Aug 15, 2005 8:23 am
Location: KERRVILLE, TEXAS

Post by LOUD MOUSE » Sat Dec 20, 2014 4:43 pm

It is a 1 pitch which is visible by eye to a 1.25 or 1.50.
We both recommended he file the shaft as to purchase a die for a one time use is expensive. ............lm ......................lm
G-Man wrote:LM

You misunderstood me. I was just suggesting that he use an M10 bolt as a thread gauge to check that the pitch was 1.5mm.

He should be able to tidy up the thread with a needle file if it's not too bad.

The question was about what size the thread was on the crank.......

G

LOUD MOUSE wrote:He stated NUT not Bolt.
Ya may want to file off the bad threads until you can get the nut to start. ..........lm
G-Man wrote:Hi

I don't have one nearby to measure but you could check the pitch against a regular M10 bolt which is 1.5mm pitch. Honda use M10 fine normally do you need a regular M10 from a hardware store.

I'll measure one for you tomorrow if that helps.

G

cleg
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Posts: 84
Joined: Sat Aug 13, 2011 2:01 pm
Location: St Louis, MO

Post by cleg » Sun Dec 21, 2014 12:20 pm

Thanks guys. I ended up using a die grinder to get to some decent threads.
I have the left side together (a peek at LM's nice clutch). Does the stack on the crank look correct, before I tighten the nut with a spanner?
I've also attached a pic of my rebored and copper lined sleeves cylinder.
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image.jpg (119.86 KiB) Viewed 4930 times
'66 CB77 '75 Rd125

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