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Exhaust stud
Posted: Mon Jan 30, 2023 8:34 pm
by Petrosexual
Can someone please tell me the thread size for the head end of a 1980 CBX1000A exhaust stud?.....
Oh, and the total stud length as current problem was caused by too short a stud....
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Thankyouverymuch.
Re: Exhaust stud
Posted: Mon Jan 30, 2023 9:55 pm
by jt
Using a online parts fiche can help.
https://www.partzilla.com/catalog/honda/motorcycle
79 - 6x50
STUD BOLT
92700-06050-0E
80-82- 6x55 ( Shows Unavailable in US) Maybe
https://www.cmsnl.com/ has them
BOLT, STUD (6X55)
92700-06055-0E
Re: Exhaust stud
Posted: Mon Jan 30, 2023 11:44 pm
by Petrosexual
Yes, oddly enough I know about those......pretty useless for me as THEY DONT STATE THE THREAD SIZE....which is what I need in order to helicoil the head!
Re: Exhaust stud
Posted: Tue Jan 31, 2023 2:57 am
by wessi
The thread size is 6 Millimeters, lenght of the bolt is 50 Millimeters
Re: Exhaust stud
Posted: Tue Jan 31, 2023 12:14 pm
by shiskowd
Thread is M6x1.0 thread pitch, typical for all M6 fasteners on the CBX engine.
Re: Exhaust stud
Posted: Tue Jan 31, 2023 3:28 pm
by EMS
Petrosexual wrote: ↑Mon Jan 30, 2023 11:44 pm
Yes, oddly enough I know about those......pretty useless for me as THEY DONT STATE THE THREAD SIZE....which is what I need in order to helicoil the head!
Be very careful when you drill for the helicoil insert. You are close to the exhaust port and there is a danger you run into it with the drill. Do you have the head off the motor?
Re: Exhaust stud
Posted: Tue Jan 31, 2023 9:49 pm
by Larry Zimmer
Watch for porosity, too!
Re: Exhaust stud
Posted: Wed Feb 01, 2023 8:13 am
by EMS
Here is a little tip: I used two exhaust flanges with the ribs machined off, mounted on top of each other on the exhaust port. Then using the empty hole as a guide for the drill. This makes sure you have the correct alignment. It is also good to mark the depth of the hole and mark the drill accordingly, so you know when you are in far enough.
Re: Exhaust stud
Posted: Wed Feb 01, 2023 10:38 am
by Larry Zimmer
Good stuff, Mike. Thanks from all.
Re: Exhaust stud
Posted: Sun Mar 26, 2023 7:49 am
by scottish CBX
It is worth checking to see if the old exhaust copper crush gaskets are still in the head. When I changed my exhaust over I noticed there were two old gaskets in the exhaust port hence that would push the collar our further possibly meaning the stud appears to be short of length. Just a thought.
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