Exhaust stud

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Petrosexual
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Exhaust stud

Post 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....😂.

Thankyouverymuch.

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jt
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Re: Exhaust stud

Post 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
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Petrosexual
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Re: Exhaust stud

Post 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!

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Re: Exhaust stud

Post by wessi »

The thread size is 6 Millimeters, lenght of the bolt is 50 Millimeters

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shiskowd
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Re: Exhaust stud

Post by shiskowd »

Thread is M6x1.0 thread pitch, typical for all M6 fasteners on the CBX engine.
2022 KTM 890R, 1982 Pro-Link, 1979 CBX 'Z, 1975 Moto Guzzi 850T
Long Sleeping '79 CBX Restoration > viewtopic.php?f=102&t=11699

EMS
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Re: Exhaust stud

Post 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?

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Re: Exhaust stud

Post by Larry Zimmer »

Watch for porosity, too!
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Re: Exhaust stud

Post 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.

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Re: Exhaust stud

Post by Larry Zimmer »

Good stuff, Mike. Thanks from all.
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scottish CBX
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Re: Exhaust stud

Post 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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