650C stripped exhaust studs

A

akasoldats

New Member
So, I have a two part question. Does anyone know where I can find a set of new exhaust studs for a 1980 CB 650 C? I've checked all of the local hardware shops, automotive, etc sadly to no avail.

The second part being, is there any decent way to rethread the ports that were stripped? I've tried helicoil before but I don't think that is a great solution. One of the POs must have had the pipes on and off of the bike quite a bit because just about all of the threads are chewed up in one way or another. Either the studs themselves or the actual ports they screw into. I'm thinking about replacing the head but that may be more work / money than it is worth. Any ideas?

Thanks!
 
Is this what you are looking for: http://www.ebay.com/itm/Honda-CB650-and-CB650C-79-82-Stainless-Exhaust-Stud-Set-/331614749113?hash=item4d35c781b9:g:U3YAAOxyOlhSxu~I&vxp=mtr

OEM: BOLT, STUD (6X51) PN: 90044-426-300

As for the second question, heli-coils work fine. You could also drill and tap to a larger stud, maybe one more locally available to you. Just make sure the stud fits the exhaust flange.
 
Helicoil the head and loctite the studs in. Then you just undo the nuts off the stud to remove the exhaust.


Those studs are just M8 - surprised you cant find something at an auto store??
 
Heli coils suck. Look into one of the solid insert kits available. No time for suggestions but google timesert

If you go with another head dont just scrap that one please thank you
 
Timesert. Much better than helicoil and very confidence inspiring. Helicoils are fine, but I think a bit tricky to get just right. I use Timeserts (there are other similar systems) in brand new fabrications when the capacity of the parent material is too weak to support the desired threaded component. The much larger bearing surface of the insert makes possible fastenings that would fail otherwise. Not simply an excellent repair, but can be a substantial improvement over the original.
 
jpmobius said:
Helicoils are fine, but I think a bit tricky to get just right.
Click to expand...


You are right - most of the issues with helicoils stripping are when it isn't insert deep enough and there's some thread hanging out of the hole. Timeserts are better as far as ease of insertion / application goes.


You still want to loctite the stud in and just use the nuts regardless of which one you use IMO.
 
heli coils suck they strip break and unthread all the time it's an outdated product. timeserts are better in every way.
 
Thanks everyone for the words of wisdom. I was hoping there would be something a little more local, alzcbz, but I guess not. Surprisingly that isn't the first supplier in GB I've come across. I actually ordered studs that are larger but they don't clear the flanges on my exhaust..

I'll grab some timeserts and give em a go. Thanks again!
 
DohcBikes said:
heli coils suck they strip break and unthread all the time it's an outdated product. timeserts are better in every way.
Click to expand...


Helicoils are fine if you put them in properly.


But I do agree - Timeserts are almost impossible to fuck up.
 
hillsy said:
I do agree - Timeserts are almost impossible to fuck up.
Click to expand...
Nobody said that, and this false statement lets me know without a doubt that you have never, ever used a timesert. It's actually quite easy for a novice to make a mistake when installing a timesert, and I recommend that you, along with any other first time user, to do some research before acting like you know what you are doing. I was taught by a very talented instructor how to use them.
 
DohcBikes said:
Nobody said that, and this false statement lets me know without a doubt that you have never, ever used a timesert. It's actually quite easy for a novice to make a mistake when installing a timesert, and I recommend that you, along with any other first time user, to do some research before acting like you know what you are doing. I was taught by a very talented instructor how to use them.
Click to expand...


I have used Timeserts - but I still have a box of a gazillion Helicoils so I use them in most cases.


My statements still stands - compared to Helicoils, Timeserts are almost impossible to fuck up.
 
hillsy said:
But I do agree - Timeserts are almost impossible to fuck up.
Click to expand...
hillsy said:
My statements still stands - compared to Helicoils, Timeserts are almost impossible to fuck up.
Click to expand...
Your statement still what say ya? Looks to me like it didn't stand alone.

DohcBikes said:
timeserts are better in every way.
Click to expand...

Yes, again, compared to helicoils, timeserts are superior in every way.
 
There are also Keyserts. I never thought Timeserts were that hard to install. Timesert even promotes them by their ease of installation. They also sell kits for repair from helicoil failure. The machine shop that rebuilt my CB750 head used Timeserts to repair an exhaust header stud. It's the way to go. Helicoils are springs. I have a hard time trusting that design in a head.
 
Big-Serts are nice if the hole has been screwed up from a previous coil repair. I installed hundreds of helicoils that have worked fine. Many, many Time-Serts too.Many different lengths with the Time Sert compared to Helicoils....they come in stainless too. I get the Time-Serts from these fella's
https://www.belmetric.com/timesert-thread-repair-%C3%82%C2%AE-c-217.html
 
My local honda dealer had some as mine sheared right off when removing the nuts. The ones they had were 6x50 so 1mm shorter but they worked perfectly.
 
Nice! Following that up, anyone have any advice on drilling out a bolt extractor? It snapped off in the hole for my seat mounts. I'm guessing its hardness is going greater than that of most drill bits out there :/
 
wow how did you do that! You should be able to use a nice sharp bit, but it'll likely dull in the process. Make sure to use heat and penetrating lube on removal.
 
Bolt extractors are often brittle (well, the cheaper ones are) and any lateral movement whilst turning can easily snap them off. If it's close to the surface or a bit sticking out you can place a nut over it and weld onto the offending stub. Then unbolt it. The heat from the welding helps remove stuck bolts as well.
 
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