| Author | Message | ||
     Griffmeister |
Anybody know if the exhaust studs are a common size and what is it? Discovered a broken stud on the rear head today and need to fix it pronto. If dealer doesn't have it I'd like to find one locally. Hoping it's something they might have at NAPA or Autozone. Thanks. | ||
| Garrcano |
They have different threads on each end: 5/16"-24 for the nut 5/16"-18 for the cylinder Length is 43 mm (1-11/16" ????????) | ||
| Natexlh1000 |
The dealer should have a bucket of them as the HD bikes use the same things. I don't think there is anything exotic about them though. The nuts are available from autoparts stores. (Message edited by natexlh1000 on May 15, 2013) | ||
| Orangeulius |
You can also get them from Al at American Sport Bike. | ||
| Griffmeister |
Guess what? Picked some up at the dealer today, they are exotic. The end that goes in the head is 5/16-18, pretty common. The end with the nut is 8mm-1.00. That's a super fine thread as an 8mm bolt is normally 1.25. You're also mixing SAE and metric.Don't know why you just couldn't stay with 5/16 on both ends. Might have to since the dealer only had two nuts, no pun intended. Will worry about that later, still trying to get the broken stud out and my drilled hole is off center already. No room to get straight on.  | ||
| Reepicheep |
Ebay has drill guides for under $50. I got one just to be ready. Having an already off center hole will make it hard (maybe impossible?). Tungsten carbide bullet shaped dremel bits will take that old stud out like butter. It will take tedious time and patience in awkward positions, but you can carve most of the old stud out with minimal damage, then drill it for a heli-coil or timsert. | ||
| Griffmeister |
Hey Reep, guess what I've been doing for most of the night? Picked up a couple of 1/8 inch shaft carbides and have been merrily gouging away at that stud. Could not at any point get the rest of the stud out, had to drill out completely. Bolted both header flanges together on the remaining stud as a guide and drilled out the hole for a Helicoil. It just so happens that the flanges are the perfect size for the Helicoil drill bit. Got the header mounted up nice and tight. Waiting for daylight before rotating the engine back up. Don't need to pinch or break anything at this point. | ||
| Natexlh1000 |
Metric? Are you sure? | ||
| Reepicheep |
 Now you can spend the next month getting those little razor sharp shards of old exhaust stud out of your palms. Try it with a broken tap sometime... it's even worse if you can believe such a thing could be possible. DAMHIK.  | ||
| Griffmeister |
Positive, Nate, the bag that the nuts came in say right on the label 8M-1.0 and a 1.0 thread gauge is the only one that fits. Reep, been there done that. If you're lucky you can take a punch and break up the rest of the tap. Sometimes not. (Message edited by Griffmeister on May 20, 2013) | ||
| Zac4mac |
We have a jig from Jim's that guides the drill bit to eat only the studs. Makes broken stud extraction a little less a PITA. Z |
