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Old 20th October 2020
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Default Thread pitch for 91 front engine mount bolts.

Does anyone know what thread pitch is used for the front engine mount bolts?

Oops, it's a 2001, not a 91.

I helped a neighbor do some work on his 2001, and the bolts in there were 3/8-24. Both were falling out and there was no nut on the lower one. The upper bolt is blind on the right side of bike, so the bracket is threaded. The 3/8-24 does not thread into that bracket, so we just put a new nut on the lower bolt and tightened all the bolts involved but had to leave the top bolt out so he could ride home.

Looking at the bracket with a flashlight it looked like coarse thread so I am wondering if someone has replaced them with 24 pitch instead of 16? I don't want to try to chase the threads until I am sure that it is really supposed to be 24.

These are the two bolts that go through the case if the engine I am asking about.

Thank you for any info you may have here.
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Old 20th October 2020
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Both rear (top/bottom) bolts are suppose to be (4413) 3/8"x24x5-1/2 hex grade 5.
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Old 21st October 2020
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Quote:
Originally Posted by Hippysmack View Post
Both rear (top/bottom) bolts are suppose to be (4413) 3/8"x24x5-1/2 hex grade 5.
Yep - Rear two holes of the Left Front (Lower) Motor Mount - Item#9 (x2) on the Parts Diagram is 3/8"-24

The bolt for the bottom-most Rear hole goes thru the Right Front (Lower) Motor Mount and uses Item#20 (P/N 7780), a 3/8"-24 Flange Nut.

The bolt for the top-most Rear hole of the Right Front (Lower) Motor Mount is threaded directly into the motor mount. That should be 3/8"-24 as well. I would surmise that if you had to, you could put a thin nut on the outside of the motor mount if you got a 1/4" longer bolt.

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Old 21st October 2020
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Thanks guys.

I can see there are threads in there that look fine as I look in from the right side, but the bolt will not start from the left side. I can rig a tap to get in there to clean the threads. It will need to be the 5.5" length plus extra for the T handle. Or better yet, I can notch a new grade 8 bolt to see if I can clean the threads that way.

Thanks for confirming the pitch. I just didn't want to force the wrong tap/thread cleaner into a 16 pitch hole.
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Old 21st October 2020
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I better look out front and see if he is still here. Thanks again.
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I'd just take the mount off and chase that way.
The drill size is bigger for a fine thread but the threads are taller on a course bolt.
It may be best to use a nut and a longer bolt but you'll know more about that after you chase it.

Technically, you could also chase it from the right side (installed) also.

Last edited by Hippysmack; 21st October 2020 at 02:17..
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Spent too much time talking, will get the bolt and modify it so we can clean those threads tomorrow. Thanks guys.
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Old 22nd October 2020
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On my 1991, the bolt into the head is 3/8-16 and nut on the stud the same. The two bolts that hold the bracket to the frame are 3/8-24. I've got mine apart right now. This is the front upper engine mounting bracket.

John
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Old 23rd October 2020
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Thanks guys. So, I can't ever remember shit. (CRS). The bike is actually a 1999. The third time he told me what it is finally sunk in. I got a 6" grade 8 (3/8-24) bolt to cut into a thread chaser, but the threads on it looked and felt so clean and sharp that I just ran it in and it cleaned the threads without any notching. So then we got a new 5.5" bolt and a 3/8" spacer (there is a gap between the case and the bracket). Sanded a bit off the spacer and it went in nicely. Some locktite and a few turns of the wrench and the job is done.
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Old 23rd October 2020
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Sounds good. Thanks for the update.
Glad the threads weren't damaged that bad.
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