Stripped seat bolt mount holes


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Big Bob
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Stripped seat bolt mount holes

Post by Big Bob » Mon Jul 01, 2019 9:27 pm



So when installing my Ultimate seat on my bike I discovered that one of the bolt frame mounts on the bike is stripped. Seems this is a semi common problem on the 1800. What have you done to fix the problem, just tap the hole, or did you end up installing a heli coil to fix the problem. Its holding, but I can't tighten it up the bolt completely tight, the passenger arm rest are a little lose. Any ideas or suggestions are appreciated. Thanks!

Bob


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Terry D
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Re: Stripped seat bolt mount holes

Post by Terry D » Mon Jul 01, 2019 9:51 pm

I would install a heli-coil. Because it is not a severe bolt hold. You might try the white tape used for plumbing to give the bolt a little bit bigger grasp on what ever threads are left. The torque value is not that much. That seat ain't flying off with you sitting on it.

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GoldWingrGreg
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Re: Stripped seat bolt mount holes

Post by GoldWingrGreg » Tue Jul 02, 2019 9:20 am

I repair those with TimeSerts and insert 18129 (14mm). The shorter one that comes with the kit can be used too, but the next size longer (16.2) is too long. Also, unless your seat requires special bolts, be sure to use OEM bolts. Many try lots of others, but the OEM ones are hands down best. If you have problems with them, use an awl to help line things up.

Read the home page to know why.
https://www.timesert.com

The size needed is a M8X1.25
http://www.timesert.com/html/mtrcsert.html

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WingAdmin
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Re: Stripped seat bolt mount holes

Post by WingAdmin » Tue Jul 02, 2019 1:35 pm

I agree with Greg on this one. A Helicoil will work, but whenever I'm fixing the threads on something that's going to be removed on any kind of a regular basis (oil drain pan plug, spark plug, etc) I would go with a Timesert every time. They definitely cost more, but they come with everything you need to do the repair, including the correct size drill bit, tap, etc. More importantly, the Timeserts have a tang in them that keeps them from backing out when the fastener is removed. Helicoils WILL at some point back out. On an application like this where the bolt will be removed every time the seat needs to come off, the Helicoil is not going to last.

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Wingsconsin
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Re: Stripped seat bolt mount holes

Post by Wingsconsin » Tue Jul 02, 2019 2:30 pm

Mine was a bit buggered up -- but I chased it with the correct tap and cleaned it up
There was still some meat in the hole so it worked OK -- the last (first?) 3 turns are missing so it acts like a pilot hole .
Tighter isn't always better -- some people are really heavy handed on fasteners... :roll:
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Big Bob
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Re: Stripped seat bolt mount holes

Post by Big Bob » Tue Jul 02, 2019 8:41 pm

Lots of good advice here, I like the teflon tape idea, but I think that is just prolonging the inevitable a permanent fix. Part of me wants to try to just do a tap and clean up the threads. Timeserts seems like the favorite by many people, just like the Ultimate king seat, it's an investment. I didn't use any force on the bolt when reinstalling it, so surprised me when it wouldn't grab (tighten) I have passenger armrest and it just doesn't tighten very well, its loose. Haven't lost the bolt, it just isn't very tight. What size tap would I need to purchase just to clean up the threads, I might try that first. Thanks again for the ideas and help, great knowledge!

Bob
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Re: Stripped seat bolt mount holes

Post by MikeB » Tue Jul 02, 2019 9:02 pm

The Tap size needed is a M8X1.25
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Re: Stripped seat bolt mount holes

Post by WingAdmin » Tue Jul 02, 2019 9:43 pm

The previous owner of my bike had stripped out the threads in my frame where one of the rear crash bars bolts into place. The way they "fixed" it was to fasten the crash bar in place with a zip tie!!! :shock:

And...to make matters worse, this is the same bolt used to hold my aftermarket trailer hitch in place - so any trailer being pulled was being held to the bike with one bolt and a zip tie! :shock: :shock: :o

The threads were history, so I drilled it out smooth and put a nut on the back. I replaced the bolt with a longer Grade 8 bolt that went clear through the hole in the frame, and fastened it in place with the nut. It's now stronger than it was as it came from the factory.

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Re: Stripped seat bolt mount holes

Post by Wingsconsin » Wed Jul 03, 2019 8:43 am

WingAdmin wrote:
Tue Jul 02, 2019 9:43 pm
The previous owner of my bike had stripped out the threads in my frame where one of the rear crash bars bolts into place. The way they "fixed" it was to fasten the crash bar in place with a zip tie!!! :shock:

And...to make matters worse, this is the same bolt used to hold my aftermarket trailer hitch in place - so any trailer being pulled was being held to the bike with one bolt and a zip tie! :shock: :shock: :o

The threads were history, so I drilled it out smooth and put a nut on the back. I replaced the bolt with a longer Grade 8 bolt that went clear through the hole in the frame, and fastened it in place with the nut. It's now stronger than it was as it came from the factory.
As long as it was the industrial Kevlar zip-tie you were probably OK... :shock:
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Re: Stripped seat bolt mount holes

Post by WingAdmin » Wed Jul 03, 2019 12:03 pm

Wingsconsin wrote:
Wed Jul 03, 2019 8:43 am
WingAdmin wrote:
Tue Jul 02, 2019 9:43 pm
The previous owner of my bike had stripped out the threads in my frame where one of the rear crash bars bolts into place. The way they "fixed" it was to fasten the crash bar in place with a zip tie!!! :shock:

And...to make matters worse, this is the same bolt used to hold my aftermarket trailer hitch in place - so any trailer being pulled was being held to the bike with one bolt and a zip tie! :shock: :shock: :o

The threads were history, so I drilled it out smooth and put a nut on the back. I replaced the bolt with a longer Grade 8 bolt that went clear through the hole in the frame, and fastened it in place with the nut. It's now stronger than it was as it came from the factory.
As long as it was the industrial Kevlar zip-tie you were probably OK... :shock:
Nope, it looked like a Harbor Freight cheapie, and it was broken when I found it!

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Re: Stripped seat bolt mount holes

Post by GoldWingrGreg » Wed Jul 03, 2019 12:03 pm

WingAdmin wrote:
Tue Jul 02, 2019 9:43 pm
The previous owner of my bike had stripped out the threads in my frame where one of the rear crash bars bolts into place. The way they "fixed" it was to fasten the crash bar in place with a zip tie!!! :shock:

And...to make matters worse, this is the same bolt used to hold my aftermarket trailer hitch in place - so any trailer being pulled was being held to the bike with one bolt and a zip tie! :shock: :shock: :o

The threads were history, so I drilled it out smooth and put a nut on the back. I replaced the bolt with a longer Grade 8 bolt that went clear through the hole in the frame, and fastened it in place with the nut. It's now stronger than it was as it came from the factory.
I've seen the bolts at the rear crash guard break too. Some will brake because the bike fell over and hit hard. The other reason I've seen them brake is because of the trailer hitch the fits there. The OEM bolts are actually stretch bolts that protect the threads in the frame. Since yours probably broke because of the trailer hitch, you might consider getting a different hitch. I believe Kury changed their design and their hitches no longer mount there the same way. Possibly that is why they changed their design.

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Re: Stripped seat bolt mount holes

Post by oilboy1162 » Wed Jul 03, 2019 9:07 pm

1) try to retap with proper tap thread.
2) get tapered bolts.
3) use good quality teflon tape, but don't over tighten.
:lol: I know people say we spend too much money on our rides, but I can't hear them when I'm 1000 miles away! :roll:

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Re: Stripped seat bolt mount holes

Post by lego1500se » Thu Aug 01, 2019 4:42 pm

Yes ...been there...cleaned the threads with brake cleaner and installed a fix-a-thread by Helicoil with red loctite thread sealer...let dry for a few hours and never had problems after...also replaced bolt with OEM .... 🙃

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Re: Stripped seat bolt mount holes

Post by Scooter363y » Fri Aug 02, 2019 8:41 am

I would try the helicoil first. That method removes the least amount of material from the frame. The helicoil does require more skill to install. If that should fail you can then go to a keensert.

A hint you can buy a kit that contains the correct drill bit, tap,and installation tool along with a selection of coils. Just a hint thread the coil through a m10x1.25 nut to pretension the coil just before screwing it into the frame to decrease the diameter slightly making it easier to get started.

https://www.amazon.com/Rocaris-Thread-M ... NrPXRydWU=

Big Bob
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Re: Stripped seat bolt mount holes

Post by Big Bob » Fri Aug 09, 2019 12:38 pm

Well I ordered a heli coil kit to repair my stripped bolt holes, and last night it came to me, is there enough room to use a drill for the holes for the heli coil or do you have to remove the bags. Look's like enough room w/o removing the bags. Any comments, tips, thoughts, I'm listening and appreciate the help!

Bob


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New to me with only 64K on the clock!
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