What is this long bolt under the carbs?

[Omarel]

I just noticed a bolt going through the frame right under my carbs was loose. The nut must've popped off.

• Does anyone know what thread and nut is needed to tighten this back up?
• and what is this bolt for?

on the right side of the bike where the nut was.


left side where the bolt goes through

[choneofakind]

Engine mount! You lost a nut. Get a new one, and torque it properly. 24 ft-lbs is ringing a bell...

Don't ride it until you get this replaced.

[Omarel]

Thanks!! Do you know what size nut or what thread this is. I left the bolt on the bike, not with me. I want to buy the nut tomorrow.

[Motofool]

That is one of the three long bolts that anchor the engine to the frame:
http://www.ronayers.com/oemparts/a/k...1/engine-mount

Actually, it keeps the frame from bending, as the engine is a load bearing element of the frame.

You need Kawasaki part 92015-1180, which is a flanged M10x1.25 mm hexagonal nut (external diameter of bolt is 10mm with a pitch of 1.25 mm).

Use a 14mm socket and apply a torque value of 24 ft-lbs.

Although OEM is the correct grade, any temporary nut will keep the bolt from damaging its thread due to vibration and backing out.
I have found good quality hardware at PepBoys.

The bolt is what does the shearing resistance, while the nut keeps it in place while reduces overall vibrations.
If I remember correctly, there is room for two nuts there.

Check the one for the lower bolt as well.

[CaliGrrl]

I think mine were 10mm. I lost two of them. Now they have loc-tite on them, and paint spots so I can see if they start backing out again.

[Omarel]

ok great!

you think I can find this nut in home depot or lowes. The official stuff will take too long

10mm but tighten with 14mm socket...?

[choneofakind]

10mm bolt (inside hole on the nut)

14mm socket (hexagon on the outside of the bolt)


Use something local short term. Order the official OEM nut and swap when it gets delivered. Those are not items to be scavenging for a long term solution from the hardware store.

[Omarel]

Ok Cool! Just ordered

[Omarel]

I ordered OEM but waiting.

In the meantime, I bought this Nut from home depot: M10 x 1.25 but it doesn't continue spinning all the way through. Could the thread be wrong?

[RacinNinja]

Hmm....parts fiche doesn't give a thread pitch but if I had to guess, it's 10x1.0. That's a common size on motorcycles.

[jkv45]

Originally Posted by Omarel

I ordered OEM but waiting.

In the meantime, I bought this Nut from home depot: M10 x 1.25 but it doesn't continue spinning all the way through. Could the thread be wrong?

As Racin' noted - it may be 1.0 mm pitch.

If it won't thread on by hand until seated, it's not right and will mess-up the threads on the bolt if forced.

Plan to have some blue Loctite on hand when you put it back together. A Torque Wrench is a good idea also. It's not really torqued that tight (24 ft-lbs)

[RacinNinja]

On another note, this is an excellent reason why I wash my bikes regularly. It gives you a chance to get up close and personal in all the nooks and crannies to spot things like this. It's not just to have a clean bike.....

[FrugalNinja250]

Originally Posted by jkv45

As Racin' noted - it may be 1.0 mm pitch.

If it won't thread on by hand until seated, it's not right and will mess-up the threads on the bolt if forced.

Plan to have some blue Loctite on hand when you put it back together. A Torque Wrench is a good idea also. It's not really torqued that tight (24 ft-lbs)

Most metric bolt sizes have at least one fine pitch and coarse pitch available, sometimes more than one in each. Pitch in a metric bolt is the distance in mm between threads. Thread diameter is the outside diameter of the threads on the bolt part of the threads (and thus the largest diameter in the nut threads). The 10mm series thread has two coarse pitch options, 1.25mm and 1.50mm, and one fine pitch option, 1.0mm. It would be extremely unlikely that this bolt is fine-threaded. Motofool posted the spec as 1.25mm. Chances are that the nuts were mixed up at the hardware store.

I would just leave the bolt loose until the new nut comes in. Don't take a chance trying to force that nut onto the bolt. The bolt can't actually come out because the fairing blocks it. Just look down there every once in a while and push it back in place if you feel like it.