Jump to content
Yamaha Tenere 700 Forum

Engine mounts and crash bars


dobbi

Recommended Posts

Well, after quite a few fairly heavy offs on the RHS over the past few years I noticed that the oem carsh bars were sat 8-9mm from the frame and the upper front engine mount that holds the crash bars was missing.

 

I bought a new bolt but it was clear that the alloy threads of the engine has stripped. There is very little holding the bolt in and a tap on the crashbar will make the bolt pop out.

 

I am going to do a thread repair but I can't see any other way than removing the engine to do it as there is the engine mounting adjuster hollow bolt in the way.

 

Has anyone done anything like this before without having to remove the engine? not keep on epoxy resins and tapping as it is just not strong enough.

 

As a matter of interest, the oem crashbars get you to use the original engine bolt, so it is not screwed in perhaps 5 to 6mm into the engine. That is probalby why it stripped in the first place!.

 

Dave

Edited by dobbi
  • Like 1
Link to comment
Share on other sites

How much thread is left in total?  On my GS, I could get a longer bolt and use quite a few extra threads.

Link to comment
Share on other sites

As @katana says there could be more thread left as you said the bolt didn’t use many threads. Get a “depth gauge” rod to test the available depth to the base of the hole from the head then find a new longer bolt. You can tell how much thread is holding by comparing the two bolts then to be safe. 

Link to comment
Share on other sites

Its a bit hard to tell what has been stripped and what is good but there must be some good threads in there.

 

I'm waiting for a 12mm bolt to come which is a bit longer. original is a M12, 50mm long polt with a 1.25 pitch. I've got a 60mm and will space it out with washers if there is any extra depth left.

 

Im away for a bit trip in 3 weeks so haven't time to drop the engine to do a proper repair, but my only worry is that another big drop on the LHS (why is always on the LHS!) might strip the whole lot!

 

Thansk for the suggestions.

  • Like 1
Link to comment
Share on other sites

Well,

 

A good enough repair for the moment!

bolts.jpg.6e2491de25551bd51e2287e66e5fd0a1.jpgnewbolt.jpg.be68fba30c1aae89c727ff03664cf87a.jpg

 

a 60mm m12 bolt with the oem indented washer behind and one m12 washer in front (hard to get a flanged m12 bolt over 50mm).

 

There was a good 4 to 6mm of decent thread left so on it goes and lets hope for no big smash downs on the RHS (I wrongly said LHS in the last post.

Link to comment
Share on other sites

  • 4 weeks later...

Yup, it’s a bad design. Mine did the same. I cleaned the threads, got a longer bolt and installed with some loctite.  Hasn’t been an issue since but I haven’t crashed on it either. 

  • Like 1

 

 

Link to comment
Share on other sites

  • 2 weeks later...

This is making me scared with my Puig crashbars. Mine are also bent to pieces and mount in these holes.

The last thing I want is to strip threads in the engine on the next drop.

I wonder if this is just bad luck or if we will see much more of this in the future. A lot of brands mount their crashbars at these points. 

I can understand if this happens with aftermarket parts that use the wrong screw length, but it really shoulnd't happen with the OEM bars. 

 

Edited by OK185
Link to comment
Share on other sites

  • 2 weeks later...

It is not bad luck.  The RHS bolt is too short.  The LHS bolt is fine.  And, all the reports on here of whom have had problems, has been with the RHS.  EVERYONE that has the OEM crashbars should replace the RHS bolt before it becomes a problem.  Then just check all the crash bar bolts from time to time to make sure they stay tight.  Loose bolts will rip out in a fall.  Then you shouldn't have a problem.  If your worried about your aftermarket bars, just check the RHS bolts thread length, measure the threads in the engine and see if you need a longer bolt.  Easy enough.  

 

The reason this happens is the RHS of the engine has an engine adjustment spacer on that side and the LHS of the engine bolts tight to the frame without one.

  • Like 2

 

 

Link to comment
Share on other sites

25 minutes ago, DT675 said:

It is not bad luck.  The RHS bolt is too short.  The LHS bolt is fine.  And, all the reports on here of whom have had problems, has been with the RHS.  EVERYONE that has the OEM crashbars should replace the RHS bolt before it becomes a problem.  Then just check all the crash bar bolts from time to time to make sure they stay tight.  Loose bolts will rip out in a fall.  Then you shouldn't have a problem.  If your worried about your aftermarket bars, just check the RHS bolts thread length, measure the threads in the engine and see if you need a longer bolt.  Easy enough.  

 

The reason this happens is the RHS of the engine has an engine adjustment spacer on that side and the LHS of the engine bolts tight to the frame without one.

Thanks, I did not know about this. Can you confirm what bolt should we should use? M12 x 60mm socket cap screw?

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Our Friends

Tenere across the USA

Tenere 700 Forum. We are just Tenere 700 owners and fans

Tenere700.net is not affiliated with Yamaha Motor Co and any opinions expressed on this website are solely those of ea individual author and do not represent Yamaha Motor Co or Tenere700.net .

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.