Broken shock mount - how to replace?

Ok, here's the question of the day--

I found a broken shock mount on my 650 seca project (actually, technically it's not broken.... it was cut off shorter-----yep, both sides of the bike...............

So--

1. The stud is now too short to mount the standing handle

2.. One of the schocks was welded at the top because the stud was cut too short for the nut to go on.. What kind of idio.....oops--thinking out loud.

Question: I assume I will have to cut them off, drill them out, and istall new ones, so WHAT should I get to reinstall?

Tahanks in advance....

Dave F

 

I'll bet someone put struts on it and then trimmed the studs back.
As far as the right material to replace, I'm thinking some cold rolled steel or maybe a piece of wheel axle(might have to have it turned down). This will probably result in a trip to a machine shop unless you have a lathe and a Tig welder.

 

I'm assuming that the original studs can't be removed with the 2 nut method or stilsons?

 

They're "stubs" welded to (through) the frame IIRC.

 

might be able to drill and tap the stud and use a bolt instead of a nut, or if the shock eye is .5 inch or better, drill it all the way out and get some wheel studs, if you drill the right size the studs would pull into the frame and then it would just need a tack weld

 

Good idea.

 

You could call a Bone Yard and see if they have a bent frame without rear-end damage and have them cut you new sections too refit on your frame.

 

Well, I took a close look at it tonight.....seems to be that the mount itself is a single-piece part that the shock rubber slides onto, and then the threading is an extension of the part....still being all one piece of metal. I can't see any indication that it could be a stud threaded into a boss.

So..........

I guess I will start the rehab proces by grinding the threads back to flush with the shock boss and then start the drilling so that I can work up to the correct thread size again. I'll get a metric stud and thread it in, sealed with Red Locktite and torqued.

Geez.......now that I've long-since gotten over my fears of replacing any bike parts, tearing apart a carb set, working on getting over my fear of disassembling an engine so I CAN put it back together rather than just parting it out..................I have to start in on the 'fabrication' side of things.

Some guys are never content to stop learning, you know!?!?!

Dave Fox

 

I'll pop the upper mounting nut loose on one side of my Seca and tell you how long the new threaded portion needs to be.

 

How hard is it to take it to a certified welder?...youd be amazed.....thought,ideas,tags...most biker welders will let you clean the shop for a Kong,tabed or bracket... or...bout 25 a tab

 

Thanks Fitz! I was just assuming it would be the length of the other 650's, but I guess it would be good to have an exact measurement off of the correct bike since it's available.

Dave

 

Here you go: the threaded part is 18.5mm long, from the "shoulder" of the shock boss to the tip.

 

The "hardware" is a 4.3mm thick THICK washer against the top of the shock, then the standing handle which is 3.5mm thick, then the cap nut.

 

Thanks, and Len gave me the pitch/size of the threads themselves, so once I have the holes drilled I should be able to thread them and install some replacement studs.

Dave F

 

xj700

 

been on hold..... getting back to this shortly :roll: