Chain adjusting bolts that screw into the aluminium swing arm, have snapped off insid the swing arm??

Question

I have a Yamaha YZ125 and the chain adjusting bolts that screw into the aluminium swing arm, have snapped off inside the swing arm?? any suggestions. Please??

Answer 1

Small drill bit, and small tap. Drill a small hole and tap it to give it a thread. Then thread another bolt into it and use *that* to get it out.

Answer 2

You guys who say use a screw extractor to get broken off bolt out of an aluminum swing arm have never tried it. Chances are 1 in a 1000 it will come out. Think about it, the bolt broke because it was corroded and bonded to the aluminum. Screw extractors are hard steel, and brittle. Best, safest, and only proper way is to drill the bolt out, as several described, start small, and work up. Decide which thread repair kit to use, Time-sert, or Heli-coil. Drill to the proper size bit for the tap in the kit, and install the insert, Would not hurt to use green Loc-tite on it. For most things, Time -serts are best, but for this, a Heli-coil, which is stainless would be best, as not as likely to bond to the adjusting screw.

Good luck, put the Easy-outs away.

Tomcotexas

Answer 3

Tomcotexas is right on the nail, do what he says or risk a big repair bill or writing off you s/a. Extractors/easy-outs will only work if a thread has been over-stressed and sheared off, NOT on bolts that have bonded to ally or rusted in. If you don't feel capable of doing the job, take it to a garage, they will have the taps, heli-coils etc, it will be a lot cheaper than buying them.

Answer 4

When they say a small drill bit - they mean 1/16"
Start very, very small, to drill a pilot hole.
Then drill into that with a 1/8" & keep stepping up by 1/8"
Using to big of a drill bit to start with, will dull the drill bit in about 15 seconds and will cut nothing.
Best to use a "carbide" drill bit.
And use plenty of cutting fluid - if none is available use WD40.
It will help cool the bit and keep it sharp.
DO NOT apply pressure on the drill while drilling.
Let the drill bit do the work - otherwise you'll snap it off in the hole and will have to buy a new swingarm.
If you don't follow these instructions...well, it's your bike.
Wreak it any way you like.

Answer 5

That is plain bad luck. You will need to either drill out and re-thread the offending part or if your engineering is not up to the standard get someone to do it for you.
Helecoil inserts are and alternative if the thread gets damaged. A local engineering firm will do this for you, one that carries out engine repair work. Ask at a local car repairer if you do not know of one in your area.
It will mean a bit od stripping down of your bike and then transporting it to them. Alternatively remove the swing arm and just drop that off
Good luck

Answer 6

Screw extractor drill a small hole in the bolt that is in the hole you need to use then screw the extractor into the hole as it's a opposite thread the screwing action will withdraw the snapped bolt

Answer 7

I would try the screw extractor first...

If that dosnt work... it depends how far in they have snapped..

If your good with the drill you can progressivly drill the hole bigger & bigger until there is only a thin bit of the bolt left in the hole.. & then lever it carefully out with a screw driver..

or drill it out completely..& then use a "HELI COIL" to rethread the hole... Or tap it out to the next size up bolt...

Answer 8

most are close in theory...

tools needed: electric drill, bolt/screw extractor (easy out), and drill bit sized as stamped / specified on the extractor.

take thel drill bit and attempt to drill in the middle of the broken off bolt. .... only need to go in about .25 deep (1/4 inch).

insert the tip of the extractor into the hole, and turn counterclock wise (unscrewing motion). the extractor is designed where it will try to screw into the hole (left hand thread of sorts) that you drilled, and upon getting tight, will start applying the needed force to unscrew the broken off bolt.

common size is 7/64 extractor, can be bought at auto parts stores for $2 to $3...

example here ~> http://www.nextag.com/Hanson-53402-Spiral-Flute-549593957/prices-html

been there, done that dozens of times... doesn't hurt to spray everything down with liquid wrench (spray like WD-40, but penetrating effect)...

good luck!!!

Answer 9

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