Broken Bolt on bike, help! - FMVperformance.com : The site for all your Ford Mazda and Volvo needs
 
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post #1 of 4 (permalink) Old 04-21-2008, 03:45 PM Thread Starter
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Broken Bolt on bike, help!

So I found an oil leak in a gear transfer cover on my Bike. Its an older 81 Yamaha XS650 and a starter motor was retrofitted by Yamaha in the bike's later years and this is the cover to the gears that transfer starter motor motion to the crank shaft.
Anyways this was leaking so I noticed the bolts on the cover were easy to turn. I kept turning them and it never seemed to tighten up and one broke right off. Now there are threads stick in this hole.

Does anyone know of a good tool to remove this bolt? I have heard of reverse drill bits, screw extractors and something called Easy outs. I know I am looking for some type of reverse bit that bites into the bolt. Anyone have advice on what to use and how it works?
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post #2 of 4 (permalink) Old 04-21-2008, 03:57 PM
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Re: Broken Bolt on bike, help!

you are on the right track w/ those extractor kits. should be able to get one at an auto parts store or hardware store.

was the bolt still spinning when the head snapped off? if it still spins, it might be tough to get the extractor to work. good luck!


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post #3 of 4 (permalink) Old 04-21-2008, 04:04 PM
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Re: Broken Bolt on bike, help!

Best bet on something like that that is broken off and still spins freely is to use a carbide tipped bit that is a much smaller diameter then the bolt that broke off if you can. Then drill off center of the bolt, this will help prevent it from spinning freely (you are going to need to use a much smaller bit, so if the bolt diameter is 1/4", you'll probably need to use a 1/16" bit). Then you can attempt to thread something into that hole and yank it out or pull and twist the bolt in reverse.

Worse comes to worse you may need to use a somewhat oversize bit and drill out the whole bolt and the sorrounding threading with a bit extra to spare (maybe 1/16" oversize). Then rethread the whole thing (which you might be looking at doing anyway).
-Matt
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post #4 of 4 (permalink) Old 04-21-2008, 04:37 PM Thread Starter
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Re: Broken Bolt on bike, help!

The bold wont spin freely as It was pretty dang tight just not as tight as I expected esp if it was on the brink of breaking and did break.  I am confused about why its bad for the bolt to be able to spin freely.  I assume that is what I want.  The bolt is in there pretty good I am sure, but I havent taken off the gear cover yet.

I found a set of left hand drill bits, you drill through the center of the bolt counter clockwise and apparently many times the screw will come out when you are just drilling the hole. 
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