Managed to strip a bolt

Z

Zephyr

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Yamaha brake reservoir bolts are made from butter and this is a fact.
Tried with a philips and totally obliterated the first one I tried.
Tried again with a flat, pushing down, made things worse.
Seems they are stuck for good in there.
Ordered four new ones but have to somehow remove the old that are not willing to cooperate...
Now what do I do?
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Zephyr said:
Yamaha brake reservoir bolts are made from butter and this is a fact.
Tried with a philips and totally obliterated the first one I tried.
Tried again with a flat, pushing down, made things worse.
Seems they are stuck for good in there.
Ordered four new ones but have to somehow remove the old that are not willing to cooperate...
Now what do I do?
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I have to do this regularly at work and it's actually not a problem.

First, flatten the screw head with a suitable piece of metal and a hammer. I mean really flat, so that the profile for the screwdriver is almost invisible. Then take a philips BIT (including the bit holder) and hammer it into the screw head. Leave the bit in place, remove the holder, clamp it into a cordless screwdriver, and unscrew the bolt. Apply a lot of pressure from above. It can also help to tighten the screw a tiny bit first; then it sometimes comes off more easily.
 
The Japanese us a different cross-point to us. It is not Philips, although it looks like it is.

They use JIS.

daitool.com

Phillips Head vs JIS Screwdriver - Japanese Industrial Standard Screwdrivers

Screwdrivers are one of the most widely used tools around. Even if you’re not into DIY, you’ve probably got a screwdriver somewhere in your home. They’re the first tool that most people get, and often, they’re the start of a lifelong hobby in craft, carpentry, electronics, or DIY. Screwdrivers...
daitool.com daitool.com

A Philips screwdriver bit will chew a JIS, as it is looser, but a JIS won't chew a Philips, although it takes more to pressure to engage it.
 
Japanese bikes need JIS screwdriver bits, not expensive and a damn sight quicker and easier than bu**ering about trying to fix things. Go on, ask me how I know. If you've got a good centre punch you may be able to get it on the outside of the screw head and drive it round.
 
Personally I would drill the centre of the head a few mm with a drill bit of, say 5.5mm. Then gently knock in a torx bit of 6mm. Usually works for me.
It can be done with a hex head (allen key or similar) but the torx bits have more edges to grip.
I wouldn't use an impact driver, chances are it will shear the head off, then you are in even more of a pickle! ;)
 
Managed go remove this one with a dremel.
Then with a JIS screwdriver tried the rest.
They were all stuck no matter what. WD40, anti seize and finaly heat.
Heating the reservoir was my last hope. Used a heatgun, my special coil and then a torch that melted the paint and made a mess.
Got so mad that I drilled the sh.t out of them and removed both reservoirs to completely strip and paint again.
And ordered four good solid european bolts to replace them.
Thanks for all the advice, it seems that Yamaha is not what it used to be anymore since they moved production to France and the the MBK facrtory. They make bolts from cheese not from metal.
 
And round here we've got free-range sheep. Not that I'd resort to stereotypes, oh no. The thought of living somewhere where you can see the turds bobbing about in the clear water doesn't seem right somehow, at least in our murky brown sea you don't know what's coming.
 
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