Brake reservoir screw head issue

[Bazbro_imp]

Note, screw heads on our 'bikes are NOT 'Philips' head, though they look like it.

They are the very-similar-in-appearance 'JIS' screw heads - superficially similar to Philips', but, crucially, a Philips screwdriver wil chew up a JIS screw head (unless the tip of the Philips has been ground away).

For the cost involved, it's WELL worth buying a (or a set of) JIS screwdrivers.

[satchit]

I did use [url=https://www.cyclegear.com/accessories/motion-pro-t-handle-bit-driver-with-jis-cross-head-bits?sku_id=1172012]JIS bits .

The other screw came out fine. I'm guessing this one is on a bit too tight. I'm letting the screws soak in some wd-40. Won't attempt removal till I have the replacement screws. I'm hoping one of the non-drilling solution works.

I should follow Juancho76's advice before I try anything too

[spechg]

Maybe an impact driver with a JIS bit in it would get it started, provided the screw head isn't already too damaged.

[Lord Popgun]

Vessel actually has a JIS impact screwdriver. I have one. It’s pretty cool and would have been perfect for a situation like this.

[GoldOxide_imp]

I'm surprised that nobody has suggested drilling the screw and using an Easyout.

(+1) My original thoughts too.

[Nachodaddy]

Thank you, Lord Popgun. I looked up the Vessel JIS impact screwdriver and found one on Amazon. Anybody who wants one, here's the link:
[url=https://www.amazon.com/Vessel-NO-250001-Impact-Driver-No-250001/dp/B001WHOV64/ref=asc_df_B001WHOV64/?tag=hyprod-20&linkCode=df0&hvadid=283244379562&hvpos=&hvnetw=g&hvrand=15436171197051266056&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=1013419&hvtargid=pla-441171485441&psc=1]https://www.amazon.com/Vessel-NO-250001-...5441&psc=1

[jtopiso_imp]

Look here:
https://www.youtube.com/watch?v=_mTFQbaT3Zc

I'd use method at 5:30, but with a nail and tapping with a hammer

[Bazbro_imp]

I have several types of 'impact drivers'... a Vesel JIS screwdriver type, a large manual one with interchangeable bits, and a 20v beast of a machine (great for car wheel nuts!).

But they frighten me... Bearing in mind that our engines are mostly alloy castings (including that brake fluid reservoir), whacking a 'screwdriver' with a hammer onto these castings seems very dangerous to me - a cracked casting seems a likely possibility.

I bought my Vesel impact JIS screwdriver to tackle the casing screws on my Yamaha. The first whack I gave it frightened the life out of me! But I'm a great big 'nervous nelly' anyway...!

I will soon be (gently!) trying the 20v impact driver on these screws, to see if I have better luck.

But 'impacting' with a hammer on some of these castings should be undertaken with great trepidation, imho.
.

[Houtman_imp]

BIG hammers can have a BIG impact on fragile castings : be very careful with them !

[Bazbro_imp]

BIG hammers can have a BIG impact on fragile castings : be very careful with them !

Exactly!