JIS Screwdriver Set - Kawasaki KLR 650 Forum
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post #1 of 19 Old 05-20-2012, 07:48 PM Thread Starter
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JIS Screwdriver Set

I have a 1982 Yamaha Maxim 650 that I want to work on. Many of the 'Phillips head' fasteners on this bike aren't. They are J.I.S. (Japanese Industrial Standard) fasteners. Phillips are torque to yield and JIS are not. The angles of the fastener head that are engaged by the driver are different. A Phillips driver on a JIS fastener renders a boogered fastener. Have any of you used any JIS drivers? I am looking for a good set and want recommendations.
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post #2 of 19 Old 05-20-2012, 11:57 PM
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I have a set and wouldn't be without them. Wish I would have had them before I wrecked a few of the JIS fasteners on the KLR including one I had to drill out.

I got mine from RJR. They weren't cheap but they are a very nice driver.



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Last edited by klr4evr; 05-21-2012 at 08:18 PM.
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post #3 of 19 Old 05-21-2012, 01:33 AM
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Originally Posted by efigalaxie View Post
Have any of you used any JIS drivers? I am looking for a good set and want recommendations.

Bought a set of four bits from a tool house off the Internet.

I commend to you two other approaches.

1. A SAE Phillips bit can be somewhat "JIS-ized," if you BLUNT its tip. Hit the bench grinder with it, if you dare.

2. SAE Phillips, or JIS, YOU CANNOT APPROACH THE SCREW-HEAD SAVING POTENTIAL OF AN IMPACT DRIVER when struggling with stubborn fasteners on a motorcycle.

An impact driver, by design, torques a screw head ONLY when the threads are relieved from a hammer blow. Two advantages: Effective extraction of, for example, steel screws in alloy cases, perhaps stuck from the adhesion of Galvanic corrosion, and . . . the consequent avoidance of boogering the screw head.

Where, oh where, might one find an impact driver? You can flag down a Snap-On truck, and pay lots of money for a quality product, or . . . you can buy a genuine made-in-China model, crude but serviceable, from Harbor Freight for probably less than $ 10.

Regardless, I consider an impact driver essential for working on motorcycles, SAE Phillis-head, JIS, hex head, whatever fasteners you may encounter.

Here's an image of a JIS screwdriver set from somebody (don't think this is necessarily an impact driver; well, maybe it is!):

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Last edited by LoneRider; 05-21-2012 at 01:45 AM.
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post #4 of 19 Old 05-21-2012, 07:54 PM
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This is a good post. I need to get a set of these myself. So far all I've dealt with screw-wise are carburetor boot clamp screws and the screws that hold the cap thing on top of the carb and they weren't too challenging. Sooner or later, though, I'll need to get a screw loose like the ones on the front brake master cylinder cover and will most likely be glad I invested in the proper tool.

Good assessment of the value of an impact driver, LoneRider. I should also pick up one of those (most likely the Chinese Harbor Freight version.)

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post #5 of 19 Old 05-21-2012, 08:06 PM
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I got a Harbor Freight impact driver quite a few years ago so maybe this doesn't apply. The driver is still good but the bits were so cheap they just twisted. Have to pick up some better quality bits.
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post #6 of 19 Old 12-31-2013, 01:58 PM
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When I got my doohickey kit from Eagle Mike, he threw in a set of stainless steel, hex head replacement screws for the front brake master cylinder reservoir cover (thanks Mike!). While attempting to unscrewing the old screws, the standard Phillips head driver started to cam out. Stop!
I remembered this thread and proceeded to ordered a set of JIS drivers through Amazon. The new drivers arrived yesterday.

Wow! These things are magic! What took me so long to get a set?

Highly recommended to anyone doing their own KLR wrenching.
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post #7 of 19 Old 01-02-2014, 02:29 PM
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I just got my brother in-law a set of JIS drivers, got them through Amazon I think it was like $25-$30 for a set of 4. I'll probably order a set soon too for myself.
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post #8 of 19 Old 01-02-2014, 05:42 PM
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Originally Posted by Gwardy View Post
I just got my brother in-law a set of JIS drivers, got them through Amazon I think it was like $25-$30 for a set of 4. I'll probably order a set soon too for myself.
A most thoughtful gift, Gwardy!

For his birthday, give him an IMPACT DRIVER!

Snap-on impact driver shown with four JIS bits. A Harbor Freight impact driver, with bits, will cost around $ 5; the Snap-on tool shown is 50 years old. Today, the Snap-on would cost around $ 50, I imagine.
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post #9 of 19 Old 01-02-2014, 06:38 PM
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JIS screwdrivers

I work as a motorcycle mechanic and would'nt be without them
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post #10 of 19 Old 01-02-2014, 07:28 PM
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What, exactly, are we talking about? Image from Motorcycle Consumer News:

Now, if you want to upgrade your master cylinder reservoir cover machine screws, lookie here:

And, back to basics: The "NUCLEAR OPTION" of the IMPACT DRIVER remains profound, regardless of bit configuration choice. The impact driver applies torque to the fastener ONLY when the threads are relieved by a hammer blow, a characteristic nearly certain to loosen even fasteners suffering the adhesion of Galvanic corrosion from contact of dissimilar metals, as in steel machine screws and alloy carburetor bodies. CAUTION: Do NOT use an 8-pound sledge hammer at full swing, when loosening a carburetor or master cylinder reservoir machine screw; no need to destroy the part in order to save it! Sharp, fast raps from a reasonably-sized ball peen hammer will do the job.

Last edited by Damocles; 01-02-2014 at 07:35 PM.
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