Steering Stem Bolt Smartphone Ram Mount - Kawasaki Ninja 300


Introduction: Steering Stem Bolt Smartphone Ram Mount - Kawasaki Ninja 300

About: Just a guy who doesn't know when to quit, and is constantly in search of a solution to a problem that doesn't exist yet.

This is simply going to be a quick guide on how to make a phone holders mount for the 2012-2017 Kawasaki Ninja 300 (or Ninja 250), via threading the steering stem bolt. For a more comprehensive guide, see my other Instructable "Sportbike Smartphone Ram Mount". The goal is to be able to mount a Smartphone Holder centered directly on the handlebar. Also, this guide might get updated over time. To see the latest version, click here.


  • 2013-2017 Kawasaki Ninja 300
  • 2008-2012 Kawasaki Ninja 250
  • For the Kawasaki Ninja 400, use this phone holder

Difficulty: Easy
Tool Requirements: Basic
Time: 1 Hour
Cost: 10$


Working on any vehicle can be risky to both yourself and the vehicle. No warranties or guaranties, explicit or implicit, are made or implied regarding the compatibility, suitability or effect on any current warranties. All modifications should be made within the reader's capability and under their own exclusive responsibility.

A bit of motivation to keep making Instructables always helps. I'm a participant in the Amazon Services LLC Associates Program as well as eBay Partner Network, affiliate advertising programs designed to provide a means for creators to earn fees by linking to their sites, at no extra cost whatsoever to you.

Step 1: What You'll Need

Parts & Supplies

  • OEM or Aftermarket Steering Stem Bolt - This is what we'll be threading for the Ram Mount Post. You can use the OEM Steering Stem Bolt, or do it to an aftermarket bolt like the one linked if you don't want to risk the original part.
  • 1/4-20 Tap Set - We will need all three tap types for this job (Taper, Bottoming and Plug).
  • Tap Wrench - I personally prefer the ratcheting variety since it's quicker, but you can use whatever you have at hand.
  • Red Threadlocker - For this use, high-strength red threadlocker is preferable to blue threadlocker.
  • Tape - To mark the drill depth.
  • 22mm Socket - To remove the steering stem bolt. It's not exactly a standard sized, so if you think your socket set already has one, check first.

Step 2: Remove the Steering Stem Bolt

The first step is to remove the Steering Stem Bolt. It's a large hex bolt, so you'll need either a wrench or a 22mm socket (preferably the latter to avoid rounding the bolt).

Step 3: Put It in the Vice

Put it in a vice so we can work with it properly. Don't grab it too hard to avoid deforming the threads, and preferably put it in some v-jaws for cylindrical parts so it doesn't slide.

Step 4: Mark the Center

Now we want to mark the center of the bolt.

Use a ruler aligned with the hex corners to mark along the center of the bolt with the Center Punch's sharp tip. Make two or three lines to find the center, and then center punch it.

Step 5: Drill the Pilot Hole

Given how important getting the center right is, we will be drilling a pilot hole first to guide the main drill bit. I was going to do this in the drill press, but I decided to go with a hand drill instead since that is what most people reading this would be using.

Any small drill bit is fine. Since the bolt head is concave, the drill bit will naturally tend to center itself. Don't drill too deep. About a centimeter or less is as far as you need to drill.

Step 6: Drill the Main Hole

To be able to use the tap, we will need to make a hole slightly smaller than the threads. The correct drill bit for a 1/4-20 thread is 13/64", but since I wanted an extra tight thread I went with a 5mm drill bit.

I used a piece of tape to mark how deep I wanted the hole to be. Any unnecessary material removed is simply weakening the bolt, so we should make the hole only as shallow as needed.

The bolt is steel, so use a slow speed and a lot of pressure. You know you're drilling at the right RPMs and pressure when you're getting a thin, long metal spiral instead of splinter-like chips.

Step 7: Add Oil

To help the tap make the hole easier, add some lube. Any lube. Tapping Oil made specifically for the job is best, but hardly necessary. Even used motor oil will do.

Step 8: Start Tapping

First use the most tapered tap. Go slowly. When the tap binds, go back a rotation and then continue forward again. It is extremely important to make sure the tap is straight. Keep tapping until the tap can't go forward anymore.

Step 9: Blow Out the Chips

Since the hole is blind, we'll have to blow out the chips so they don't keep the tap from reaching the bottom. Engage your safety squints and blow the chips out.

Step 10: Use the Plug Tap

Once we can't procede any further with the taper tap, use the Plug Tap. Just repeat the same steps as before.

I moved the bolt to the bottom side of the vise to grip the head and avoid the bolt slipping or damaging the threads under the pressure of the vise's jaws.

Step 11: Use the Bottoming Tap

Now it's finally the Bottoming Tap's turn. With this tap you'll be able to just almost thread the hole until the bottom. Make sure to blow out the hole before concluding you can't tap any further.

Step 12: All Done

Perfect! Now we have a tapped hole where we can thread the Ram Mount Post. Let's proceed to installing it.

Step 13: Install the Steering Stem Bolt and You're Done!

To install the steering stem bolt again, we only have to screw it back on. The correct torque for the Steering Stem Bolt is 44 N·m / 2.0 kgf·m / 32 ft·lb, which is "pretty tight, but don't over-do it". Just set the right value on your torque wrench. No threadlocker is recommended per the manual.

Once the Steering Stem Bolt is properly torqued down, we need to screw in the Ram Mount Ball. Ideally, red threadlocker should be used if you won't be removing the steering stem bolt in the near future. If not, blue threadlocker is also an option if you already have it at hand, but be aware that the ball might come loose sooner rather than later.

And there we go! Now we just need the right attachment for it. Ram Mount is a system so you'll have to choose what components you like best (check my other Motorcycle smartphone mount DIY for more info on that). The most universal option is Ram Mount's Universal X-Grip Cell Phone Holder.

Thanks for reading! If you found this interesting, click the 'Follow' button up on the right to get notified of similar projects in the future, or check out my profile to see what other projects I've been up to — here are some you might like:



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