Acerbis X-Factory handguard install on Honda CRF 300 L

Some background info in this post:

Noteworthy info

  • I have 30mm risers installed, so it gives me a little more room with the handguard mounts.
  • The bars are stock bars.

Prepping the bars and grips

To mount the guards you first need to have access to the inside of the handlebar. On the clutch side it’s a simple matter of cutting the grip end off. Or alternatively you could just cut a hole on the rubber bar end to have access to the M6 hole inside the bars. If you are planning on drilling and tapping the M6 hole to an M8, which size bolts most handguards come with, you will naturally need a bit bigger hole.

The bar end inserts can also be removed. How to:

First I used a punch to make a hole to see what’s in there
The M6 thread inside the bars

I want to mount the handguards so that there is metal against metal, so I proceeded to cut the rubber grip end off.

As you can see below, the threaded insert is flush with the bars on the right side, but recessed on the left side. No idea why, but it seems they are made like this on purpose.

The left side grip end cut off

The throttle side is easier to do if you remove the grip first (how to is there ->

First I cut off the rubber grip end and the drilled the end off with a 22mm bit. Then I trimmed the rubber for another 6mm and used a belt sander to even the white plastic part with the rubber.

The method above is an unnecessarily complicated way of doing things and you could just as well take the grip off and go at it with a hacksaw.

Grip end cut off
end drilled out
Further shortening is needed because the Acerbis guards don’t come with a bushing
Took off too little the first time and this is after the second cut
Finished throttle side grip

I did not have spacers or washers that would be an exact fit for the inside diameter of the bars so I had to make a temporary solution with what I had at hand.

I wanted the handguards to tighten against the threaded insert and not the bar end, hence the use of washers. If you are fine with tightening the guards against the bars, you can forget hunting for suitable bushing or / washers.

The throttle side does not require any additional spacers as the insert is flush with the bar end.


Acerbis X-Factory black / red
Included mounting hardware
The M6 bolt and washer I used
Throttle cables run rather nicely
Throttle side, I did not use anything between the guard and bars
Left side, I put couple of washers inside the bars to fill the gap
Throttle side mounted, everything is fine
Clutch side… not ideal. The clutch lever has not got room to fully reset

LOOK AWAY NOW, and don’t do what I did.

I got real tired of messing with the handguards and just shortened the clutch lever to be done with them. I’m getting shorter/adjustable levers anyway later on, so this solution will do for now. Again not recommended and probably illegal somewhere in the world.

Some pics below on how the mounting hardware is setup on the bars.

7 Comments Add yours

  1. wsnygiantfan says:

    Question, what is the length of the M6 bolt needed? I want to put handguards on, and keep my stock bars for now also. Thanks.


  2. Rosso says:


    Iโ€™ve got the same bike and purchased and installed the sam hand guards and just came across this website actually looking for info about AXP Racing rear rack. ๐Ÿ™‚

    Anyhow, getting back to the topic. Installation on the clutch side was pretty much straightforward even though I ran into the same problem: not enough room for the clutch to go all the way out. I resolved that by turning the hand guard a bit up and by repositioning the clutch lever together with the mirror a bit to the right. Now, it fits. ๐Ÿ™‚

    As far as the bolt is concerned, on the clutch side I used M6x50 but added a small spacer between the handle and the hand guard. It looks a bit nicer but can be done with the same bolt and without the spacer.

    The problem that I still did not solve is on the throttle side. I did pretty much the same as you except cutting of the white plastic. I did not see a reason for that nor did I have the tool to cut it with. ๐Ÿ™‚ After cutting off just the rubber part of the grip, I just expanded the whole in that white plastic to have enough room for the My bolt. But the problem is that there is not enough length in the bar to tighten the M6x50 bolt. I put M5x50 in just to see if anything is blocking the way but itsโ€™s not. So, the whole is there and is long enough but it seems that iโ€™s not tapped (or threaded?!) all the way. I could only tighten M6x20 which is surely not long enough and might break upon impact.

    How did you solve this issue on the throttle side?


  3. JN76 says:

    Hmmm… Interesting. I did not have similar issues and both threaded holes seemed to be deep enough. Is suspect there might be some crud on the threads that prevents you from using a longer bolt. In cases like that, I usually clear out the threads by using a tapping tool and some lubricant.

    That said, the inserts are apparently not that difficult to remove. There are supposedly visible marks on the bars where you can see the location of the “pins” holding the inserts in place. Drilling those pins out will enable the removal of the inserts.


  4. Rosso says:

    Thnx for a quick and detailed reply. Much appreciated!

    Liked by 1 person

  5. Bart says:

    I have the same red/black installed on my 300L factory bar using M6s. Positioning the brackets however was a challenge. I had to make some adjustments to make it all fit. Overall, from a install point of view I would not recommend these guards in combination with the factory bar. I went ahead anyway because I think they look great on the bike.

    Liked by 1 person

    1. JN76 says:

      Agreed. These are not the ones for this bike. You can make them work if you made the mistake of buying them, but I would recommend something like model specific Zeta’s instead.


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