Acerbis vs IMS Tank // KTM 3-Fiddy

Acerbis vs IMS Tank // KTM 3-Fiddy

So I’ve had the opportunity to install and ride with both tanks now, the Acerbis 4.1 gal and IMS 4.5. Both tanks are very well made and each has their area where they shine. You can’t go wrong with either that’s for sure, but below is just my thoughts on each.

Comparison Views

Acerbis Top View

IMS Top View

Acerbis Side View

IMS Side View


First things first, how well does each tank fit on the bike, mount up and how well do the stock shrouds fit. Each tank “fit” on the 350 EXC-F very easily and nicely, neither were perfect that would grant them a 10 score but I had no issues actually fitting either one on the bike.

Neither tanks gave me any problems mounting the stock shrouds to the tank, I personally like the fact that both IMS & Acerbis give you that option to use your stock side panels, unlike many past aftermarket tanks.

I gave the IMS one more point in the mounting area because I like the way the tank “wings” attach securely to the radiator.

Probably the number one question I get asked is which tank is better with a tank bag, while a tank bag can be used with the Acerbis, as I’ve done it on a 3 day ride, but clearly the IMS will fit a tank bag much better.



Build Quality

At first I gave the Acerbis a bit node in the build quality just by handling each tank. Then, as you can see on my Acerbis review post, I had an issue with one of the mounting holes for the fuel pump. It appeared to be a factory mold issue which I was able to fix with a Time-Sert and never had any fuel leakage. The IMS has brass threaded inserts for all mounting points, which for me is a plus.

I did not measure the thickness of each tank but it does appear the IMS is thicker plastic than the Acerbis. On another note… the Acerbis fuel cap/mount is very cool!




Well it’s not usually a requirement for a fuel tank to add protection….. but all the aftermarket tanks I’ve purchased that’s always been a talking point.. “the larger tank really protects the radiator well..”

So I thought I’d add a section for protection, namely the radiator. The IMS clearly hugs the radiator quite well from the sides, the Acerbis does come lower on down the radiators than the IMS but there’s not a large difference here. BUT.. if you need to get to your rear shock for easy removal without taking the tank off, the Acerbis allows you to reach the top mounting bolt for your shock.




And once again, this is not a requirement of a tank.. but most of us want our ride to look good. The natural color probably isn’t your first choice if you are looking for style points alone, but the ease to see fuel levels at all times on a long ride for me is more of a priority.

Due to the weird tall fuel cap spout of the Acerbis, I lean towards the IMS on style alone. For me the IMS matches the lines KTM originally created for this bike and looks more natural than the Acerbis. But to each his own right!



Acerbis Bike View

IMS Bike View


It’s no surprise here… the winner (for me) is…

What puts it out in front is the brass mounting inserts, overall look on the bike, added protection, and for the same price .4 gallons more of fuel!

Acerbis Fuel Tank

  • Gallons: 4.1
  • Price: $248.50
  • Weight: 7 lbs

IMS Fuel Tank

  • Gallons: 4.5
  • Price: $247.99
  • Weight: 6.7 lbs

Again, both are great options and are well made, these are just my thoughts on the tanks for the 2017 KTM 350 EXC-F!

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  • Adam M
    Posted at 14:58h, 14 September Reply

    Does the new version still have a mold number— ktm-26?

    • Basher
      Posted at 19:22h, 18 September Reply

      I believe it does.. but will take my seat off and verify it for you!

  • Mr. HighFive
    Posted at 14:54h, 21 September Reply

    That IMS tank sure does look better…..with longer range too. Sweet!

  • Curtis Wayne Jones
    Posted at 20:07h, 07 December Reply

    Basher great info as always.

    One question does your low fuel indicator still work w/ the new tank… and if so does it come on with sufficent reserve fuel still left?

    The reason I’m asking is that I’m considering going with a black IMS tank on my new 2018 500 EXC-F.

    Cheers – Curtis

    • Basher
      Posted at 09:28h, 11 December Reply

      So don’t quote me on this.. but my low fuel light seems to come on correctly, I’ve only ran it on this IMS tank low once on a ride and the light came on and I was riding so hard I didn’t take exact note of it, I just fueled up at the next stop.

      So if anyone else has more info on this please let us know until I can test for certain.


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