FX Engines K303 DLC .21 3-Port Off-Road Buggy Engine Combo w/2131 Pipe

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FX Engines K303 DLC .21 3-Port Off-Road Buggy Engine Combo w/2131 Pipe
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Price: $549.99

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The FX Engines K303 DLC .21 3-Port Off-Road Buggy Engine with Ceramic Bearings is a high precision, high performance, racing engine. Designed to give you an extremely linear power band, this engine features 3-ports, improved fuel mileage, DLC coated crankshaft, matched piston and sleeve and given a 9-rib cooling head. All of these features are in place to give you an easy to run engine that makes great power and has great fuel economy. This specific combo includes a manifold and a 2131 Tuned Pipe.

  • Linear powerband with improved fuel mileage
  • DLC coated crankshaft
  • Tungsten balanced crankshaft
  • Ceramic rear bearing
  • Specially selected and matched sleeve/piston set
  • Individually lapped for easier break-in
  • 9 rib cooling head
Cylinder Bore: 16.4mm 
Displacement: .21ci
Porting: 3 Port

  • (1) FX Engines .21 K303 Nitro Engine
  • (1) Tuned Pipe
  • (1) Manifold
  • (5) Springs
  • (2) Gaskets

This product was added to our catalog on October 21, 2021

Austin Schaeffer
Verified Owner
Thursday, Dec 2 2021 (about 2 years ago)
FX Engines K303 DLC .21 3-Port Off-Road Buggy Engine Combo w/2131 Pipe
Just got done with my break in process and just put a decent race tune on it.

First off the packaging and presentation is amazing, you can tell they really go the extra step with their products! I first started the engine after warming it up to 240 degrees and it idled really high, you will need to reset the idle gap to .50-.60mm before you fire up. Set the midrange to .10, and this will give you a pretty good baseline for the first and second tank. Might need to lean out the LS a bit until you get a decent idle. I’m about 8 tanks in and this engine rips, it’s got some really good power and sounds really deep with this pipe combo. Engine is running great now and I don’t have any complaints! Just what you expected from the man himself, Mr. Hudy.
Brian Eiter
Tuesday, May 23 2023 (6 months ago)
FX Engines K303 DLC .21 3-Port Off-Road Buggy Engine Combo w/2131 Pipe
I got this FX engine from a friend of mine who just had it serviced and re pinched with new bearings after he put approximately 4-5 gallons on it. It’s in my practice car and I just beat the holly poo outta this thing. Just cracked open the 9th gallon and she is still making great power and easy to keep a tune in it. Not the best mileage now as she is getting a little tired but still hitting 7:08 on the clock. Definitely has me re thinking my next purchase for a race engine.