Specializing in Heavy Duty and Performance Parts

Yerf Dog GX150 Spiderbox GY6 Go-Kart Engine 150cc, 175cc, 184cc (new or rebuild) GUARANTEED FIT

  • $199.00
    Unit price per 
Shipping calculated at checkout.


This is the new 150cc, 175cc or 184cc GY6 engine for YERF DOG SPIDERBOX GX150--Guaranteed Fit or rebuild for your engine! This Bolt-Up Direct Fit engine for your vehicle is not available anywhere else.  It is specifically custom modified to be a direct fit for your vehicle. 

READ WARNING BELOW ON CHEAP EBAY AND AMAZON ENGINES

ONE YEAR WARRANTY

ADD A UNI-FILTER TO YOUR ORDER AND GET A ONE YEAR WARRANTY. 


YOU HAVE FOUR ENGINE OPTIONS 

  • Engine 1: Rebuild your current engine. Click here.  Send us your engine with our shipping plan.  We rebuild as explained Click here.  

  • Engine 2: New 150cc Standard stock GY6 Engine with stock transmission--GUARANTEED DIRECT FIT.  

  • Engine 3: New 175cc GY6 Big Bore Engine with stock transmission--GUARANTEED DIRECT FIT.  This engine comes with the 62mm big bore cylinder and piston kit pictured below installed in a bored out case.  Performance transmission recommended--Click here.  

  • Engine 4: New 184cc GY6 PowerStroke Engine with stock transmission--GUARANTEED DIRECT FIT.   This engine comes with the 62mm big bore cylinder and piston kit installed in a bored out case and a 3.0mm high performance stroker crank.  Performance transmission recommended--Click here.  

YOU HAVE FIVE POWER PERFORMANCE OPTIONS

  • Option 1: American made high performance Uni-Filter air filter ensures clean air to your engine and long life.  See why a NEW Uni-Filter is MANDATORY for ALL new engines and purchase at this link.   Your one year new engine warranty applies only if a new uni-filter is purchased with this engine.  If you don't get a Uni-Filter you are guaranteed to be putting dirt into your clean NEW engine.  See Details

UNI FILTER ASSEMBLE, OIL AND KIT

  • Option 2:  BDX High Performance Transmission and Gates Powerlink Belt:  Click here to see detail or add to your order..  If you add this option the parts will installed into your new engine. A Performance Transmission is the difference between a sluggish, slow and inefficient go-kart and a peppy, speedy and powerful go-kart that utilizes the full power of the engine.  See detailsRegular price $249 - Now FREE when you send us your old core engine.  See shipping prices for you to send us your old engine.

  • Option 3: The BDX A12 Cam Shaft changes the power profile of your GY6 engine  to provide the optimal balance for both low end grunt and top end speed.  If you purchase the A12 Cam Shaft it will be installed and tested in your new engine.

BDX PERFORMANCE A12 RACING CAMSHAFT - TORQUE

  • Option 4: 11 Pole Stator, rectifier and harness adapter.  With this option you get more power to run your lights and other accessories.  If you get this option it will be installed and tested in your engine--Click Here.  The engine comes stock with an 8 pole stator.  

  • Option 5: Performance Exhaust:  You can get the BDX performance exhaust for any of the engines above for an estimated 10% to 15% increase in raw power--see video!.  Your stock exhaust is restricting your power because the exhaust gases are being squeezed out through a tiny hole.  The BDX Performance Exhaust fixes that.  If you get a performance engine without the performance exhaust you will be restricting some of that NEW powerTo see details or add the exhaust to your order click here.  Or see our video to see what this increased horsepower looks like in a race click here.

 


ADDITIONAL IMPORTANT OPTIONS:

  • Shipping Insurance:  We strongly recommend getting shipping insurance.  Our nearly 20 years shipping engines we have seen a lot of damaged engines and carelessness from shipping companies and little accountability on their part.  Shipping insurance helps to protect your investment.  Also see extra packing below..  Click here for shipping insurance.

  • Double Boxing and Double Padding Your Engine:  Even with insurance we have seen UPS deny insurance claims because UPS claimed that there was not enough styrofoam around the engine.  We know it is a scam because they should NEVER be dropping or throwing our engines but it is what it is..  With this option we double box your engine in a second sturdy box and add extra 1 to 2 inches of styrofoam for extra protection.  Click here for double boxing.

Read article on how displacement relates to more power.

How big bore kits & strokers work

TAKE A LOOK AT THIS COMPARISON

Stock GY6 Engine

 

BDX Performance Engine

 

We build and test our 175cc big bore engine in our facility in Virginia.  

We disassemble your 150cc engine, bore the case to make it larger so that we can install a 62mm big bore piston and cylinder.  Then we re-assemble and test your engine.

Boring the Case for the 62mm Cylinder and Piston

62mm 175cc Big Bore Kit

Be sure to read the article on how displacement affects your power.

Click here to see additional important information regarding this engine.

Before purchasing an ebay engine, that could be a 125cc, let us rebuild your engine for $199 with a one year warranty!

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