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4b: ATV ENGINE 2: New High Performance ATV GY6 175cc Big Bore POWER Engine

To verify that this engine is compatible with your vehicle, select your model and come back to this listing. The listing will automatically give you compatibility information.


CUSTOM PRODUCT
USA-made. Built custom for you in VA!
This is one of our CUSTOM BUILT unique BDX products and has an extended timeframe before shipping. Please call to get an estimated time to produce and ship.

If you have a special event (birthday, vacation, etc.) or some other hard deadline, please call and will tell you if we can meet that target. If necessary we may be able to get it done for you per your schedule for an additional (reasonable) rush charge.
READ OUR SHIPPING POLICY
READ OUR RETURN POLICY


More CC means More Power


Read our article on how displacement relates to more power.
How big bore kits & strokers work

[*] Fits 150cc, 170cc, 200cc ATV's with GY6 Engines and many buggies with the internal reverse engine.
[*] Has built in reverse with shifter in the middle of the engine on the right side for ATVs

With this engine we take a new 150cc internal reverse GY6 engine, completely strip it down, bore out the case and rebuild the engine from the ground up with the 62 mm 175cc big bore piston/cylinder kit and any other performance parts that you desire.



Is this you rolling back down the hill?

Stock GY6

Get the power you need!


The clip above shows hill climbing ability of our flagship 184cc GY6 engine (stroked, big bore, and high compression). (This is NOT the same engine being sold in this listing) The purpose of this comparison is to showcase our ability to radically (and reliably) improve the performance of the GY6 engine. The 175cc will make it up this same hill, unlike the 150cc.


CVT Upgrade InstalledCVT Upgrade InstalledElectrical UpgradedElectrical Upgraded




Professionally Machined Big Bore Prep


Guaranteed true 175cc


Don't be tricked by "200cc" and "180cc" engines on the internet that are actually 171cc. Our engine uses a high quality 62mm piston for exactly 174.5cc actual displacement.


Large valves for higher top-end powerLarge valves for higher top-end powerArrives with Large Valves Installed
The large 27mm/24mm valves allow the engine to breathe better at high RPM, allowing for higher top speeds. This is a very noticeable improvement if your original engine came with the smaller 24/23 valves.



8-pole charging upgrade8-pole charging upgradeAlso includes STAGE 1 Electrical Upgrade
This engine comes from the factory with our S1 Electrical package, which generates more electrical power for lighting and charging the battery more rapidly.



Light up the trails!
The high output stator allows you to add extra lights and accessories.

Improved debris blocker installedImproved debris blocker installedIntake manifold inlet includedIntake manifold inlet included


There are two popular internal reverse engines. Please look closely at your sprocket on your engine to determine which engine will fit your ATV or buggy. Before manufacturing or shipping we will talk to you to confirm which engine fits your ATV or buggy.

It's also a good idea to grab a couple exhaust gaskets for the install.

Engine is shipped DRY with no oil. Be sure to add 750ml of 10w40 to the crankcase and 120ml of 80w90 to the gearcase before starting.

What's included:
Starter, stator, and intake manifold arrive bolted to engine. CVT transmission is fully assembled and cover installed. All final transmission components are assembled and cover installed. All drain bolts and filter are included. Valve cover installed.


Shipping Timeframe


These engines a built in low volume and tested before shipping. Delivery lead time is approximately 2-3 weeks after ordering.


IMPORTANT NOTES

No returns on engines.
Please do not return your engine. In the very rare event that there is a warranty issue please see warranty section.

Engine is shipped DRY with no oil.
Be sure to add 750ml of 10w40 to the crankcase and 120ml of 80w90 to the gearcase before starting.

What's included:
Everything under the engine's covers and plastics is included and installed, this is a complete unit. Starter, stator, and intake manifold arrive bolted to engine. CVT transmission is fully assembled and cover installed. All transmission components are assembled and cover installed. All drain bolts and internal oil screen are installed. Valve cover installed.

Sold separately:
Carburetor, exhaust, ignition components are all sold separately.

Remember to adjust valves after break-in period.

IMPORTANT INFO

  • Complete Engine & Transmission

  • 62mm Big Bore (+5mm)

  • STAGE 1 Electrical System

  • STAGE 1 Transmission

  • Internal reverse engine

  • Item #721

SUPPORT VENDORS WHO
SUPPORT THE SPORT!

Your order helps fund future upgrades!

BDX DIGITAL GY6 DYNO PROJECT
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REAL TESTING, TO SHARE REAL DATA

Our testing is funded 100% by your purchases.

Don't fall for claims elsewhere that are too good to be true! Save money and get performance parts that actually MAKE A DIFFERENCE!

HYDRAULIC BRAKE DYNO. NOT INERTIA! Allows us to find weak points and make precise engine improvements.
USA-MACHINED BIG POWER BUILT ENGINES
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175CC, 184CC, OR 187CC SCREAMERS!


Quotes from some GY6 engine builders will make you crap your pants. Our unique R&D nails reliability and POWER without adding BIG INFLATED COSTS.

· Affordable GY6 175cc big bore crate engines
· Custom GY6 hi-comp stroker pistons (up to 190cc)
RELIABLE POWER BUILDS UP TO 187CC
R&D DONE RIGHT
189961e2-608e-47fc-ad6c-e811635f1b45.jpg
GOING STROKER? YOU NEED THIS PISTON

Made specifically for +2.5mm or +3mm stroker builds.

Our GY6 stroker pistons RESOLVE the common causes of engine failure when using stroker crankshafts.

Designed and machined right here in the BDX SPEEDSHOP! Use one to stroke your engine up to 187cc without janky unreliable cylinder spacers!
HOMEGROWN AMERICAN WORK
AND INGENUITY
a04f840f-2f1b-4553-b547-31c5640f8baf.jpg
UPGRADES MADE IN USA - BUILT IN USA

Where do cheaper China parts outfits send your money?

We put your funds to work right here in the USA making these machines faster and stronger!
Thank you for your business!
JOIN OUR ADVICE FORUM!
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GET ANSWERS YOU NEED

Don't spend more than you need to fix or upgrade your machine. Get accurate advice that will save you money and hassle. Read the rules, and join the conversation!
WARRANTY
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Phone: 434-446-1864
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Phone #2: 434-447-4870

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