175cc Big Bore Conversion & Rebuild Service For Your 150cc Engine (Buggy, ATV, Scooter)

In stock
$599.00

175cc BASE BUILD OVERHAUL SERVICE

175cc · BORED · WARRANTIED
Send your engine to us; we will rebuild your worn out 150cc and turn it into a kickin' 175cc!  Our 175cc night and day difference in power over what you're used to getting out of your old 150. Want to know how it works on the inside? Read our very detailed article on the advantages of big bore builds.
Before sending your engine in to be rebuilt, you must thoroughly clean the engine and drain all oil. Failure to clean your engine will result in a $250 charge.

This listing is for services provided by BDX Performance. You must send in your engine for work to be done. We will prep and install the 175 package.  
Your engine will be returned to you as renewed 175cc, fully tested and ready to bolt in. With this rebuild you get the following:
  • New 62 mm big bore kit (cylinder, piston and rings).
  • New standard clutch
  • New clutch spring
  • New variator
  • New 12 gram roller weights installed
  • New CVT belt
  • Refurbished head
  • New Oil pump
  • New Oil pump chain
  • New Gaskets
  • New Cam shaft
  • New Timing Chain
  • New Starter Clutch
  • New Starter
  • Inspection to see what other parts need to be replaced.

Other Performance Options:  We will also install other performance parts not listed here if you purchase them at the same time as this service:
  • New high stall clutch
  • New 1500 RPM yellow clutch spring
  • New 115mm Performance Variator
  • Three additional sets of roller weights 9g, 12g, 14g.

175cc Power vs 150cc Power

DON'T HAVE ENOUGH POWER?
Unlike others, this setup will last you MORE than just a couple season. When taken care of with proper filtration and lubrication, you can expect our builds to last as long or longer than stock. This build is rock solid on reliability and BACKED UP WITH OUR 3 MONTH WARRANTY.

Premium USA Boring and Machining

We bore your case IN VIRGINIA, USA in order install the 62mm big bore cylinder and kit.





Our borework is done on 4,500 pound machinery built for precision. The end result is a center bore far better than stock. We hold a tight consistent tolerance to the outer wall of the 62mm cylinder sleeve. This contributes significantly to long-term reliability.

THE BDX SPEED SHOP

We carry our own brand. Others can't do the math and don't understand the underlying design priciples. If you see a builder riding the coat tails of overseas companies and throwing a bunch of brand names in your face to sell their work, watch your wallet! We cut out the middle man and provide badass purpose-driven builds for far less.

BUILT WITH PRIDE IN THE USA


Every BDX build begins by doing the math right from the very start. Firmly understanding how turn the optimal numbers into physical parts, we use these calculations to inform and direct development of the final pieces. This allows us get bigger and more dependable results for a smaller asking price.

CHEAP BUILDS AIN'T CHEAP!

THINKING OF DIY?
OR DEALING WITH A BACKYARD BUILDER?

1. How many times can you afford to rebuild in order to get it right? or "right enough"
2. How much downtime will you have sending your engine back and forth to your "builder"?

Think you can avoid hassle by using a "no machining" big bore kit?

THINK AGAIN!








We've been there and done all of that, and have paid for our share of R&D so you don't have to.

Do it right the first time!

TRANSMISSION SPECS
Variator Standard
Clutch Standard
CVT Action 12g Rollers x 1500rpm Spring
Final Gear Standard
CARE SUMMARY
Crankcase Oil 800ml 10w40
Gear Oil 125ml 80w90
FILTRATION
Use a genuine UNI FILTER only. No K&N filters, No cheap Chinese foam filters. Absolutely no stock filters.
BREAK IN
Break-in information is in our 175cc manual. Download it here.

Adjusting valve lash is not required and not recommended during or after break-in.


HOW THIS SERVICE WORKS

  1. Order from this web-page.
  2. We will email the mailing information with the order confirmation/receipt. (Look towards the bottom of the confirmation email)
  3. Remove your engine, DRAIN OILS, and clean debris from your engine.
  4. Send us the engine, and we'll take care of it from there!

EVERYTHING INCLUDED AT THIS PRICE

  • BDX MACHINE BOREWORK MACHINING AND PREP
  • BDX INSPECTION AND PROFESSIONAL ASSEMBLY
  • BDX FULL TEST ROUTINE BEFORE SHIPPING
  • BDX 62mm Big Bore Cylinder Kit
    • BDX-Spec 62mm Cylinder Body w/ Thick-wall Sleeve
    • 62mm Piston
    • Piston Rings
    • Wrist Pin & Clips
  • New 57.8mm Crankshaft & Crank Bearings
  • 175 Optimized CVT
    • CVT: S1 Rollers
    • CVT: S1 Spring
  • New Standard Camshaft
  • Cylinder head rebuild
    • New valves
    • New seals
    • New springs
  • New timing chain
  • New timing chain guides
  • New oil pump
  • New oil pump chain
  • New drive belt
  • New clutch bell
  • New final transmission bearings as applicable
  • New seals and gaskets (excluding reverse)

 

Sold Separately:

Please note: We will also install other performance parts not listed here if you purchase them from us at the same time as this service.


Every BDX Speed Shop engine build is covered under warranty.

Other "builders" try to slide out from under their own work and avoid warranty by telling you "race engines" aren't covered. That's some BS.

BDX 3-Month Limited Parts Warranty

The new components of your engine are warrantied for 3 months (90 days) from the date of delivery. The warranty covers issues with the parts that arise due to defects in material or factory workmanship.

Conditions and exclusions:

IMPORTANT! You must use a genuine UNI Air Filter as a condition of this warranty.

-If the engine is run for any period of time without an air filter, the warranty will be terminated.
-If the engine is run for any period of time without proper lubrication, the warranty will be terminated.
-Belts, CVT weights, and clutches are not covered under warranty.

BDX Performance does not accept returns or refunds on engine builds under any circumstances.

Question: Can I modify my engine without voiding the warranty?
No. Each component was chosen to match with other parts of the build. Changing parts of this build will most likely reduce performance, or cause damage. If you're going to do it anyway and sacrifice your warranty, contact us before modifying the engine for advice.

Warranty Procedure
If you think a component should be covered under warranty, please contact us online and submit a warranty request.

IMPORTANT! Buggy Depot does not operate through 3rd party repair shops, thus under no circumstance shall Buggy Depot be liable for service costs by any 3rd party shop or service provider.

STANDING BEHIND OUR WORK

Issues are going to happen anywhere.
Read what people say about us.
"The short version of my story is that my 1 year old upgraded performance engine with less than 10 hours of use began to have serious oil leak issues... I reached out to BD and eventually connected with Travis to explain my dilemma via e-mail as that is the approach. I halfway expected the reply to be "we are really sorry but your engine is beyond the warranty period, so best of luck to you". Instead, Travis and I had a real discussion about some of the issues my engine was having... he agreed to pay for the entire cost of shipping and repairing my GY6 engine...

I just want to let others know that contacting BD via the methods defined on the website certainly does work and that you will get the help you have come to expect from the folks at BD. ... be calm and patient as the folks at BD work to make things right so they can continue to be a valued business to all of us. Well Done BD and Travis!!"
- William J. (175cc Engine Build) Read the full review

William's engine was 10-months past a 2-month warranty. However, it was clear that the original error was on our end. If you have a legitimate problem, we'll make the situation right. When others would give excuses and hang you on technicalities.

 

You can convert your GY6 ATV, UTV, buggy, go kart, scooter, 150CC GY6 engine into a true 175cc engine. We are doing some major upgrades to our engine listings. While we are in the process of upgrading and enhancing these listings please see our other listing on the 175cc engine to see all of the benefits of this engine

Racing Engine
Our Buggy Depot 175, 184cc performance engines are for off-road racing purposes only.

Reviews