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GY6 Engine, 155cc

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 item has an extended timeframe before shipping. Our custom products are made in-house in small batches as we get enough orders on a revolving basis.

If you order today, this item may ship roughly around June 25, 2019 based on our best estimates. However this ETA is subject to change at any point before or after sale. By ordering you agree that there is no promised shipping timeframe, and you are willing to wait for enough other orders to arrive to fund a production run.


READ OUR SHIPPING POLICY
READ OUR RETURN POLICY


Important! Read this listing fully


We don't accept returns on engines, so read this listing entirely! All frequently asked questions are answered here. If you have any additional questions please let us know before ordering.


Does your model have internal reverse?


This engine will work, but if you have an internal reverse engine, you will need a compatibility kit. Contact us for more information *before* ordering.


Built to HOWHIT Specifications, plus extras.

155cc Engine Size
Read our article on how displacement relates to more power.
How Big Bore Kits & Strokers Work | GY6 Displacement Calculator

Large Valves (27/24)
The large valves allow the engine to breathe much better at full speed. Much improved power on the top end, giving higher top speeds. This is a radical improvement if your original engine came with the small 24/23 valves.

Large Valves, Higher Top-End PowerLarge Valves, Higher Top-End Power

Stator Upgrade (8-Pole)
The 8-pole stator generates more electrical power for extra lights and charging the battery faster.

Stator Upgrade IncludedStator Upgrade Included

Kick-Start Internals
Depending on which frame you have, you may be able to use the kickstart internals installed on this engine if there is enough frame clearance. Ask us about our kickstart retrofit kit which comes with the muffler mount and kickstart lever needed to make this function.

Other Differences
Our engines come with debris blocker on the inlet of the CVT, instead of the original boot shown in the picture. The original boot wasn't designed for dusty conditions and clogs quickly. This has (in our experience in speaking with many owners) lead to prematurely failed clutches and flat spotted rollers due to heat build up. Also, this engine does come with an intake inlet manifold, although none is shown in the picture.

Improved Debris Blocker installedImproved Debris Blocker installedIntake Manifold Inlet includedIntake Manifold Inlet included

If you have reverse: This engine comes with the short transmission shaft common on Yerf Dog and Crossfire 150s. If you have reverse you'll need to install the Reverse Output Shaft into the transmission. You could use the shaft from your original engine or buy a new one Reverse Shaft.

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

This engine will fit nearly every buggy and ATV that already has a GY6 engine installed. This will replace SUNL and ROKETA engines as well.

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.

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.

Nothing more comes with the engine than what makes it a fully assembled self-contained unit with no oil leaks or covers missing, etc. Carburetor, exhaust, ignition, and related pats are not part of the self-contained engine unit and are not included. Each of these are available separately.

Remember to adjust valves after break-in period.

IMPORTANT INFO

  • Complete Engine & Transmission

  • 58.5mm Big Bore (+1.1mm)

  • 8-pole stator

  • Large Valves (27/24)

  • Short Output Shaft

  • Internal reverse karts must use support kit

  • Item #359

SUPPORT VENDORS WHO
SUPPORT THE SPORT!

Your order helps fund future upgrades!

T@BD BUILT DIGITAL GY6 DYNO PROJECT
05df710b-4a38-45dd-af1a-e96bf5d289d9.jpg
REAL TESTING, TO SHARE REAL DATA

This project is funded 100% by your purchases.

Can you tell a good upgrade from snake oil? We'll test the parts and share the data, you decide!

HYDRAULIC BRAKE DYNO. NOT INERTIA! Allows us to find weak points and make precise engine improvements.
AFFORDABLE SINGLE CYLINDER FUEL INJECTION PROJECT
fac6ade1-aac3-4260-8686-2000e553547f.jpg
KICK THE CARB!

Forget $400+ EFI Kits.

Developed right here in the USA by our owner! Finally, an EFI system that won't break the bank, with modern features way beyond the outdated and expensive kits from China.

- Wireless WiFi tuner BUILT IN! No cables or funky adapters from the 1980's.
- Tune with any device! Mobile, laptop, or desktop!
BUDGET-FRIENDLY BIG GY6 ENGINES
189961e2-608e-47fc-ad6c-e811635f1b45.jpg
GO FASTER, and SAVE MONEY


Quotes from some GY6 engine builders will make you crap your pants. Our R&D nails reliability without adding big costs.

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

Made specifically for +2.2mm or +3mm stroker builds.

Our STR220 and STR300 GY6 stroker pistons RESOLVE the common causes of engine failure when using stroker crankshafts.

Machined right here in our shop. Use one to stroke your engine up to 190cc maximum 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!
8abd4b99-176f-40fe-9e72-3eda008842dd.jpg
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

Engine 60-day Limited Warranty

This engine comes with a 60 day warranty on parts. Any labor costs for installation or repair are not covered. This warranty covers parts only.

Conditions
The engine must be installed and repaired by someone of sound mechanical competence.

Exclusions
Expendable maintenance items are not covered, and include but are not limited to: drive belts, drive clutches, brake pads/shoes, vacuum or fuel lines, spark plug.

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