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OBR Full Mod Twin 50.8cc

Part #: 2550

Price: $1,649.00

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OBR-Oneill Brothers Racing Twin 50.8cc engine for your HPI Baja 5b, 5t, 5sc or SS.




This is a special order item, **No coupon codes allowed** customers must first email TGN for availability and shipping costs at sales@TGNdistributing.com.

First, we want to thank all of our business partners and manufacturers for making this possible. We couldn't have done this without you. We would like to thank Dave from Turtle Racing, for the countless months, hours, and time that you spent helping us with the engine mounts; Dino from Jetpro, for developing the pipes that run so well on this engine.

A week before hpibajaforum.com's 2010 Dunetoberfest, we came up with the idea to build the 50.8cc twin engine. We had just recently received a shipment of water cooled twin engines. At O'Neill Brothers Racing, our passion is building high performance engines and we are always thinking of new ideas and ways to get better. After seeing that the bolt pattern on the clutch side of the engine was the same on the water cooled twin, that got our wheels turning. Joe, Dan and Sean dropped what they were doing and went to work on getting this engine into a baja. With only having about a week on the first build, we barely pulled it off in time to bring it out to Dunetoberfest. After watching the first run in the sand, we were hooked and have been working nonstop on this engine ever since.

Now lets talk about the engine. The bottom end is a brand new RCMK V2 S-520. This was our first choice due to the one piece crankshaft and the fact that this bottom end utilizes both needle and sealed crankcase bearings. We have installed two fully ported Zenoah G270RC 4 bolt 25.4cc top ends on this engine. This engine comes with two Wt-929 carbs, which can be upgraded to Wt-603's during checkout. This engine is setup for 91 octane pump gas. We solved the heating issue with the heat sink shown in the pictures, compression and custom modified pistons.

What Comes in the Kit?

1x Fully Ported 50.8cc Inline Twin Engine with carbs and billet Heat Sink;
1x Turtle Racing Mounting Kit: Pull start/coil plate, engine cradel mount (mounts engine to rear chassis plate, rear bulkhead, main chassis), tranny plate, one piece brake mount, 2x air boxs, billet clutch housing and chassis mount;
1x Steel Layshaft;
2x Jetpro v.2 Twin Pipes;
2x TGN Easy Clearance Filters;
1x Team Twisted RC Twin Throttle Linkage;

A Team Chase cage is recommended for both the V1 and V2 pipes. The V2 pipes will allow for all of the side mounting to be used. The overall volume of the new pipes are the same as a V3 baja pipe which will allow for more rpms. 

Recommended Upgrades:
Turtle Racing Clutch System;
Turtle Racing Quick Diff;
DarkSoul Dog Bones and Tubes drive system
Hostile Racing Products Zero Growth Foams and Tires;
Steel Gears;
RCR Brakes


See the Close Up profile that LSN did on Keith's Twin 5t. CLICK HERE!

Videos of the twin kit in action:

First prototype built for 2010 hpibajaforum.com Dunetoberfest 

Production Kit


Dumont Dunes 

World Famous Phat Track

Great Test Video

OBRA TGN EXCLUSIVE—At Oneill Brothers Racing we specialize in reliable/affordable high performance engines and upgrade kits for your large scale rc car. All of our porting and machining is done in-house.
This item fits: Baja 5b, 5t, and 5sc

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