O.S. 25XZ (P) Competition Truggy Engine (Turbo Plug)

This item is discontinued and no longer available for purchase. You may want to search our site for a similar item.
Low Price: $329.99
Discontinued Online

This is the O.S. 25XZ (P) Truggy Engine. O.S. has now built an engine that utilizes the best balance of power, economy and weight that stays well below the max legal ROAR displacement regulations. Power alone will not put you on the podium. You need an engine that allows you to stay on the track while your competition is making pit stops. You need a low center of gravity that helps keep your chassis planted in the turns. You need smooth power delivery at any point in the engines RPM range. The O.S. 25XZ delivers all of that, and more! Like all large displacement engines, the 25XZ produces all the power you need, but what sets it apart from the competition is its ability to deliver gobs of power, with a low center of gravity, at the same time giving you the mileage you expect from a modern engine.  

This engine includes the OS21J, 3 Needle Slide Carburetor for easy and reliable tuning, a P3 Turbo glow plug, 8mm carburetor reducer, exhaust gasket and Dust Caps for the carb throat, carb nipple and exhaust.


  • Premium power for owning the winnerís circle at 1/8 scale off-road events!
  • More muscle than a .21 ó more compact than a .28.
  • Lower center of gravity aids in handling.
  • A 21J double-adjustable carb ensures smooth acceleration at any speed.
  • 10-fin blue anodized cooling head reduces heat.

Displacement: 0.25 cu in (4.1cc)
Output: 3.1 hp @ 33,000 RPM
Bore: 0.689 in (17.5 mm)
Stroke: 0.669 in (17 mm)
Practical RPM: 4,000-39,000
Weight: 13.1 oz (370g)

This product was added to our catalog on March 11, 2010.

martin lenneville
Saturday, Jul 30 2011 (about 6 years ago)
O.S. 25XZ (P) Competition Truggy Engine (Turbo Plug)
really nice engine for the price, easy to tune and good run time for big block.i run losi 2.0T and the best engine for truggy,good power i dont need to mod for good power)
DeShaun Dash
Tuesday, Mar 23 2010 (about 7 years ago)
O.S. 25XZ (P) Competition Truggy Engine (Turbo Plug)
Very strong engine Made the A main at the Gt world championship with this in my inferno gt2 the rpm is very nice I was able to pass on the the straight with ease. The power band is smooth and the fuel milage was good homestead rc raceway is a pretty large track. This is a Good engine get one.)
Truggy Fan
Verified Owner
Sunday, Jan 13 2013 (about 4 years ago)
O.S. 25XZ (P) Competition Truggy Engine (Turbo Plug)
A decent engine, but needs to be lean to be mean. Took it out of my truggy and threw it in a buggy with an 086...oh my.)
Sunday, Jan 26 2014 (about 3 years ago)
O.S. 25XZ (P) Competition Truggy Engine (Turbo Plug)
wow. I dont know what some of these reviewers are doing to/with their engines, but its wrong whatever it is. This engine is STRONG., you will need first class trigger control in a race because you will easy pass others on the straights. i get 8 1/2 runtime. OS quality. get it.)
tommy rivera
Verified Owner
Friday, May 14 2010 (about 7 years ago)
O.S. 25XZ (P) Competition Truggy Engine (Turbo Plug)
very nice motor , easy to break in tons of power not recommended for trigger happy racers)
boyd ompang
Wednesday, May 12 2010 (about 7 years ago)
O.S. 25XZ (P) Competition Truggy Engine (Turbo Plug)
to much money for this engine..you can buy a nice engine like novarossi fms or the p5)