TRX 2.5R
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3
Before You Proceed
Carefully read and follow all instructions in this and any accompanying materials to prevent
serious damage to your engine. Failure to follow these instructions will be considered abuse
and/or neglect. Before running your TRX 2.5R Racing Engine, look over this entire manual and
examine it carefully. If for some reason you decide the TRX 2.5R is not what you wanted, do
not continue any further.
Your hobby dealer absolutely cannot accept a TRX 2.5R for return
or exchange after it has been run.
Warnings, hints, and cross-references
Throughout this manual, you’ll notice warnings and helpful hints, identified by the icons
below. Be sure to read them!
An important warning about personal safety or avoiding damage
to your TRX 2.5R Racing Engine and related components.
Special advice from Traxxas to make things easier and more fun.
Refers you to a page with a related topic.
Support
If you have any questions about your TRX 2.5R Racing Engine or its operation, call the Traxxas
Technical Support line toll-free at: 1-888-TRAXXAS (1-888-872-9927)
Technical support is available Monday through Friday from 8:30am to 9:00pm Central time.
Technical assistance is also available at www.Traxxas.com. You may also e-mail customer
support with your question at support@Traxxas.com. Join thousands of Traxxas R/C
enthusiasts in our online community at www.Traxxas.com.
Traxxas offers a full-service, on-site repair facility to handle any of your Traxxas service needs.
Maintenance and replacement parts may be purchased directly from Traxxas, or you can save
shipping and handling costs by purchasing them from your local hobby dealer.
4 Safety Precautions
5 Introduction
6 TRX 2.5R Racing
Engine Illustrated
7 Terms to Know
11 The Fuel
13 The Air Filter
14 The Carburetor
18 Breaking-in Your
TRX 2.5R Racing
Engine
22 Tuning the TRX
2.5R for Best
Performance
27 Troubleshooting
Your TRX 2.5R
Racing Engine
30 Maintaining and
Storing Your TRX
2.5R Racing Engine
33 Index
34 Rebuilding the TRX
2.5R Racing Engine
BEFORE YOU PROCEED
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