Honda GX 160 Technical Regulations

Honda GX 160 Technical
the components used but also to the number used and the manner in which the engines
are assembled. Please remember that save for the changes specifi cally mentioned in these
regulations the engines must be completely standard unmodifi ed, and that all components will
remain in place unless this document specifi cally states that they are allowed to be removed.
No specifi c coating procedures are allowed on any internal or external surface of the engine.
Carbon or gasket residue removal must be achieved by use of chemical agents only, to
preserve original fi nishes. The fasteners on the engines may be drilled for the purposes of
lock wiring. Replacement of external fasteners with non-Honda fasteners is only permitted
when the replacement fastener improves safety or when the standard Honda fastener is not
readily available. A thread recovery procedure is acceptable providing that the system and
replacement fi xing used are of no different size or pitch to the original and therefore offer no
mechanical advantage over the original fi xing.
DEFINITIONS
The standard, unmodifi ed component
This means that the component has not had its substance altered in any way. It has had
no material removed from it or added to it. It will be of the same, original material. Where
appropriate, it should have the manufacturer's original manufacturing process or machining
marks on it.
Engine types
The original QHQ4 engine, to engine number 7664037, shall in this document be called the K
engine. The QHQ4 engine from engine number 7664037 onwards shall in this document be
called the E engine. The QHQ4 engine with suffi x T, from engine number 1000000 onwards
shall in this document be called the T engine. This will also include all unifi ed specifi cation
engines (GX160UT1 QHQ4), and the QHG4.
Legality limit
In general terms, and where not clarifi ed or qualifi ed elsewhere in this document, the legal
limit for eligibility purposes shall be deemed to be the service limit as specifi ed by Honda in the
most up-to-date Honda Service manual for the particular engine. (http://www.honda-engines-
eu.com/en/welcome.html)
Honda GX160 technical regulations
GENERAL
The scrutineer will pay special attention to ensure that the
fi nish of all components match those of the standard unit and
reserves the right to compare any part from competitors' engines
directly with a standard part as supplied by Honda (UK). Unless
competitors have gone out of their way to source alternative parts,
their engines should automatically comply with this rule. Furthermore,
competitors should note that the term "standard" refers not only to
Version 4
Regulations
January 2009 Page 1 of 5