Honda GX 160 Technical Regulations

Honda GX 160 Technical
mentioned in these regulations the engines must be completely standard unmodified, and that all
components will remain in place unless this document specifically states that they are allowed to
be removed. No specific 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 finishes, which must be apparent over the complete machined area (see Appendix
2). 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 fixing used are of no different
size or pitch to the original and therefore offer no mechanical advantage over the original fixing,
or alter the position of the original fixing.
2. DEFINITIONS
2a. The standard, unmodified 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. It is
the component defined as being applicable to the particular engine type.
2b. 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 suffix T, from engine number 1000000 onwards shall
in this document be called the T engine. This will also include all unified specification engines
(GX160UT1 QHQ4 and QHG4). GX160UT2 QHQ4 and GX160RT2-QHG4 engines (T2) will be
eligible, with exceptions as notified in the following document.
2c. Legality limit
In general terms, and where not clarified or qualified elsewhere in this document, the legal limit
for eligibility purposes shall be deemed to be the service limit as specified 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
1. GENERAL
The scrutineer will pay special attention to ensure that the
finish 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 the components used but also to the number
used, their position and function and the manner in which the engines
are assembled. Please remember that save for the changes specifically
shaded area denotes text amended from previous version
Version 10A
Regulations
April 2015 Page 1 of 10