Honda GX 160 Technical Regulations page 2

COMPONENT BY COMPONENT
The fuel tank
It is strongly urged that the engine's integral fuel tank be removed. If this is done then the engine
must be fitted with a suitable cover. A standard floor mounted fuel tank should then be used,
unmodified and this tank and its mounting must be in accordance with chassis manufacturer's
instructions or homologation. The capacity of this tank must not exceed 7.5 litres. Ballast may
be added to the tank in order to maintain the maximum capacity. In this instance the kart may
be fitted with a pulsed fuel pump(s), which will take a vacuum feed from either the governor
rod hole or one drilled in the inlet manifold, tapped to accept a vacuum fitting. Fuel pipes must
take a direct route to the carburettor and be safely secured. An extra loop of fuel pipe may be
used as a return feed to the tank. One in-line fuel filter of nominal capacity per engine may be
fitted.
Exhaust
The standard exhaust must be used but a unit modified and sealed by Prokart Engineering
may also be used. In this case, the unit will bear a seal applied by Prokart Engineering and
it is the competitor's responsibility to ensure this seal is in place at all times. At any time the
modified unit on the engine can be exchanged with one held by the scrutineer, who will then
send the competitor's exhaust back to Prokart Engineering for inspection. If this unit is found
to have been tampered with in any way, then the competitor will be penalised retrospectively.
No other repair or modification is allowed. Prokart Engineering can be contacted at 0132 928
9783 or www.prokart.co.uk. Exhaust, Part No 18310-ZH7-V90 can also be used, and modified
as above.
Carburettor
There is no restriction to the use of standard, unmodified A, B or C type carburettors with
any of the engine types. However all carburettors are subject to normal dimensional criteria.
Overall length (manifold face to airbox face) is 54mm and bore go / no go gauge is 13.2mm /
13.3mm.
Permitted main jets
size 68 (PN 99101-ZF5-0680)
size 72 (PN 99101 -ZF5-0720)
Emulsion tube can be either part number 16166-ZH8-W50 or part number 16166-ZH-810 (see
drawing 1 in Appendix 1). The throttle-actuating arm can be modified to accept an actuating
rod onto the throttle butterfly, a method of mounting a throttle actuating cable and a method of
mounting a throttle return spring only.
Carburettor air box
Must be standard unmodified.
Air filter
Substitution or complete removal of the renewable paper/foam air filter is allowed, although the
plastic outer cover must remain as standard unmodified and in place.
Spark plugs
Spark plugs fitted to the engines must be from the recommended list provided by Honda -
please see below. No other spark plugs may be used. The plugs used must not be modified in
any way whatsoever and must have a reach identical to that of the plugs listed. Resistor plugs
will be used. The standard Honda resistor spark plug cap - as supplied with the engine - must
be used.
Honda GX160 technical regulations
size 70 (PN 99101-ZF5-0700)
size 75 (PN 99101 -ZF5-0750)
Version 4 January 2009 Page 2 of 5