May 25, 2022
Japan Land Engine Manufacturers Association
Revision of Phase 3 Voluntary Emission Regulations for Small Non-Road Spark Ignition
Engines
The Japan Land Engine Manufacturers Association (hereinafter, LEMA) implements
voluntary exhaust gas regulations to reduce hydrocarbons (HC), nitrogen oxides (NOX), andcarbon monoxide (CO) in the emissions of small non-road spark ignition engines (hereinafter,SI engines) with an output of less than 19 kW that are manufactured by member companies
and sold for use in the Japanese domestic market.
These voluntary exhaust gas regulations apply to SI engines installed in tillers, generators,
chain saws, brush cutters, etc., and the Phase 1 regulations were implemented in January 2003,
the Phase 2 regulations in January 2008, and the Phase 3 regulations in January 2014 in stages
by category (for portable and non-portable equipment) and class, with the Phase 3 regulations
being applied to all categories since 2016.
The voluntary emission control regulations in Japan were introduced with a view to future
global mutual certification and with the desire for regulations to become a global standard, on
the premise of harmonization with the EPA (U.S. Environmental Protection Agency
hereinafter abbreviated) regulations, which have been progressing internationally, and havebeen harmonized with European regulations as well. Member companies of LEMA are actively
working to reduce emissions from SI engines in response to European and U.S. regulationsand voluntary regulations, and have now revised LEMA voluntary regulations in order to
respond to the globalization of the domestic market and achieve further results.
1) Background of the revision of voluntary emission regulations
Since its inception, LEMA voluntary exhaust gas regulations have been applied to enginesmanufactured by member engine manufacturers, however due to recent globalization, manyengines manufactured by non-member foreign manufacturers are now being sold in thedomestic consumer market.
In response to this situation, and from the standpoint of environmental conservation, we
have revised the Voluntary regulations to expand the scope of applicable businesses so thatbusinesses using engines manufactured by foreign manufacturers can also participate in thevoluntary regulations and make efforts to reduce emissions.
2) Scope of application and detail of revision
The engines subject to this voluntary emission regulation are now defined as "new SI engines

with output of less than 19 kW manufactured by member companies at their domestic plants
in Japan or overseas plants or or supplied by non-member companies and sold for use inJapan." and engines supplied by non-member companies are also included in the scope. In
addition to the existing “engine manufacturers”, the regulations now also apply to "engine
dealers," "engine equipment manufacturers," and "engine equipment dealers" who aremembers of the association.
3) Targets and detail of Phase 3 voluntary emission regulations(1) The target engines are the SI engines with an output of less than 19 kW as mentioned
above (excluding engines for emergency, emergency use and racing engines etc.), and engines
supplied by non-member companies will also be added to the list.
Regulatory emissions are HC+ NOX and CO.
(2) Phase 3 Voluntary Emission Limits
There will be no changes in emission limits. The emission limits and their implementation
dates are as follows:EngineDisplacement

Phase 3 voluntaryClass(cc)emission limits (g/kW-hr)
HC+NOxCOApplied fromⅠ

Less than 225

10.0610January 1, 2016

ⅡAt or above 225

8.0610January 1, 2015

Handheld

Ⅲ

Less than 2050805

engines

ⅣAt or above 2050805

72603

Non-handheld
engines
(NHM)

(HH)

and less than 50
Ⅴ

At or above 50

Regulation method

January 1, 2014

In-use regulations (Note 1)

Note 1: In-use regulations refer to the requirement that voluntary emission limits must be
met within a predetermined cumulative operating time.
4) Operation of Phase 3 voluntary emission regulations
Member companies shall notify LEMA in advance of the specifications and emission valuesof the engines that they intend to sell for use in Japan. In addition, the member companies
shall calculate the actual emission values of the subject engines manufactured, and supplied
by non-member companies during the relevant year (January to December) and report themto LEMA.

Based on the performance reports submitted by each member company, the total emission
volume is calculated and the average emissions volume per engine is calculated and compiled
for publication by LEMA. This will maintain the results and transparency of voluntary
regulation.
5)Implementation
This revision of the voluntary emission regulations will take effect on May 25, 2022.