Rev Limiters
During break-in we suggest setting Rev Limiters to the lowest setting (5,500 or less) to insure over revving will not occur. Most Ultima
®
engines
will not produce power beyond 6,000 rpm and little if anything is gained by revving these engines past this rpm when in the stock
configuration.
A major contributor to a shortened engine life is high RPM.
Spark plugs Recommendations:
There are a variety of spark plug manufacturers who make the proper style and heat range plugs for these engines. While OEM H-D
®
plug heat
ranges will work perfect in most cases on our smaller engines, we recommend using a colder heat range plug on some 113 CI engines pulling
heavy loads and all 120, 127, 130 and 140 CI engines. Engines that have excessive spark knock may require a colder heat range and or richer
air/fuel mixtures and retard the timing. We also recommend using the coldest plug your combination/environment and fuel will allow for best
overall engine life and performance. Plugs that are too cold may foul easily under certain conditions and plugs that are too hot can cause spark
knock and detonation. Some popular manufacturers and heat ranges are listed below. Also consider that many manufacturers offer the same
heat range plug with a 13/16 hex or a 5/8 hex. If you prefer the 5/8 hex for example in a Champion RN11YC you need to change to a RC11YC for
this option. Follow your plug manufacturer’s recommendations for proper plug gap.
Ultima
®
Engine 130/140 113/120/127 113/120/127 80/96/100/107/113
12mm Colder Plug 14mm Colder Plug 14mm Mid Heat Plug 14 mm Hotter Plug
Champion RA8HC RN9YC RN11YC RN12YC
Autolite 4164 4263 4264 4265
NGK DCPR7E BPR6ES BPR6ES FR4*/BP5EA
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