Ultima SHOVELHEAD ENGINES Spezifikationen PDF herunterladen (Seite 17)

Carburetors and Initial Tuning

Ultima Shovelhead engines are not supplied with a carburetor or intake manifold. It is the responsibility of the original purchaser to choose

the best carburetor for their riding needs. It is also the responsibility of the original purchaser to insure that their carburetor is properly tuned.

Typically higher elevations or hotter climates will require different jetting and ignition timing than those shown in this guideline. At any

elevation it is important that your initial tune is not excessively rich, which is indicated by excessive black smoke, and equally important, avoid

running the engine lean for the initial break in as this condition creates heat fast. Prior to starting your engine you should check your

carburetor’s initial idle mixture setting and fuel pump setting recommended by the manufacturer. Ultima

provides the proper base line jetting

for typical carburetors that will be used, but idle mixture and fuel pump settings must be done on an individual basis. When selecting the

initial jetting for your engine remember that exhaust systems and ignition settings can have a great effect on the engine’s fuel demands.

An experienced tuner should make the final decision for your particular jetting and timing needs with your combination and at your elevation.

Thoroughly read and understand your carburetor instructions before installing it or starting your engine.

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 the Ultima Shovelhead 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. Follow your plug manufacturer’s recommendations for proper plug gap.

12mm Cold Plug 12mm Colder Plug

Champion RA8HC RA6HC

Autolite 4164 4162

NGK DCPR7E DCPR8E

Accel 882 742

Ultima Shovelhead engines

are supplied with Champion

RA6HC spark plugs installed

and gapped at .035”.

Baseline Jetting Suggestions

Mikuni 42mm 160/22.5

S&S ‘E’ 76/31

S&S ‘G’ 74/29.5

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