Ss-worldwide Motorcycle Accessories User Manual download pdf (Page 14)

. Reassemble gas tanks and all other parts that were

dissembled during preparation for top end service. Be

sure there are no gasoline leaks and that throttle opens

and closes smoothly and snaps shut when released.

NOTES:

● Throttle must not bind and must snap shut to fully closed

osition when released.

● Fuel needle and seat assembly must completely shut off fuel

supply entering bowl. Fuel line connections must not leak.

Unwarranted gasoline leaking by fuel inlet needle may flood

engine causing damage to components.

● If throttle does not return to fully closed position when

released, it may inadvertently stick open possibly causing loss

of control of motorcycle and personal injury to you or others.

● Unwarranted gasoline leaks at fuel line connections and/or

past inlet needle may flood engine and overflow on

surrounding area creating fire hazard.

14. Engine Break-In Procedure

A. Upon initial start-up, quickly check to make sure oil

pressure is normal and no leaks exist. With minimal load

on engine, ride motorcycle at low speeds until cylinder

head temperature reaches about 250°. Do not crack

throttle or subject engine to any heavy load during this

period as head gaskets are susceptible to failure until

heat build-up is completed. Heat build-up is necessary

to cause heads and cylinders to expand and seal.

Improper initial engine start-up and break-in procedure

may cause head gasket failure.

NOTE: Proper first time engine start-up and break-in is critical to

achieve permanent and lasting head gasket seal. Prior to initial

star

t-up, a .001" to .005" feeler gauge will fit between head

gasket and head and cylinder gasket surfaces stopping at fire ring

on head gasket. Warming engine as instructed will tightly close

this gap producing a good, lasting seal.

Do not allow engine temperatur

e to become excessive as

permanent engine damage may result.

First 50 miles ar

e most critical for new rings and piston

break-in. Most engine damage will initially occur during

this period. Keep heat down by not exceeding 2500

rpm. V

y speed. Do not lug engine.

C. Next 500 miles should be spent running engine no faster

than 3500 rpm or about 50-55 mph. Do not lug engine

and continue to vary speed.

Lugging or r

unning engine pr

ematurely at high rpm’s may

result in damage to pistons and/or other engine components.

S&S

voids its guarantee if engine is not broken in properly.

. For balance of first 1000 miles, speed can be run up to

60 to 70. Continue to run engine at all different speeds

including lower 40-45 mph ranges.

E. 1000 to 2000 miles—basically same procedures as

before. You can be a little more liberal with rpm range.

Avoid overheating engine and putting any hard strain

n engine (drag racing, trailer towing, sidecar

operation).

. 2000 miles and up—have fun!

15. Performance Notes

Ignition

● Ignition system type - Most S&S engines initially tested on

our dyno are equipped with an aftermarket high

performance electronic unit. These systems allow us to

bypass the performance parameters (such as the rpm

limiter) designed for stock parts and built in to the stock

ignition system.

● Spark plugs - Use spark plugs that are compatible with the

ignition system. If you are in doubt, most manufacturers can

recommend which plugs they prefer you use with their

system. Dual plug installations in S&S Super Stock

heads are

not necessary.

● Flywheels - S&S flywheels for Evolution

Sportster

models

have timing marks for front and rear cylinders. Both

flywheels have timing marks to accommodate both four

speed and five speed engines. The "F" mark is front cylinder

30° advanced (before TDC). The “R” mark is rear cylinder 30°

advanced. When "F" or "R" timing marks are located in the

center of the timing hole, the crankshaft is positioned 30°

before TDC for that cylinder. Placing the mark to the rear of

the hole, or just entering the hole, advances timing almost

5°. Conversely, if the mark is just leaving the hole, timing is

retarded almost 5°.

● Timing - Tests conducted using S&S Super Stock

heads and

modified stock Harley-Davidson

heads showed that best

performance was achieved with the ignition timing set

between 30-32° before TDC. We attribute this to the higher

compression ratios generally used, improved flow

characteristics and improved overall efficiency. If using stock

heads, the higher the compr

ession ratio less advance is

generally needed. Lower compression engines may r

equire

more advance. Some experimentation may be required to

determine the best timing setting for best performance.

Once the engine is timed and operating, monitor it for

excessive heat. Too much heat can mean that timing is set

incorrectly and should be adjusted to prevent engine

damage.

Impr

oper ignition timing may cause excessive engine heat

which may damage pistons and/or other engine components.

CAUTION

WARNING

CAUTION

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Ss-worldwide Motorcycle Accessories User Manual Page 14

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