Ss-worldwide Motorcycle Accessories User Manual download pdf (Page 3)

. Refer to

hart 1

o determine increase over stock engine

height for the kit to be installed. S&S

recommends .100"

minimum clearance between engine and frame. If

increased cylinder height of Sidewinder

kit will not leave

ufficient room, clearancing will be required. S&S cylinder

heads for Harley-Davidson

Sportster

models are .062"

taller than stock, so additional clearance will be required

if S&S heads are to be used.

NOTE: S&S recommends there be .100" minimum clearance

between engine and frame. Up to .060" or .070" may be

ground from rocker box cover in some areas for clearance. If

cover is ground, be careful not to break through since covers are

very thin.

Excessive material removed from rocker cover may damage

cover causing oil leaks.

Removing material from welds or frame tube may cause

structural damage and possible failure resulting in personal

injury or death. If frame must be modified, work should be

done by a professional frame shop.

C. After crankcases have been bored in Step 4, mock up

engine using Sidewinder cylinders. Place mocked up

engine in frame and determine if additional clearancing

will be needed to provide recommended .100" space

between engine and frame.

2. Crankcase Alignment

NOTE: Some crankcase base gasket surfaces on which cylinders

are positioned do not align properly. This usually occurs when

crankcase halves used are from different crankcase assemblies

and were not paired and machined together during

manufacture. It is recommended that crankcases be checked for

misalignment even if crankcase halves are correctly matched to

prevent potential oil leaks and other mechanical problems.

Mismatched gasket surfaces due to improperly aligned

crankcase halves may cause oil leaks.

A. Clean cases thoroughly and assemble both halves

without flywheels. Tighten all case bolts as in final

assembly

B. Place straight edge ruler across base gasket surface.

See

Pictur

e 1.

C. If crankcase halves are correctly aligned, proceed to

Step 3. If any misalignment exists got to Step D in

this section.

D. Remove cylinder studs and place masking tape over cam

and mainshaft bearings to keep chips out. Consult

Harley-Davidson

service manual for proper cylinder

stud r

emoval and installation pr

ocedur

es.

Be careful when removing studs so as not to damage threads

in cases. If heat is applied to case ar

ound stud to help loosen

threads, do not allow crankcase temperature to exceed 375° F

as this may destroy heat treatment of crankcase material.

E. Place cases squarely in mill. Base gasket surface must be

square with center line of crankshaft and 45° from

opposite cylinder base gasket surface. Machine gasket

surface taking minimum necessary to clean surface.

Repeat for other cylinder.

F. Reinstall cylinder studs. For engines under 96"(4

⁄8"

stroke) reinstall original studs. For engines of 96" or

larger install late big twin style studs. (See Step 3)

Consult Harley-Davidson

service manual for proper

stud installation procedure.

3. Cylinder Mounting Studs - 96" Engines and Larger only

NOTE: S&S Sidewinder kits for Evolution

Sportster

models of

96" (4

⁄8" stroke) or greater require the use of big twin cylinder

studs. This is due to the increased cylinder length in these kits.

A. Remove stock cylinder studs if this has not been done in

Step 2. Consult Harley-Davidson

ser

vice manual for

proper stud removal procedures.

Be careful when removing studs so as not to damage threads

in cases. If stud does not come out easily, carefully heat case

ound stud as heat may help loosen threads. Do not allow

crankcase temperature to exceed 375° F, as this may destroy

heat treatment of crankcase material.

B. Install late big twin male type studs, S&S 31-2321 or 31-

2323, or Harley-Davidson

part #16837-85C. Consult

Harley-Davidson

ser

vice manual for pr

oper installation

procedures.

CAUTION

WARNING

CAUTION

Picture 1

CAUTION

1 2 3 4 5 6 7 8 ... 15 16

Cycle, Inc 1

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Ss-worldwide Motorcycle Accessories User Manual Page 3

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