Instruction Manual

ManualsBrandsS&S Cycle ManualsFor motorcyclesConnecting Rods

Rod Side Play - Recommended rod side play is .015" to .035". If

on assembly, side play is found to be less than .015", surface

grind equal amounts off thrust faces on both sides of female

rod. The recommended bearing cage width is .008" to .020" less

than the female rod width. This must be checked if female rod

has been narrowed.

Rod to Rod Clearance - S&S

rods have been machined to fit

stroker flywheels up to and including 5" stroke without

additional rod to rod clearance. If a longer stroke is to be used,

this clearance must be checked and increased as necessary - .060"

clearance is recommended and must be removed from the point

of contact on the female rod. Remove only enough material to

obtain recommended clearance. Smooth blend all clearance

contours to avoid stress risers.

Roller Bearing Clearance - S&S rods for street applications have

been honed to .001-.0012" running clearance. These rods r

equire

a new engine break-in period of at least 2000 miles.

NOTE: If connecting rods are to be used in a racing application

where proper engine br

eak-in is not possible, rod bearing races

must be honed to provide a minimum of .0005" additional roller

bearing clearance. S&S can supply rod sets with racing clearance

on request at no additional charge.

SPECIFICATIONS AND RECOMMENDA

TIONS

Centerline Measurement - All S&S rod sets except 34-7800 and

34-7900 measure 7.440" from wristpin centerline to crankpin

centerline. This dimension is the same as that of stock big twin

rods from 1974 to pr

esent and stock Harley-Davidson

Ironhead

Sportster

model rods from 1957 to 1985. This is .030" less than

stock 1936 to 1973 big twin rods. S&S big twin rods can be used

in applications replacing earlier, longer stock rods with the most

noticeable effect being a drop in compression of about

⁄3 to

⁄2

point. Piston to piston and piston to flywheel clearances should

be checked.

Rod set 34-7800 measures 6.926" from centerline to centerline.

These rods are the same length as stock 1983 XR-1000

and

1986 and later Sportster

model rods. Rod set 34-7900

measures 7.113" from centerline to centerline and are a special

length designed exclusively for S&S four cam

Sidewinder

/stroker applications.

Wristpin Bushings - Connecting rods for Evolution

engines

are sized for .792" diameter wrist pins. Connecting rods for

pre-1984 engines are sized for .791" diameter wrist pins.

Refer to Chart 1 for part numbers, applications, and wrist pin

diameters. When the corr

ect style wristpin is used a running

clearance is .001".

NOTE: If connecting rods fit for Evolution

wristpins are used

with pre-1984 style wristpins, running clearance will be .002".

Our experience has been that this amount of clearance will not

cause problems, however correct clearance should provide better

engine life and less possibility of noise.

S&S racing connecting rods utilize a 0.892” diameter wristpin.

Refer to Chart 1 for applications and part numbers. To alter a

bushed S&S rod set to be used with S&S racing pistons which are

equipped with a 0.892” diameter wristpins, the wristpin

bushing must be pressed out, and a

⁄32” diameter hole drilled on

each side of the I-beam into the pin boss as close to parallel

with the I-beam as possible. See Figure 1. After these holes are

drilled, the wristpin hole of each rod must be honed to provide

0.001” running clearance.

Part #

Application

Rod Wrist Pin Bearing

Length Diameter Cage Type

34-7000

1941-'81 bt 7.440" .791" Alloy

34-7003 1936-'52 61" bt 7.440" .791" Iron

34-7004 1941-'81 bt 7.440" .791" Iron

34-7010 1981-'84 bt 7.440" .791" Alloy

34-7011 1981-'84 bt 7.440" .791" Iron

34-7012 1984-Up bt 7.440" .792" Alloy

34-7013 1984-Up bt 7.440" .792" Iron

34-7200 1941-'81 bt 7.440" .791" Alloy

34-7203 1941-'81 bt 7.440" .892" Iron

34-7206 1941-'81 bt 7.440" .791" Iron

34-7210 1981-'84 bt 7.440" .791" Alloy

34-7211 1981-Up bt 7.440" .892" Iron

34-7212 1981-'84 bt 7.440" .791" Iron

34-7213 1984-Up bt 7.440" .792" Alloy

34-7214 1984-Up bt 7.440" .792" Iron

34-7500 1957-'81 xl 7.440" .791" Alloy

34-7510 1981-'85 xl 7.440" .791" Alloy

34-7700 1957-'81 xl BB 7.440" .791" Alloy

34-7703 1957-'81 xl BB 7.440" .892" Alloy

34-7710 1957-'81 xl SB 7.440" .791" Alloy

34-7720 1981-'85 xl BB 7.440" .791" Alloy

34-7721 1981-'85 xl BB 7.440" .892" Alloy

34-7722 1986-Up BB 7.440" .792 Alloy

34-7730 1981-'85 xl SB 7.440" .791" Alloy

34-7800 1986-Up xl 6.926' .792" Alloy

34-7900 1986-Up xl (Spec.) 7.113" .792" Alloy

34-7903 1984-Up bt (Spec.) 7.113" .792" Alloy