engine

Engine Parts
Replacement Pistons 447 Big Bore Kits Rings Valves Valve Seals Cam Chains Cam Chain Guide
SEALS & GASKETS

SPIN-ON OIL FILTER CONVERSION

Will it make your XS engine last forever?

This replaces the filter screen in the side cover with a modern, disposable filter, available in chrome and black. It projects about 2", giving a burly, modified look. Everyone will know you love your XS enough to give it a supply of clean oil. Side cover must be removed and 2 holes drilled and 2 holes filled with J-B Weld. Kit includes: Adapter and gasket, hardware, and 620 Loctite.

4 filters available: black or chrome, with (K&N) or without safety wire---$7.49 to $16.50

Replacement filters: Fram PH6017 K&N KN303 EMGO M82230 Vesrah VSF4005

HON 15410-MM9-013 KAW 16097-1063 YAM 3FV13440-00

Oil filter installation instructions

*****************************************

Oil Filter/Cooler Kit

No modifications are required to install this kit, which uses a common Honda filter. Housing is finned aluminum billet.

*****************************************

Light Weight Drain Plug Kit

For those of you who want to lose 7.2 oz. of dead weight or just wish to have an easier time of removing your drain plugs when changing oil, 650 Central offers a drain plug kit, with a 14mm-headed magnetic plug, drilled for safety wire. Sold each, order 2 for both plugs.

*****************************************

BACKORDER Billet oil cooler/filter cover adaptors BACKORDER

For those want to run a remote oil filter and/or cooler. Made from 6061T6 billet. Case must be tapped for feed line, and an internal passage must be blocked

*******************************************

750cc BIG BORE KITS

Fits motors with 447 connecting rods (1974 and newer engines) .
We offer 2 bore sizes for these engines.
Each kit includes (2) of the 9.5:1 compression Wiseco brand
pistons that are good for pump gas.
(2) Sets of Piston Rings, Piston Pins and Clips.
(2) cylinder sleeves and a special Big Bore head & base gasket.

CYLINDER BORING AND SLEEVING REQUIRED

Composite Big Bore Head Gaskets

650 Central ...043" ....KCEN11-18150... $49.95

Big Bore Head & Base Gasket Set

Composite head and base gasket set for our 750 Big Bore kits.

Copper Big Bore Head Gaskets

Now, set your piston-to-head height for maximum performance. Available in .026", .032", and ,042". 81.5mm bore
Our composite Big Bore gasket is .043" and the XS Performance composite is .060" (1.5mm)
Need something special? CALL ME Sold each.

Big Bore Base Gaskets

Sold each. Our Big Bore base gasket is .020"

Sleeve installation is available for $325.00 plus
shipping, call or E-mail before shipping your cylinders.

WRIST PIN OILING MODIFICATION

This modification helps keep the soft small end of the stock rods live, a real problem with 750s,

especially when run hard or raced. Once the copper plating is damaged, they WILL be seeking daylight.

Big Bore Cylinder and Piston Kit

The only complete bolt on Big Bore 750cc cylinder and piston kit ever made for the XS650 Yamaha

Modified limited production European Race Engine Cylinder Block has enlarged fins for improved cooling. The New Cylinder Block has longer fins matching the Head Fin Length.
Kit Fits: 1974-84 447 Type Engines

Kit Includes:

XS Performance Big Bore Race Cylinder Block with sleeves installed and finished to fit our 80mm. Forged Big Bore (750cc.) Pistons. Cylinder casting has larger cooling fins that extend out the same distance as the cylinder head fins for enhanced cooling. No modifications to engine cases needed.
Forged 80mm. 750cc Big Bore Piston kits(2) complete with Ring Sets, Piston Pins & Clips. Forged 447 type Pistons feature:

Big Bore Cylinder Head Gasket & Base Gasket.

650 Central "Street Fighter" Cam

This cam's 100 degree lobe centers make your exhaust system work over the widest range. For '74 on up (36T) 447 motors
Stock pistons, valve guides and seals OK. Must use spring kit below.
$100 refundable core charge upon receipt of you regrindable stock cam.

Hi-Performance Valve Spring Kit

These springs are good for cams with up to .450" lift. Top retainers are 7075 T-6 Aluminum.

Fit all XSs '72-84.

Replacement Oversize Pistons

These fit the 447 engines produced from 1974 - 1984.
Each brand new piston comes complete with
Piston Pin and Pin Retaining Clips. Made in Japan
to exacting dimensional specifications for replacement pistons.
Available in 1st (0.25mm), 2nd (0.50mm), 3rd (0.75mm), & 4th (1.00mm) oversize.
They are sold each, so order 2 for each engine.

Order rings below

Piston Rings
Quality piston rings, standard thru 1.00mm oversize bore size. ONLY for the late model, 447 motors, 1974 -1984.
STD sets ONLY feature upgraded combination compression/oil scraper 2nd ring. Sold PER PISTON, order 2 sets

Standard Size 256 Piston Rings
Quality 256 piston rings, featuring upgraded combination compression/oil scraper 2nd ring. Standard bore size ONLY
for the early motors, 1.5mm top ring, 1970-1973. Sold PER PISTON, order 2 sets

*******************************************

Intake Valves

OEM quality 3 piece intake valve
Sold each.

Polished Stainless Steel Intake Valves

Polished stainless steel intake valve with collets.
Fits all 650s. Sold each

Polished Stainless Steel Exhaust Valves

Polished stainless steel exhaust valve with collets.
Fits all 650s. Sold each

Valve Stem Seals
Sold singly. Fits 70 thru 84 engines

*******************************************

Cam Chains

Tsubaki cam chain, endless, better than OEM quality, fits '74 up, Merc's choice

Cam chain master link, must be purchased with the above chain
(NOTE: It ONLY fits this chain),

Tsubaki "Peanut" cam chain, endless, better than OEM quality, fits '74 up, 5% lighter. Rivet master link included.

"Peanut" Cam chain master link
(NOTE: It ONLY fits this chain),

Tsubaki cam chain, better than OE quality, fits '70-73. Master link included.

Spare Cam chain master link for '70 - 73
(NOTE: It ONLY fits this chain)

Front Cam Chain Guide

Front Cam Chain Guide, fits all years.

Cam Chain Tensioner Arm Assembly

Cam chain tensioner arm assembly. Fits '74-84

******************************************

Copper Head Stud Sealing Washers

Replace the stock sandwich washers with these copper to stop head and base gasket leaks,

especially on built motors. 4 required.

*****************************************

CLUTCH

Clutch detail with spacer dimensions

Ferodo Premium Clutch Plate Kit
Friction discs, 74-79, 7 discs

EBC Clutch Plate Kit
Friction discs only

PRO Brand Clutch Discs

For 1974 - 1979, order 7 discs.
For 1980 - 1983, order 6 discs.

Barnett Premium Clutch Plates

Barnett Kevlar clutch plates, .120" thickness
For 1974 - 1979, order 7 discs. For 1980 - 1984, order 6 discs.
Maximum bite. Not recommended for street use---unless you really need them.

Replacement Steel Plates

#JMXS39-6507 ..... $6.50 each

Heavy Duty Clutch Springs

Fits all XS
Set of 6, 14% stronger than stock
Spring free length is about 1.67".

Heavier Duty Clutch Springs

Fits All XS
Set of 6, 27% stronger than stock
Spring free length is about 1.61".

Heaviest Duty Clutch Springs

Fits all XS
Set of 6, 43% stronger than stock
Spring free length is about 1.50".

****************************************************

Clutch Rod Oil Seal
That pesky little clutch rod seal behind the drive side cover.

Engine Oil Seal Kits
This set contains oil seals for all years of the
TX & XS650 engine. It includes: countershaft, crankshaft,
(2) camshaft, shifter, kick starter, clutch rod,
decompression lever and electric starter seals!

Oil Filters

Replacement Oil Filter.
This unit will replace the filter in the
right side cover On all Yamaha XS650's.
Why change your oil and not change your filter?
It's cheap insurance for your engine!

Replacement Sump Oil Filter.
The XS650's are known for a weak original equipment
sump oil filter. We rarely see one that is not torn.
Replace your torn, ineffective sump screen with our
OE-style reinforced sump screen.
Stop those harmful contaminants before
they circulate through your engine!

Drain Plug Gaskets

Replacement Copper Drain Plug Gaskets.
Stop that pesky leak and keep your bike clean!
Fits all XS650's.
You get (2) copper gaskets.

Electric Starter Repair Kit

This spring and gear set replaces the worn #4 gear in the starting system so
often responsible for that nasty grinding sound and "kicking out"
of the electric starter on the 72-83 XS650's.

********************************************

Three Bond Liquid Gasket

Three Bond Liquid Gasket 1194 is a semi-drying OEM approved liquid gasket formula
which forms an elastic, reliable gasket seal. It is resistant to damaging fluids, chemicals, heat,
pressure and impact. Three Bond 1104 is for metal-to-metal joints, such as the engine cases, or cylinder head cover. We use it as a substitute for "Yamabond #4" gasket sealer on our engines.
3.5 oz (100g) tube

Gasgacinch Gasket Sealer

The gasket sealer that holds gaskets in place during assembly of parts like
no other you have ever used! Comes in a 4 oz. can with a swab applicator
attached to the top. Quick drying and fast sealing formula.