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

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. $49.00 each.

Order rings below

Piston Rings
Quality piston rings, standard thru 1.00mm oversize bore size
ONLY for the late model, 447 motors, 1974 -1984.
Sold PER PISTON, order 2 sets

Standard Size 256 Piston Rings
Quality 256 piston rings, standard bore size ONLY
for the early motors, 1.5mm top ring, 1970-1973. Sold PER PISTON, order 2 sets

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Intake Valves

OEM quality 3 piece intake valve
Sold each.

2mm Oversize Intake Valves

2mm O/S Intake valve. Optimizes valve throat ratio.
Sold each.

Exhaust Valves

OEM quality 3 piece exhaust 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

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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 cam chain, better than OE quality, fits '70-73 w/ master link.

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

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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.

Three Bond Liquid Gasket

Three Bond Liquid Gasket 1104 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.

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

Ferodo Premium Clutch Plate Kit
Friction discs, 80-84, 6 discs

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.

Heavy Duty Clutch Springs

Fits All XS
Springs are 10% stronger than stock springs.
Set of 6,
Spring free length is about 1.640".

Heavier Duty Clutch Springs

Fits all XS
Set of 6,
Spring free length is about 1.835".

Heavier Duty Clutch Springs

Fits all XS
Set of 6,
Spring free length is about 1.50".

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

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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 you 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.