Click to enlarge

STOCK_TYPE 53.50MM BIG_BORE PISTON_KIT (CT90K5_TO_1979)  (ATC90_F/N_1113935_+)  (ALL_OTHER_90'S_READ*)

NOTE !!!!!!!!!!!!

DUE TO WEAR ON ROD, CRANK, DIFFERENT CYLINDER DECK TO DECK MEASUREMENT, AND OTHER VARIANCES,,,,

"SOME_TIMES" THE PISTON DOME WILL JUST BARELY HIT THE HEAD'S DOME.

TO TEST FOR THIS SYNDROME JUST START THE NORMAL REBUILDING PROCESS BY :

1. PUTTING THE PISTON WITH RINGS ON THE ROD

2. THEN SLIDE THE CLEAN OILED CYLINDER IN PLACE WITH BOTH

THE RUBBER AND PAPER BASE GASKETS AND 2 GUIDE PINS IN PLACE.

3. NOW WITH NO HEAD GASKET AT ALL IN PLACE SLIDE THE HEAD

DOWN WITH THE 2 UPPER GUIDE PINS IN PLACE OVER THE CYLINDER.

4. NEXT PUT A SCREW DRIVER THROUGH THE CAM CHAIN AND INTO

THE CAM HOLE OF THE HEAD TO KEEP THE CHAIN FROM BALLING UP

AT THE CRANK SPROCKET DOWN BELOW.

5. THEN PUT THE TOP HEAD COVER ON AND TORQUE THE HEAD NUTS DOWN TO NORMAL SPEC.

6. NOW THE TEST, TURN THE CRANK OVER SLOW WITH A WRENCH ON

THE FLYWHEEL NUT. IF THE PISTON DON'T HIT THE HEAD THEN

ADD THE HEAD GASKETS AND RESUME THE REBUILD.

7. IF IT DOES HIT, THEN ADD THE INCLUDED 2ND PAPER BASE

GASKET,, NOW ADD THE HEAD GASKETS AND REPEAT THE TEST.


THIS PISTON LOOKS JUST LIKE THE STOCK PISTON WHICH HAS THE LONG SKIRT.. I BELEAVE THIS WILL GIVE A BIT LONGER LIFE.

THE RINGS WITH THESE KITS ARE MARKED R1 AND R2 FOR THE TOP AND 2ND RING, THEN THE NEW TYPE 3 PART OIL RING. THE NUMBERS FACE UP ON THE TOP 2 RINGS.

THE TOP RINGS ARE .97MM THIN RINGS FOR BETTER BREAK-IN AND LESS FRICTION.

THIS KIT WORKS FINE WITH STOCK GASKETS , EVEN THE HEAD GASKET IF YOU HAVE THE NEWER KNOTCHED TYPE, YES =======================================================

*ALL_OTHER_90'S_READ

(ALL CT90K0 K1 K2 K3 AND K4)

(ATC90'S WITH FRAME NUMBERS UP TO 1113934)

(ALL S90 SL90 CL90'S AND CM91'S)

CAN USE THIS PISTON KIT, BUT

1. YOU MUST DREMEL OUT THE COPPER HEAD GASKET OUT TO 54MM ID SO THE DOME OF THE PISTON WILL CLEAR THE HEAD GASKET.

or

2. USE ONE OF THE 54MM ID GASKETS WE SELL , LISTED BELOW ON THIS PAGE.

THESE MODELS USE THE ALL ROUND COPPER HEAD GASKET


OLD//TYPE/53.5MM/(CT9G3)$39.99

BIG_BORE_HEADGASKET OLD TYPE 90CC HEAD GASKET (NO_KNOTCHES) <p>COPPER HEAD GASKET 54.60MM ID 64.60MM OD .032" THICK (313i) BIG_BORE_HEADGASKET OLD TYPE 90CC HEAD GASKET (NO_KNOTCHES)

COPPER HEAD GASKET 54.60MM ID 64.60MM OD .032" THICK (313i)

313i$4.95
Click to enlargeKNOTCHED & ALL ROUND