HI GUYS ABOUT 3 YEARS AGO I BOUGHT A 1970 STARFIRE WHICH WAS SUPPOSED TO HAVE HAD
A RECENTLY REBUILT ENGINE . WHEN I GOT IT HOME HOWEVER IT APPEARED TO BE A BIT NOISY
FROM THE TOP END > I STRIPPED THE TOP END TO FIND THE SMALL END A BIT WORN SO I LAID
THE BIKE UP UNTIL I COULD FIND TIME TO WORK ON IT ETC . A NEW CONROD WAS CALLED FOR
AND I WILL FIT A STEEL SPECIAL LATER > IN BETWEEN I CAME ACROSS AN INTERESTING
WEBSITE E + V ENGINEERING IN AMERICA WHO HAVE RACED THEM > UNDER TECH TIPS ON
THE SITE IS CRANK INFO AND A65 INFO WHICH I HAVE NOW DECIDED TO USE . I HAVE JUST
STRIPPED THE ENGINE A WEEK AGO AND FOUND THE SLUDGE TRAP FULL OF MUCK > LOOKS LIKE
IT HADNT BEEN REMOVED AND VERY SLIGHT SCORING ON THE SHELLS > HOPEFULLY ALL WILL
CLEAN UP OK > I THINK I CAUGHT IT JUST IN TIME . JUST DOING WORK ON THE CRANK TODAY >
THE SITE SAYS BORE THE CRANK JOURNAL OUT TO 1/8 INCH DIA > I USED A COBALT DRILL BIT
BUT YOU DONT HAVE TO > FIRST OF ALL THOUGH YOU MUST BLANK OFF THE OILWAYS IN THE
SLUDGE TRAP HOLE TO PREVENT SWARF GETTING IN > I USED AN OLD FASHIONED METAL TENT
PEG WHICH LOOKS LIKE A CLUTCH PUSHROD WITH A BEND ON IT WITH A BIT OF PVC TAPE
WRAPPED AROUND IT TO GIVE A SLIDING FIT > YOU WILL STILL GET SWARF IN THOUGH
DUE TO JOURNAL OILWAY SHAPE WHICH CAN BE FLUSHED OUT LATER . I BORED A LITTLE ON ONE SIDE FIRST THEN TURNED OVER THE CRANK AND BORED ALL THE WAY THROUGH FROM THE
OTHER SIDE TO PREVENT SURFACE ROUGHNESS > REMEMBER TO COUNTER BORE EVER SO SLIGHTLY WITH A LARGER DRILL TO PROMOTE SMOOTHER SURFACE > THE NEXT STEP AFTER CLEANING IS TO BORE OUT THE SLUDGE TRAP HOLE 5/!6 DEEPER USING A 7/16 DRILLBIT >
I USED COBALT AGAIN > YOU MUST BLOCK OFF THE OILWAYS IN THE TRAP HOLE AGAIN
THIS TIME I USED A SHORT PIECE OF TENT PEG WITH TAPE AND FILED DOWN THE ENDS OF THE
PEG SO I COULD PULL THEM OUT AGAIN WITH LONG NOSED PLIERS THIN TYPE BUT YOU COULD
USE PASTICINE OR SIMILAR PLAY DOUGH WHICH IS NOT SO STICKY THOUGH > NEXT AFTER THOROUGH CLEANING OF OILWAYS + SWARF ETC IS SUGGESTED TO FIT AN ALLOY PLUG
ARALDITED IN PLACE TO ABOVE THE SURFACE OF THE CRANK THEN FILE IT DOWN FLUSH
HOWEVER AS I DONT HAVE MACHINING FACILITIES , I ARALDITED A TIGHTISH THIN WASHER
WITH SMALL HOLE IN IT PLACING IT ABOUT AN 1/8 INCH ABOVE OILWAY HOLES > I THEN
FILLED UP TO CRANK LEVEL USING EPOXY > I USE HIGHER TEMPERATURE STUFF CONTAINING
STEEL OR METAL WHICH WILL HOPEFULLY DO THE JOB > I AM CURRENTLY WAITING ON THE
EPOXY DRYING 24 HOURS OR SO BEFORE SANDING DOWN > I HAVE ALSO PUT A LITTLE EPOXY
IN THE FLY WHEEL TRAP HOLE TO PREVENT ANY CREEPAGE AND WILL USE NEW ALLEN TYPE
TRAP PLUGSCREW > THIS UPGRADE DOES AWAY WITH THE SLUDGE TRAP AND STOPS OIL
PRESSURE LEAKAGE AT THE FLYWHEEL JOINT > HOWEVER IT IS SUGGESTED THAT YOU NEED
TO FIT AN OIL FILTER KIT TO KEEP OIL CLEAN > NB TURN CRANKSHAFT UPSIDE DOWN SO THAT
ARALDITE DOES NOT RUN INTO OILWAYS THROUGH HOLE IN SMALLWASHER AND PUT PVC TAPE OVER FILLED PLUG HOLE SO THAT DOES NOT RUN OUT EITHER WHILE WAITING ON IT TO CURE
I ACCEPT NO RESPOSIBILITY FOR THESE SUGGESTIONS FROM THIS WEBSITE BUT WELCOME
ANY FEEDBACK YOU GUYS MAY HAVE > I WILL BE CARRYING OUT MORE CONVERSIONS TO CRANKCASE OILWAYS ETC LATER AS PER WEBSITE SO I WILL LET YOU KNOW HOW I GET ON WIYH MY REBUILD CHEERS FOR NOW REGARDS JOHNBOY
https://www.shopevengineering.com/
Heres a link for anybody interested.
John thats the shop that does the A70 pistons i need for the A10 crank i got from you to suit the A65 stroker motor i will get round to soon.
:D
derek
HI DEREK
THANKS FOR THAT > HOPE YOUR PROJECT IS COMING ON OK CHEERS JOHN .