ANYONE KNOW WHAT CAUSED MY 820 US MOTOR POWER 2 CYCLE TO SNAP THE ROD BOLTS A COUPLE HOURS AFTER A TOTAL REBUILD? I TORQUED THE BOLTS AS SPEC'D. I PUT A NEW BLOCK, PISTON, ROD BEARINGS, & SEALS. I DID REUSE THE HEAD BOLTS, ROD BOLTS, ROD, WRIST PIN & BEARING, HEAD GASKET/SHIMS. THE NEW PISTON SEEMED TO HAVE THE SAME DIMENSIONS AND DID NOT SEEM TO HAVE ANY PROBLEMS RUNNING, ASIDE FROM LARGE CC "YANK YOUR ARM OFF TRYING TO START IT" COMPRESSION. THE ROD BOLTS WERE LOC-TITE'ED AND DID NOT BACK THEMSELVES OUT. THEY BROKE RIGH IN HALF. AFTER DETERMINING THAT IT WAS TO MUCH COMPRESSION TO START, I NOTICED THE HEAD HAD A BOSS FOR A DECOMPRESSION VALVE, SO I TAPPED, THREADED, AND INSTALLED ONE. I MADE DOUBLE SURE THERE WAS NO INTERFERENCE WITH THE PISTON AND THE DECCO VALVE. EITHER PUSHED IN OR OUT. THE HEAD GASKETS WERE MARKED WITH .010 AND THE OTHER WITH .020 . COULD I HAVE NEEDED MORE SHIMS AND GOT THE COMPRESSION TO HIGH? IT TAKES A MAN TO START THIS SAW. TWO HELPED, AS THERE IS NO THROTTLE LOCK ON THIS SAW. (NEVER WAS) THE ENGINE IS ON A RACINE RAILROAD PRODUCTS RAIL CUTOFF SAW WITH A 16" BLADE. FROM WHAT I UNDERSTAND ABOUT THIS MOTOR WHEN READING ABOUT IT ON THE INTERNET, IT WAS DESIGNED IN THE 50'S BY CHRYSLER/ WEST BEND AS AN OUTBOARD ENGINE, BUT FOR SOME REASON THE 30,000 OF THEM TOOLED UP DIDN'T GET SOLD. LEAVING A MANY 820 PARTS AS SURPLUS. US MOTOR POWER NOW HAS THEM, AND STILL SELLS PARTS FOR THESE ENGINES, AS WELL AS COMPLETE ENGINES. THEY STILL SELL THESE TO RACINE RR PRODUCTS TO PUT ON THIER SAWS. THEY LOOK LIKE A 4 STROKE AT FIRST GLANCE. THIS SAW WEIGHS ABOUT 45 LBS!
ANY HELP OR ADVICE WOULD BE APPRECIATED, MAYBE I AM MISSING A FUNDAMENTAL STEP IN MY REBUILD PROCESS? THANKS alexcagle
ANY HELP OR ADVICE WOULD BE APPRECIATED, MAYBE I AM MISSING A FUNDAMENTAL STEP IN MY REBUILD PROCESS? THANKS alexcagle
