IF YOU CAN FIND ANY SHINDAIWA ENGINE EXCEPT THE 18CC , BUY IT IF ITS REASONABLE...THEY ARE THE CADILLACS FOR SURE ... HERE IS THE TEST ..........GO TO EBAY AND PUNCH IN SHINDAIWA... THEN PUNCH IN ANY OTHER BRAND AND THE SHINDAIWAS ARE TWICE TO 3 TIMES THE MONEY... I GO INTO THE MOWER SHOPS ALL THE TIME BEGGING FOR SHINDAIWA ENGINES... I GOT A 25CC C-4 4 STROKE A COUPLE OF WEEKS AGO AND TRIMMED DOWN WITH A CARB AND MUFFLER ITS 4 POUNDS.ITS ALSO SUPERCHARGED.. IT TURNS AN 18-8 WITH EASE. TO ABOUT 8K ITS STILL ON MY TEST STAND.. BECAUSE IM TRING OUT SOME DIFFERENT WALBRO CARBS..4 STROKES LIKE SMALLER CARBS THAN A 2 STROKE OF THE SAME SIZE. SHINDAIWA C-4'S HAVE NO DIPSTICK.. AND NO MOUNTING ISSUES... BY 2007 ALL SMALL ENGINES WILL BE 4 STROKE..BY LAW. I HAVE AN 8510 BACK PACK BLOWER AND IT WILL PUSH A BATTERY DOWN THE SIDEWALK... REALLY DOES. HONEST IT CRANKS 225 MPH AT THE NOZZLE END.80CC 4 STROKE .. MMMMMMMMMMMM 1/3 SCALE CUB MAYBE LATER..LEO