i have one engine that is supposed to be a 49 c.c., and another one that is a 66 c.c. (80)
they are both h.t. style engines, but the 49 c.c. is designed a little different than the typical 66 c.c. the 49 c.c. has no intake tube, (carb. is bolted right to the cylinder) a different style carb. regular nuts holding the head on (not the acorn style nuts), a square looking cylinder, and a slant head.
here is exactly what the sticker on the side cover says on my "49" c.c. engine:
date of mfg. Feb. 2009
This engine conforms to 2009 U.S. EPA
regulations for small non-road engines.
ENGINE FAMILY:9RCGS0661RG
DISPLACEMENT: 66 C.C.
EMISSIONS COMPLIANCE PERIOD : 50 HOURS
ENGINE MODEL # 66RZ
now, i just bought a 66 c.c. engine that is a typical h.t. engine with the intake tube, acorn nuts on the head, a more rounded cylinder, and a slant head.
here is exactly what the sticker on the side cover of this engine says:
date of mfg. sept. 2009
This engine conforms to 2009 U.S. EPA
regulations for small non-road engines.
ENGINE FAMILY:9RCGS0661RG
DISPLACEMENT: 66 C.C.
EMISSIONS COMPLIANCE PERIOD : 50 HOURS
ENGINE MODEL # 66RZ
the sticker from the "49" c.c. engine is yellow, while the sticker from the 66 c.c. is blue, but they both say the exact same thing other than the date of mfg. and the serial #.
these engines have the same amount of power and they both run very well (but i did some tuning on both of them)
so...when you buy a "49" c.c. engine are you actually getting a 66 c.c.? has everyone noticed that 49 c.c. 2 stroke h.t. style engines are prtty tough to find these days? could it have been a way to lure people in to the hobby for a little less money? thinking they were getting a smaller 49 c.c. engine, when in fact they were getting 66 c.c. engines at a cheaper price?
the only way to tell is to tear it apart and measure everything, but i'm not going to do that.
or, is it just that I got what I got, and the vendor I used was selling slightly different looking 66c.c. engines saying that they are 49 c.c.'s?
i don't know but both of my engines run the same and they both feel like they have the same power. both of my bikes have 41 tooth sprockets on them, and modified exhausts.