Engine
- Thread starter canalcat
- Start date
dougsr.874
Active Member
- Local time
- 11:55 PM
- Joined
- Sep 15, 2008
- Messages
- 570
Size of the piston
wheelbender6
Well-Known Member
It's stamped on the cylinder of most engines. China girl 2 strokes do not have engine displacement
shown on them anywhere. The China girls are 50 or 66cc.
shown on them anywhere. The China girls are 50 or 66cc.
D
Deleted member 12676
Guest
measure the inner cylinder diameter. 40mm is a 48cc
HeadSmess
Well-Known Member
- Local time
- 2:55 PM
- Joined
- May 17, 2010
- Messages
- 3,048
look at pics. once learnt, the difference is obvious. 66 usually have slant heads (not always) and the cylinder seems more "vertical" on the case. theres more but those features stick out as obvious...
or yeah..40mm= 50cc, 47mm = 66cc (piston diameters)
or yeah..40mm= 50cc, 47mm = 66cc (piston diameters)
MotorBicycleRacing
Well-Known Member
Easy.
If it has 8 mm head studs it is a 47 mm bore 66 cc or 69 cc
If it has 6 mm head studs it is probably a 48 cc with a 40 mm bore.
The 48 cc sizes are not as common as the 66 cc motors.
The studs are also further apart on a 66cc than a 48 cc
What did your seller say it was?
There is no such engine size as a 80.
There are 2 kinds of 47 mm bore 66 cc pistons, one has a lower wrist pin
hole location than the other.
They both use the same rings and needle bearing,
but the wrist pin is shorter on the high hole piston.
MotorBicycleRacing
Well-Known Member
There is no need to remove the cylinder head to figure out what size motor you have.
D
Deleted member 12676
Guest
yes, the 66cc has more distance between cylinder bolts than the 48cc which is 43mm
MotorBicycleRacing
Well-Known Member
Do you doubt it?
8 mm head studs would prove that.
