How do you tell what CC engine you have?

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Taylor20001

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Hello, I have a new used Schwinn with a motor on it but know idea what CC it is, so I can start buying parts for it to tweak it out. So how do you tell ???
 
Normally if you have a found head and jug it's 49cc.

But square head and jug can be 66 or 69 cc

Best way to know it is to remove the head and measure the bore and stroke and do the math.
 
48 have 10mm nuts on m6 studs

66 has 13mm nuts on m8 studs.

studs are (from memory)

39 mm apart on a 48,

45mm on a 66. measured "square" not diagonal...

other external differences are minor... 48 has smaller thicker fins...? 66 is wider in the cylinder etc...

if you pull head off,
48 has a 40mm piston,

66 is 47mm
 
48 have 10mm nuts on m6 studs

66 has 13mm nuts on m8 studs.

studs are (from memory)

39 mm apart on a 48,

45mm on a 66. measured "square" not diagonal...
It is not quite that simple, so measuring between the head studs
is the best way to know which motor you have.

The 66 cc Grubee Starfire motors have 6 mm head studs.
along with other non branded motors from NaiTong JaiLi

The new 66 cc Grubee rat motors have 6mm head studs too.

50 cc motors come in round and square head.
 
Here are the pictures of the engine

I hope by seeing these you can tell what CC it is.

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In need of a gas cap cam off on the way home

I have take a pick of the gas tank because I have lost the gas cap. the size is 1 1/4 for the part that goes in the tank and the ears that stick out are 1 3/8 across. If any one has one or knows were to get one please reply.:geek:
 
It looks like a 66cc engine from the photo. Measure between the head nuts (photo below of what im talking about)

http://tinypic.com/view.php?pic=2vxhlqe&s=7

If it is a 66cc engine the distance between the nut is 45mm apart.

You can get gas tank lids from ebay for cheap, just type (motorized bicycle gas tank caps) What country are you located in?

Let us know what the distance is between the nuts asap.
 
CC

Hello, do you know what that is in inches??? USA Texas North Richland Hills area.
 
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