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How to tell what motor you really have 49cc-110cc 4 stroke.

154134 Views 65 Replies 33 Participants Last post by  benjnmercy, 
T
On the block you will find a number cast mine is on the left side under the transmission. This is on the block generally you can find a casting on the head as well but sometimes they miss with that before they ship the bikes.......
if the casting says:
1p39fmb = 49cc
1p47fmf = 70cc
1p47fmf = 90cc
1p50fmg = 100cc
1p52fmh = 110cc
hope this helps
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B
did you notice the correlation between the engine number and the bore size?

39mm bore is a 49cc
47mm bore is a 72cc
52mm bore is a 110cc( of course it has a different crank also)

seems like the engine codes tell you the bore size
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T
y is 70cc & 90c the same code??? if they r the same bore, then how does 1 differentiate?

tjferris said:
On the block you will find a number cast mine is on the left side under the transmission. This is on the block generally you can find a casting on the head as well but sometimes they miss with that before they ship the bikes.......
if the casting says:
1p39fmb = 49cc
1p47fmf = 70cc
1p47fmf = 90cc
1p50fmg = 100cc
1p52fmh = 110cc
hope this helps
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P
Should say the size stamped on this motor like this

http://www.sdeonline.us/auctions_c/bike/Images/107.jpg
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D
I just recieved my x7 ( without lights) and it has 48cm³ on that black portion of the engine. Does that mean its a 90cc?
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djbess said:
I just recieved my x7 ( without lights) and it has 48cm³ on that black portion of the engine. Does that mean its a 90cc?
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CM³=CC

Which means you have a 48CC engine, 49CC model pocket bike.

Everyone over rates the engine size. For instance most 110CC are really 107CC.

Kinda like when Ford said their 302 was a 5.0, when its really like a 4.9. The Chevy 305 was a TRUE 5.0.

:)
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D
oh ok, i was hoping it was a lil bigger, does that mean it puts out less power than the stroke version stock?
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B
the problem is that a lot of the engines stamped 48 and 49cc are actually 72cc, when you remove the head you can measure the bore size and you will notice that almost every engine stamped 48cc that I have come across is actually 72cc.
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bartw said:
the problem is that a lot of the engines stamped 48 and 49cc are actually 72cc, when you remove the head you can measure the bore size and you will notice that almost every engine stamped 48cc that I have come across is actually 72cc.
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To my knowledge there is more to finding out the cc of an engine then just measuring the bore. IE measureing the stroke also.

I highly doubt they would stamp a 70cc motor with 48cc.
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T
ok so here we go I had a typo on my first post but here are all the engine sizes, numbers on the block, numbers on the head, and bore and stroke

size serial on block stamped on head bore xstroke

49cc 1P39FMB 49CM3 39 X 41.4 MM
70CC 1P47FMD 72CM3 47 X 41.4 MM
90CC 1P47FMF 86CM3 47 X 49.5MM
100CC 1P50FMG 97CM3 50 X 49.5MM
110CC 1P52FMH 107CM3 52.4 X 49.5MM

I hope this helps all of you out!!!
the cc size of the engine is a function of the bore (diameter of the piston) and stroke (length of travel of the piston) together as you can see above some models have the same piston dia. but a longer stroke making them have a bigger cc rating and some have the same stroke but a bigger piston dia. giving them a bigger stroke. :D
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tjferris said:
ok so here we go I had a typo on my first post but here are all the engine sizes, numbers on the block, numbers on the head, and bore and stroke

size serial on block stamped on head bore xstroke

49cc 1P39FMB 49CM3 39 X 41.4 MM
70CC 1P47FMD 72CM3 47 X 41.4 MM
90CC 1P47FMF 86CM3 47 X 49.5MM
100CC 1P50FMG 97CM3 50 X 49.5MM
110CC 1P52FMH 107CM3 52.4 X 49.5MM

I hope this helps all of you out!!!
the cc size of the engine is a function of the bore (diameter of the piston) and stroke (length of travel of the piston) together as you can see above some models have the same piston dia. but a longer stroke making them have a bigger cc rating and some have the same stroke but a bigger piston dia. giving them a bigger stroke. :D
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oh yea and here is the hp ratings
49cc= 3.0hp
70cc= 5.5 hp
90cc = 6.0 hp
100cc = 6.5 hp
110cc = 7.0hp:thumbsup:
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T
bartw, wat is ur observation in regards to the serial# when u discovered it is a 72cc??? did it have the serial# of a 49cc (1P39FMB)?

bartw said:
the problem is that a lot of the engines stamped 48 and 49cc are actually 72cc, when you remove the head you can measure the bore size and you will notice that almost every engine stamped 48cc that I have come across is actually 72cc.
Click to expand...
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B
I can check tomorrow. I noticed a while back that most of the engines labeled 48cc were actually 72s but in the last few months I also found a lot of engines labeled 49cc to be 72s also.

To answer the earlier question that it takes more than bore size to determine the size of the engine, the answer is of course it does unless we already know what each size engine uses and the bore will tell you which model you have without having to measure the stroke.

TTMAN said:
bartw, wat is ur observation in regards to the serial# when u discovered it is a 72cc??? did it have the serial# of a 49cc (1P39FMB)?
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I just tore apart a 1P39FMB, labeled 48cm. bore is 47mm stroke is 41.4 which equals 70CC
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bartw said:
To answer the earlier question that it takes more than bore size to determine the size of the engine, the answer is of course it does unless we already know what each size engine uses and the bore will tell you which model you have without having to measure the stroke.
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True, Just like honda the china motors use the same crank for the 49, and the 70 which will be the same stroke. the 110 uses a different crank with a longer stroke.

Honda Specifications

50CC 39mm bore 41.4mm stroke
70CC 47mm bore 41.4mm stroke

110CC 52mm bore 49.5mm stroke

this is why you cant tell the 49 from the 70 without taking the bore measurment. the 110 just looks bigger.
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B
exactly what we have been discussing. I think it is hard for people to believe us because 99.99% of the sellers have no idea what they are talking about and put too much jibberish out there that people listen to. If you want answers about a Chinese product you will have to find out for yourself.
Hot_Rod_ said:
True, Just like honda the china motors use the same crank for the 49, and the 70 which will be the same stroke. the 110 uses a different crank with a longer stroke.

Honda Specifications

50CC 39mm bore 41.4mm stroke
70CC 47mm bore 41.4mm stroke

110CC 52mm bore 49.5mm stroke

this is why you cant tell the 49 from the 70 without taking the bore measurment. the 110 just looks bigger.
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T
sweet!!! dat gives me some hope dat I at least may have 70cc :thumbsup:

Hot_Rod_ said:
I just tore apart a 1P39FMB, labeled 48cm. bore is 47mm stroke is 41.4 which equals 70CC
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H
So where on an X6 110cc 4 stroke motor is this code at (Front, Back, Botton sides?)? Mine is coming in soon and I WANT TO MAKE SURE IT IS a 110cc! TTMAN has got me ryled up. I better not get duped. I bought a 110cc and by gosh I better be getting one.
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HELLB0Y said:
So where on an X6 110cc 4 stroke motor is this code at (Front, Back, Botton sides?)? Mine is coming in soon and I WANT TO MAKE SURE IT IS a 110cc! TTMAN has got me ryled up. I better not get duped. I bought a 110cc and by gosh I better be getting one.
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Did you actually read this thread? look at the very first post in this thread pay special close attention to the sentance "the serial number is cast on the block mine is under the transmission" maybe there you will find your answer..........
Hint: the transmision is on the side of the motor........the side you shift with:rolleyes:
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I did read this whole thread. I know the engine very well thank you. in other words I am taking your shot to my intellectual stomach as an insult. Never the less let me rephrase my original post... FOR PEOPLE WHO HAVE A X6 110cc WHERE IS YOUR CODE LOCATED ON YOUR ENGINE???? There maybe that will be more descriptive and not cause further shots of insults.

HINT: Just ride... Don't insult <------ ;)
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