mystery scooter engine chain drive

GoldenMotor.com
D

deskman

New Member
Aug 29, 2012
42
0
0
california
hello!

first time builder here...tonight I picked up a free engine from a buddy of mine, a small sticker on the side says 43cc scooter engine.

the engine has a centrifugal clutch and is pull start...also the air intake is missing a piece i think

as you can see from the pictures its very wide, making the shaft extend far past where the sprocket will be placed. to make it come close to aligning i'd have to be placed verrrrry far off center.


http://i.imgur.com/ikdyw.jpg

http://i.imgur.com/AAZDO.jpg

http://i.imgur.com/uRjME.jpg

i'll be using a mountain bike, it fits fine aside from the width.

one of my priorities with this project is that i'll be able to pedal so i need clearance.



so questions,

a. is it worth it to use this engine? im a first time builder, am i getting in over my head?

b. will this engine be faster than a 66cc china girl? more reliable? i'm looking for the ability to tackle some hills as well



c. would a rear mount be a more elegant solution?
 
D

deskman

New Member
Aug 29, 2012
42
0
0
california
since its got a centrifugal clutch does that mean if i do a friction drive there will be no resistance if i were to pedal with the engine off?
 
Ludwig II

Ludwig II

Well-Known Member
Jul 17, 2012
5,071
783
113
UK
There will probably be transmission drag if you pedal, how much, I don't know. The reason for the engine being wide is you have what I think is a reduction gearbox fitted to bring the revs down so you only need 1 stage of reduction after it to drive the back wheel.
 
tooljunkie

tooljunkie

Member
Apr 4, 2012
663
5
16
Manitoba,Canada
looks like a good candidate for a jackshaft and a rear mount.there would be more fabrication compared to an engine kit.
something you need to know is the ratio in the gearbox.
 
wayne z

wayne z

Active Member
Dec 5, 2010
1,743
5
38
louisiana
That engine has a 5:1 reversing gearbox. The output shaft turns opposite of the engine rotation. It also has an electric starter behind the pull starter. This is another reason the engine is so wide.
A buddy of mine built a rack mount with one of these, with the engine running a freewheel sprocket on the pedal crank, and he used the derailer gears. Runs great,but It is not as powerful as the 66cc HT engines.
 
pocdragon

pocdragon

New Member
Apr 30, 2011
128
1
0
RI
M

MRJOHN

Member
Oct 31, 2009
73
2
8
53
usa
deskman said:
hello!

first time builder here...tonight I picked up a free engine from a buddy of mine, a small sticker on the side says 43cc scooter engine.

the engine has a centrifugal clutch and is pull start...also the air intake is missing a piece i think

as you can see from the pictures its very wide, making the shaft extend far past where the sprocket will be placed. to make it come close to aligning i'd have to be placed verrrrry far off center.


http://i.imgur.com/ikdyw.jpg

http://i.imgur.com/AAZDO.jpg

http://i.imgur.com/uRjME.jpg

i'll be using a mountain bike, it fits fine aside from the width.

one of my priorities with this project is that i'll be able to pedal so i need clearance.



so questions,

a. is it worth it to use this engine? im a first time builder, am i getting in over my head?

b. will this engine be faster than a 66cc china girl? more reliable? i'm looking for the ability to tackle some hills as well



c. would a rear mount be a more elegant solution?
Click to expand...
i have one 45 to 50 mph

motorMount http://www.curtisparts.com/web_gas/49cc_Pocketbike_motorMount.htm

http://www.bikeberry.com/engine-kit-parts/4-stroke-gas-engine-parts/heavy-duty-4-stroke-mount-plate.html

GEAR BOX
http://www.tsunamibike.com/catalog/item/5535391/7025488.htm


sprocket and chain ,gear box sprocket
http://thatsdax.com/ENGINE_KIT_PARTS_PAGE_2.html

iave a look at may bikehttp://motorbicycling.com/showthread.php?t=40606
 
You must log in or register to reply here.
Top Bottom