Hello I was hoping you all could help me with bore and stroke of the chinese honda gy6 lifan loncin clone engines used in chinese atv's. Preferably 50,70,90,110,125,150cc versions.

I was debating on upping the displacement on my dauggters taotao 110 atv and decided to look up bore x stroke.

I can't really seem to find any concrete specs that don't condradict other info I've seen

I also read that there are 2 different 110cc engines. One with bigger bore shorter stroke and other with smaller bore longer stroke. Might be same case for other displacements too. Is this true? How do I tell which 110 I have before tearing it apart?

I'm really curious of bore and stroke of the 50-150cc engines before building my 110cc.

Thank you all!

 

The GY6 is a circa 150cc fan cooled four stroke. All the other engine sizes you quote are based on the Honda E22, except the 125 which is available as either an E22 or a vertical cylinder clone of the Honda CG125 engine. Apart from having a horizontal cylinder E22 and GY6 have nothing in common. As for cylinder bore/stroke check the honda C50, C70, C90 C110 motorcycle specs for this on Google. Some Chinese makers may have dodged having to make different crankshafts, by making big bore versions of smaller engines, I suspect the 125 versions will be bored out 110s, but the only way you will find out your bore/stroke is by taking the head off.

 

from what i was told by the dealer the 90-135 are all the 110 engine just bigger chassis size. engine size does not change till the 150cc

 

Awesome! After more reading I see its not a gy6 but a e22 clone.
I guess gy6 has a Q and e22 has an F. 139Qmb vs 139Fmb.

Now I see some have a P thrown in. 1P571mj 1P52Fmh.
What makes the P different??

And I guess there are short and long strokes of same cc.
152fmi and 154fmi are both 125 bc the I but dif bore bc 52 54.
Makes it more confusing

 

The 110 in my dauggter china quad says 152fmh which I think is 52mm bore x 49.5mm stroke. Pretty much trx90 147fmf with 52mm bore instead of 47mm. Same stroke.

114cc 54mm is the biggest "big bore kit" I've seen for 49.5mm crank.
I will probably go this route and worry about longer stroke "125" if this ever blows up.

Do these motors have a big valve head and small valve head like gy6?
Is there a 4 valve head?
What is the difderence with "p" motors?

 

The E22 is used in "pit bikes" this term is used more in Australia and the UK. They seem to be used in competition, so lots of big valve heads, hot cams and alloy cylinder kits are available, but I suspect a 125cc or 150cc complete motor may cost less than the tuning bits your 110 would need to produce the same power.