140cc or bigger engine. Any condition considered

[aliengravy]

Bore and Stroke different to the 125 I take it?

I don't know.... some say they are the same... some dont.... I did wonder if i could just get a head/barrel/piston and be done with it

But then im thinking along the lines of throwing the 125 in the CT90

[dread]

i got a 125. was told the rings ant great. so be ni
ce if a 140 did fit. 52.4 are the pistons on 125. what size isthe 140 piston. 54+ is it.

[herrod]

i got a 125. was told the rings ant great. so be ni
ce if a 140 did fit. 52.4 are the pistons on 125. what size isthe 140 piston. 54+ is it.

if its a lifan or yx(stomp) the 140 barrel+piston will go straight on!

[DRAG90]

AG i have a Lifan 140 going spare, in fact it,s the whole bike (Stomp 140) i was going to use it in the ZZ, but i am going to stick with Honda stuff. It owes me 175 notes, if you,re interested

[Boo]

52.4 are the pistons on 125.

That's the long-stroke version of 125 - 52.4 x 57.

An equal amount of 125s out there are 54 x 54.

You can find out which by looking at the engine number.. The first number in the code contains the bore in mm...

viewtopic.php?f=27&t=5379

[dread]

52.4 are the pistons on 125.

That's the long-stroke version of 125 - 52.4 x 57.

An equal amount of 125s out there are 54 x 54.

You can find out which by looking at the engine number.. The first number in the code contains the bore in mm...

viewtopic.php?f=27&t=5379

very good that. reet informative. 152fmi on mine. but no bloody maker. lol. know its got big valve and what nots.

[aliengravy]

So to make a 140... do we need the long stroke or short stroke engine???
Would a 125 head work on a 140? Or does it need to be changed?

And then what about a 160

[dread]

So to make a 140... do we need the long stroke or short stroke engine???
Would a 125 head work on a 140? Or does it need to be changed?

And then what about a 160

dito................ 160 oh yes please. do the 140/150/160 all use oil take off from that plate as tried to look at the odd one on why buy, they looked like the pips came from else where.

[Boo]

So to make a 140... do we need the long stroke or short stroke engine???

For a given bore, obviously the longer stroke will give greater cc.

cc is half bore squared x pi x stroke

so a 56mm bore will get 140cc from the 57mm crank
or a 58mm bore would get 142cc from the 54mm crank.

I haven't a clue how big a bore you can fit between the Cub cylinder stud spacing though. I'm fairly sure above 140cc the Chinese engines use wider spacing.

[aliengravy]

OK, But the length of the bore will be what matters correct? I.e if i put the short one on a long crank engine it wont work because the barrel will be too short??