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liamisace123
06-06-2009, 08:45 PM
hi were can i get a bore kit for a 125cc lifan engine and does it make it 138cc ?? thanks

dj asbo
06-06-2009, 09:13 PM
ive got a lifan 140 bore and piston of dr pepper and he sead it will fit straight onto a lifan 125 botom end im after 25 posted

physco_nutcase_danny
06-06-2009, 09:45 PM
ive got a lifan 140 bore and piston of dr pepper and he sead it will fit straight onto a lifan 125 botom end im after 25 posted
depends on which bottom end you have....if you have the bottom end where the clutch is attached directly to the crank then the 140 kit wont fit as the little end is too small for the piston.the barrell and head is a straight fit though.so the only way round it is to get a 140 conrod kit pressed onto your 125 crank.you cant replace the 125 crank for a complete 140 crank as it wont fit.the 140 crank is for the gearbox where the clutch is attached via a primary gear.not directly to the crank.:thumbs:

dj asbo
06-06-2009, 09:55 PM
depends on which bottom end you have....if you have the bottom end where the clutch is attached directly to the crank then the 140 kit wont fit as the little end is too small for the piston.the barrell and head is a straight fit though.so the only way round it is to get a 140 conrod kit pressed onto your 125 crank.you cant replace the 125 crank for a complete 140 crank as it wont fit.the 140 crank is for the gearbox where the clutch is attached via a primary gear.not directly to the crank.:thumbs:


when i baught it of dr pepper he told me it would fit straight onto a lifan 125 botom end

dj asbo
06-06-2009, 09:58 PM
hear is the link to prove it http://www.pitbikeclub.co.uk/showthread.php?t=21061

themountain
06-06-2009, 10:05 PM
hear is the link to prove it http://www.pitbikeclub.co.uk/showthread.php?t=21061

:phe said "he has been told"...doesn`t mean its actually true, does it??

No it won`t fit an 125cc lifan...the barrel is 82mm and the piston got a 15mm pistonpin;)

dj asbo
06-06-2009, 10:07 PM
oright nice to find out now so i got riped off by dr pepper then grate:mad:

themountain
06-06-2009, 10:29 PM
if this is for a genuine 140 lifan then yes:thumbs:

liamisace123
06-06-2009, 10:31 PM
so were could i get one that fits straight onto a 125 :confused:

themountain
06-06-2009, 11:02 PM
so were could i get one that fits straight onto a 125 :confused:
get your barrel bored out to 56mm and get a HC piston at ooracing:thumbs:

physco_nutcase_danny
06-06-2009, 11:10 PM
so were could i get one that fits straight onto a 125 :confused:
you cant put a 138 topend on your lifan 125 gearbox with the clutch directly attached to the crank.you have to buy a 140 conrod kit and have it pressed onto your crank,which means splitting your crank cases.if you have the lifan bottom end where the clutch is linked to the crank via a primary gear then you can replace the whole crank.the 138 barrel is 98mm long same as the 125 barrel.same ports too.like i say the onlyu problem is the gudgeon pin is 0.5mm too big for the little end on the conrod!!

dr pepper hasnt fitted this kit on a 125 he was just told it would fit when he bought it.:thumbs:

physco_nutcase_danny
06-06-2009, 11:12 PM
you cant put a 138 topend on your lifan 125 gearbox with the clutch directly attached to the crank.you have to buy a 140 conrod kit and have it pressed onto your crank,which means splitting your crank cases.if you have the lifan bottom end where the clutch is linked to the crank via a primary gear then you can replace the whole crank.the 138 barrel is 98mm long same as the 125 barrel.same ports too.like i say the onlyu problem is the gudgeon pin is 0.5mm too big for the little end on the conrod!!

dr pepper hasnt fitted this kit on a 125 he was just told it would fit when he bought it.:thumbs:

if you do what 'the mountain' says .....bore out your 125 barrell and fit a high compression piston.:thumbs:

dj asbo
06-06-2009, 11:19 PM
you cant put a 138 topend on your lifan 125 gearbox with the clutch directly attached to the crank.you have to buy a 140 conrod kit and have it pressed onto your crank,which means splitting your crank cases.if you have the lifan bottom end where the clutch is linked to the crank via a primary gear then you can replace the whole crank.the 138 barrel is 98mm long same as the 125 barrel.same ports too.like i say the onlyu problem is the gudgeon pin is 0.5mm too big for the little end on the conrod!!

dr pepper hasnt fitted this kit on a 125 he was just told it would fit when he bought it.:thumbs:


ive never fited eather just got told it would fit when i baught it of dr pepper:thumbs:

physco_nutcase_danny
06-06-2009, 11:27 PM
ive never fited eather just got told it would fit when i baught it of dr pepper:thumbs:

well ive actually tried this for myself bud.got too different lifan bottom ends and a 138cc kit.ive experimented and measured that many times i know them like the back of my hand.
theres no probs with the barrel fitting,thats fine.i could of fitted it in the end as i could of bored out the little end 0.5mm to fit the 138 piston,but then you are weakening the conrod which arnt the best in the start.after a day of messing about,which im glad i did.because now i know whats involved as ive actually tried it...not spoke about it.alot of people just assume which isnt any good.
i just try these things for myself if it dosnt work.o well.atleast i can pass on the info knowing its true because ive tried it for myself.:thumbs::thumbs:

totalpits
06-06-2009, 11:33 PM
the kits fit straight on to lifan 125 engines or 125's with a 14mm gudgeon pin
devil racing use to have some on ebay for around 55, jen had some but don't think she's getting anymore but can ask if you want:thumbs:

physco_nutcase_danny
06-06-2009, 11:34 PM
the kits fit straight on to lifan 125 engines or 125's with a 14mm gudgeon pin
devil racing use to have some on ebay for around 55, jen had some but don't think she's getting anymore but can ask if you want:thumbs:

lifan 125 gudgeon pin is 13mm:thumbs:

totalpits
06-06-2009, 11:40 PM
the upgrade kit has a 14mm pin and new bigger piston and a bigger barrel
they are made for lifans but may fit other 125 engines

there's a vid online on how to fit them despise has one on pit source aswell it's same as fittinga 88 kit,

physco_nutcase_danny
06-06-2009, 11:43 PM
the upgrade kit has a 14mm pin and new bigger piston and a bigger barrel
they are made for lifans but may fit other 125 engines

there's a vid online on how to fit them despise has one on pit source aswell it's same as fittinga 88 kit,

thats why the 138 piston dont fit coz the gudgeon pin is around 13.5mm.
you can only fit if you replace the 125 crank with a 140 crank and the piston will then fit.cant fit this kit on a lifan 125 gearbox with clutch attached directly to crank.will only fit on lifan gearbox with clutch attached to primary gear first.:thumbs:

liamisace123
06-06-2009, 11:46 PM
will it fit a stomp 125 engine ??:thumbs:

totalpits
06-06-2009, 11:46 PM
dunno what my mates was but we got one from westom bank imports a while back and it fitted sweet as a nut on a lifan 125 manual engine still going strong to

liam email west bank imports can't see any on his site now but they used to have them
http://www.westbankimports.com/filtersearch.php?catmen=6&search_type=keywords&filter=CHINESE%20PITBIKES

physco_nutcase_danny
07-06-2009, 12:07 AM
will it fit a stomp 125 engine ??:thumbs:

liam send me a pic of the right hand side of your engine then i will be able to tell you if it will fit or not...:thumbs:

matt132006
07-06-2009, 12:20 AM
liam send me a pic of the right hand side of your engine then i will be able to tell you if it will fit or not...:thumbs:im may fit .. but 125 are shorter stroke.. so the studs wont be long enuff:icon_lol: if u put 140 piston and barrel on

physco_nutcase_danny
07-06-2009, 12:26 AM
im may fit .. but 125 are shorter stroke.. so the studs wont be long enuff:icon_lol: if u put 140 piston and barrel on

hi matt the 138 barrell is the same length as the 125 barrell 98mm.the barrells will fit.piston wont as gudgeon pins are different diameters..:thumbs:

themountain
07-06-2009, 12:44 AM
hi matt the 138 barrell is the same length as the 125 barrell 98mm.the barrells will fit.piston wont as gudgeon pins are different diameters..:thumbs:

the barrel won`t fit , dipstick...and there is nothing like a 98mm barrel:icon_lol:

matt132006
07-06-2009, 12:48 AM
hi matt the 138 barrell is the same length as the 125 barrell 98mm.the barrells will fit.piston wont as gudgeon pins are different diameters..:thumbs:yh i no lol.. im on about 140 barrel and piston.. it longer stroke than 125:thumbs:

physco_nutcase_danny
07-06-2009, 12:51 AM
the barrel won`t fit , dipstick...and there is nothing like a 98mm barrel:icon_lol:

well i stripped all this engine last week...barrell is 98mm.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=190303850308 138 barrell.

http://cgi.ebay.co.uk/Motocross-125cc-CYLINDER-Xsport-Thumpstar-Pit_W0QQitemZ190308073193QQcmdZViewItemQQptZUK_Mot orcycle_Parts?hash=item2c4f3ebee9&_trksid=p4634.c0.m14.l1262&_trkparms=%7C301%3A0%7C293%3A1%7C294%3A30 125 barrell.

THEMOUNTAIN LOOK AT BOTH LINKS...BOTH BARRELLS ARE 98MM IN HEIGHT..:thumbs:

physco_nutcase_danny
07-06-2009, 12:53 AM
well i stripped all this engine last week...barrell is 98mm.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWNX:IT&item=190303850308 (http://ads.shoppingads.com/pagead/link_0d81ea10249c5efe38ab_7706c7adfb06405510865688 ec60307d_http%3A%2F%2Fcgi.ebay.co.uk%2Fws%2FeBayIS API.dll%3FViewItem&ssPageName%3DSTRK%3AMEWNX%3AIT&item%3D190303850308) 138 barrell.

http://cgi.ebay.co.uk/Motocross-125cc-CYLINDER-Xsport-Thumpstar-Pit_W0QQitemZ190308073193QQcmdZViewItemQQptZUK_Mot orcycle_Parts?hash=item2c4f3ebee9&_trksid=p4634.c0.m14.l1262&_trkparms=%7C301%3A0%7C293%3A1%7C294%3A30 (http://ads.shoppingads.com/pagead/link_0d81ea10249c5efe38ab_7706c7adfb06405510865688 ec60307d_http%3A%2F%2Fcgi.ebay.co.uk%2FMotocross-125cc-CYLINDER-Xsport-Thumpstar-Pit_W0QQitemZ190308073193QQcmdZViewItemQQptZUK_Mot orcycle_Parts%3Fhash%3Ditem2c4f3ebee9&_trksid%3Dp4634.c0.m14.l1262&_trkparms%3D%257C301%253A0%257C293%253A1%257C294%2 53A30) 125 barrell.

THEMOUNTAIN LOOK AT BOTH LINKS...BOTH BARRELLS ARE 98MM IN HEIGHT..:thumbs:

your the dipstick mountain because its quite clear you havnt really looked into this..your just chanting on hear say!!!you need to get your tools out and actually strip one.:icon_lol:

matt132006
07-06-2009, 12:56 AM
the lifan 140 are gen 140cm .. it longer stroke the 125... im pritty sure 125 and lifan 140 pistons r same size:thumbs:

physco_nutcase_danny
07-06-2009, 01:05 AM
the lifan 140 are gen 140cm .. it longer stroke the 125... im pritty sure 125 and lifan 140 pistons r same size:thumbs:

the barrells are the same length.the conrods are the same length.
125 piston is 52.4mm and 138 piston is around 56mm which makes up for the fuel displacement.the stroke of the crank has no effect on the cc as there both the same length.:thumbs:

simms16
07-06-2009, 01:09 AM
just get a bigger engine liam

physco_nutcase_danny
07-06-2009, 01:12 AM
yh i no lol.. im on about 140 barrel and piston.. it longer stroke than 125:thumbs:
matt are your talking about the lifan 140 engine?im talking about the 138cc kit which was posted at the start.:thumbs:

themountain
07-06-2009, 01:21 AM
THEMOUNTAIN LOOK AT BOTH LINKS...BOTH BARRELLS ARE 98MM IN HEIGHT..:thumbs:

this are both thumpstar barrels and the douchebags from petrolscooter measured the sleeves:icon_lol:... this things have nothing to do with the actual Lifan140 barrel we are talking about here!!
thumpstar cylinder--->78mm
Lifan140 cylinder---81mm;)

themountain
07-06-2009, 01:25 AM
..
125 piston is 52.4mm and 138 piston is around 56mm which makes up for the fuel displacement.the stroke of the crank has no effect on the cc as there both the same length.:thumbs:

BUAHAHAHAHA...that made my day!!!:icon_lol::icon_lol::icon_lol::icon_lol::ico n_lol::icon_lol:...you are a true expert...http://www.ruffs-hizzel.com/forumv2/wcf/images/smilies/respect.gif

dannyb
07-06-2009, 01:54 AM
imsure dr pepper didnt intentianally sell you it knowing that it wouldentfit. i think its just a mistake on his part.

katoom
07-06-2009, 06:47 AM
Like simms16 (http://www.pitbikeclub.co.uk/member.php?u=6549) said, just get a bigger engine. The money you spend on a BB kit, possibly a carb, then probably have to uprate the clutch, you might as well sell your lump and buy a bigger one complete.;)

liamisace123
07-06-2009, 08:32 AM
liam send me a pic of the right hand side of your engine then i will be able to tell you if it will fit or not...:thumbs:

here is the whole engine :thumbs:
http://img194.imageshack.us/img194/7416/photo0168z.jpg
http://img195.imageshack.us/img195/2782/photo0166a.jpg

katoom
07-06-2009, 10:53 AM
I'm sure that engine has a 54mm bore and stroke (got 54 in the engine number) but you can't be 100% certain till you strip it down.

I had that engine, the clutch is very light, will probably slip with any increase in power, also the carb is quite small. I just sold my engine and bought a bigger one:D

physco_nutcase_danny
07-06-2009, 12:34 PM
this are both thumpstar barrels and the douchebags from petrolscooter measured the sleeves:icon_lol:... this things have nothing to do with the actual Lifan140 barrel we are talking about here!!
thumpstar cylinder--->78mm
Lifan140 cylinder---81mm;)

this thread is about 138cc kit NOT lifan genuine 140cc barrell.:thumbs:

physco_nutcase_danny
07-06-2009, 12:36 PM
here is the whole engine :thumbs:
http://img194.imageshack.us/img194/7416/photo0168z.jpg
http://img195.imageshack.us/img195/2782/photo0166a.jpg
140 crank wouldnt fit in that bottom end because your clutch is directly attached to your crank.splines different on the 2 cranks.:thumbs:

themountain
07-06-2009, 04:16 PM
this thread is about 138cc kit NOT lifan genuine 140cc barrell.:thumbs:

no the question was if a genuine 140 barrel and piston fit on a lifan125 and it won`t , brother:D;)....don`t change the subject...you were wrong:p

physco_nutcase_danny
07-06-2009, 04:57 PM
no the question was if a genuine 140 barrel and piston fit on a lifan125 and it won`t , brother:D;)....don`t change the subject...you were wrong:p

VERY FIRST QUESTION OF THIS THREAD.

hi were can i get a bore kit for a 125cc lifan engine and does it make it 138cc ?? thanks

WHAT HAS THAT GOT TO DO WITH A GENUINE 140 LIFAN BARRELL?

the bore kit is 138cc different to the 140cc lifan barrell as the stroke of the crank makes up for the cc as its longer...READ THEMOUNTAIN.:icon_lol:

themountain
07-06-2009, 05:08 PM
depends on which bottom end you have....if you have the bottom end where the clutch is attached directly to the crank then the 140 kit wont fit as the little end is too small for the piston.the barrell and head is a straight fit though.so the only way round it is to get a 140 conrod kit pressed onto your 125 crank.you cant replace the 125 crank for a complete 140 crank as it wont fit.the 140 crank is for the gearbox where the clutch is attached via a primary gear.not directly to the crank.:thumbs:

this is your first remark on the question:p...do I miss here something.???...you clearly babble about a "140 kit"...or not..???:roll:...give it a rest now...you obviously don`t remember or know what you are talking about:thumbs::D

physco_nutcase_danny
07-06-2009, 05:12 PM
this is your first remark on the question:p...do I miss here something.???...you clearly babble about a "140 kit"...or not..???:roll:...give it a rest now...you obviously don`t remember or know what you are talking about:thumbs::D

when have i ever said im talking about a 140 genuine lifan barrell?im talking about the 138 kit.did you not see the pics for the 138 barrell and 125 barrell?YOU DONT KNOW WHAT YOUR TALKING ABOUT.

TELL me when you stripped down a 125 lifan and tried fitting a gen 140 barrell and then a 138 kit... NEVER..YOUR FULL OF ****.ALWAYS TRYING TO MAKE OUT YOU KNOW EVERYTHING WHEN YOU CLEARLY DONT...:icon_lol::icon_lol::icon_lol::icon_lol: