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Latest discussions at Pit Bike Club:
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27-10-2010, 12:08 PM
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#1
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Join Date: Feb 2010
Age: 33
Posts: 39
Bike: yx 140
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help rebuilding yx140 engine !!
now then ,
id say im a beginner when it comes to rebuilding bikes but im interested in doing this one my self ,
bought a 2008 pit bike ( stomp or thumpstar ? ) last year and it give up on me and has been sittin in my garage for a few months and have finally got round to fixing it , it has a yx 140 engine i think and atm i dont know whats wrong with it .
up to now i have stripped all bits off to clean / replace but i cant get to piston to check it ????
gettin a little bit stuck so if any 1 could help .........
tarrrr
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27-10-2010, 12:29 PM
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#2
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PBC Legend
Join Date: Mar 2009
Location: Bedford.
Age: 29
Posts: 9,674
Bike: D-LINK 160
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Re: help rebuilding yx140 engine !!
take the cam chain off,unbolt the barrel,slide the barrel of the piston.
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27-10-2010, 01:10 PM
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#3
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Join Date: Feb 2010
Age: 33
Posts: 39
Bike: yx 140
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Re: help rebuilding yx140 engine !!
is there anywere i can get a few step by step pics ??
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27-10-2010, 01:20 PM
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#4
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PBC Veteran
Join Date: Nov 2008
Location: Hornchurch, Essex
Age: 34
Posts: 3,848
Bike: WPB 140
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Re: help rebuilding yx140 engine !!
This should help.. 
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27-10-2010, 01:28 PM
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#5
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Senior
Join Date: Jun 2010
Location: Manchester
Age: 31
Posts: 867
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Re: help rebuilding yx140 engine !!
lol that video makes the timing look so easy
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27-10-2010, 02:21 PM
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#6
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PBC Veteran
Join Date: Nov 2008
Location: Hornchurch, Essex
Age: 34
Posts: 3,848
Bike: WPB 140
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Re: help rebuilding yx140 engine !!
Quote:
Originally Posted by Dash
lol that video makes the timing look so easy
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It is! 
Just fiddly.
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27-10-2010, 09:46 PM
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#7
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Join Date: Feb 2010
Age: 33
Posts: 39
Bike: yx 140
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Re: help rebuilding yx140 engine !!
cheers fellas ill have a go , if not ill be back on to you all ..
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25-01-2011, 10:56 AM
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#8
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Join Date: Feb 2010
Age: 33
Posts: 39
Bike: yx 140
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Re: help rebuilding yx140 engine !!
Pistoj fine , all rings fine , barrel fine . Whats next to check ?
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25-01-2011, 02:14 PM
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#9
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Join Date: Nov 2010
Location: Lincolnshire
Age: 29
Posts: 172
Bike: Zongshen 125cc
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Re: help rebuilding yx140 engine !!
Timing spot on? U got a spark?
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21-04-2013, 07:02 PM
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#10
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Novice
Join Date: Sep 2012
Location: norfolk
Age: 48
Posts: 11
Bike: lmx140
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Re: help rebuilding yx140 engine !!
having problems to lookes like ive done it right piston tbc valves closed just wont fire up have ooracing vmr118 flywheel and electrics the flywheel mark is on the t
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