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Stripping the 125

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bulldog93

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Tools used:

- Small socket set 8mm-14mm
- Circlip pliers
- Flywheel, clutch/oil slinger puller
- Needle nose pliers
- Small spanners or shifter
- Phillips head screwdriver, Flathead screw driver
- Impact srewdriver

And a few other tools. I'll add as I remember.

The Head​

Steps:
1) Take off the timing chain cover. 1 X 10mm bolt.
2) Take of the timing chain sprocket. 3 X 9mm bolts.
3) Take off the front plate that hides the rockers and cam. 4 X 10mm nuts.
4) Take of the side plate off that conceals the rocker pins. 2 X 8mm bolt.
5) Separate the head from the barrel. 1 X 10mm/Phillips head bolt.
6) Take the intake and exhaust valve covers off. 2 X 8mm bolts each.
7) Loosen the valves off. Take out the rocker pins with needle nose pliers or circlip pliers.
8) Push the cam out towards where the cam sprocket was.
9) Take out cam chain spacer. 1 X 10mm bolt.
10) Separate barrel from block. 1 X 10mm/Phillips head bolt.







 

bulldog93

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The Stator

1)Take of the sprocket cover.
2)Take of the nut that’s holding the flywheel on (1 X 14mm nut).
3)Insert the larger bit of the flywheel puller into the flywheel thread ( left hand thread) then add the bolt into the large bit (right hand thread), keep on tightening until you see it move towards you.
4)Take out the two (2) Phillips head screws, might need the impact screw driver.
5)Take out the two (2) o’rings that are placed in where the two (2) screws use to be.






 

bulldog93

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The block
1) Take off clutch cover. 8 X 8mm bolts
2) Take off the front clutch plate. 4 X Phillips head bolts, use impact screwdriver
3) Knock down the locking tads that hold the clutch nut in place. Take off the nut with the clutch/oil slinger tool from DHZ.
4) Slide off the clutch.
5) Slide off the cog that is behind the clutch, Watch out for the sleeve that fits into the ID of the cog.
6) Take off circlip that holds on the primary starting gear and slide off
7) Take off the gear selector star. 1 X 10mm/Phillips head bolt.
8) Slide the gear selector shaft out.
9) Takeout the flywheel side bolts. 7 X 8mm bolts
10) Split the casings.
11) Undo the gear selector bolt on the sprocket side. 1 X allenkey bolt.
12) Take out gearbox and gear selector.
13) Release the cam chain tensioner. 1 X 14mm bolt.
14) Press out crank.







 

sean01

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top work BD.
also the removal of the top end, timing setup and magneto is exactly the same for ALL crf style engines..yx/lifan/loncin/ducar/jialing 50cc,70cc,90cc,110cc,125cc,138cc,140cc and 150.

also if you plan on refitting the head then pull the engine apart on TDC..
 

DvDRip

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yea I'd have got it to TDC before pulling it apart ... and cleaned it! poor motor I never seen one so dirty especially mud all over the magneto coils :eek:
 

bulldog93

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bulldog
whats that lil allan key bolt there in the the 1st pic??
First picture of ,y last post is the allenkey bolt that holds the gear selector on.

I put it on TDC when I did it. Didn't think to put it in though. Yeah thats nothing. When I pulled the clutch cover off there was all this little black plastic bit??

Cheers boys. I need to re-size photos though. Haha.
 

sean01

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all your pics show the cam 180 degree's out BD, thats why i mentioned it..

and yeah now i see the allen key he's talking about... this holds the gear drum assembly in
 

DvDRip

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ok so piston was TDC but yea as sean said the cam was not... need another rotation of the crank next time ;)
 

mikewayne

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Great post ...
especially the explanation in the picture format which has made it pretty much easy for all to understand, it could have been even better if you could have put the explanation along with specific images as it would have made it is to link the images along with the process.
 

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