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honda cg 125


Guest paul46
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Welcome to TMBF mate.......pop over to the newbies section and introduce yourself to the gang when you can...... 8-)


How much was the overbore?....did it need an oversize piston? Also check your valve timing and clearances as you'll lose compression if the valves aren't seating fully.......and make sure the head gasket is ok too..... :wink:

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did you use a new gasket between the head and cylinder? have you located the pushrods correctly?have you installed the piston rings correctly on the piston without breaking any as you put the barrel back on these are just some of the reasons you may not have compression

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New gaskets all round, when engine is turning over the valves open and close,

on the n/s of the engine just above the gearlever there is a slotted disc that turns when you remove the long locking bolt, whats it for ??

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That's not the clutch you're looking at is it? A picture would be good...


For compression after a rebuild I'd add checking the head is torqued down right and to re-do the valve clearances as these will have changed with the new gaskets.

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you turned the stator fly wheel. depending on what was attached you may have got the TDC top dead centre back to front.would check the valve clearance first though.

doesnt matter how much the engine is turned on a pushrod engine as the cam has not been emoved from the chain or drive cogs so cam timing will not have altered,you dont need to line anything up on a top end rebuild on a pushrod engine so the problem has to be either compression or lack of spark

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Hi thanks for all replys, but my question is,on the n/s of the engine just above the gearshift,there is a round disc with a slot in it, a bolt locks it so it cant turn,when the bolt is removed the slotted disc can be turned ,i know its something to do with the cam timing, but what ??

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