Valve clearance troubles CG125

Falco · Traffic Copper Joined: 27 Nov 2015 Karma :

I was hoping to check my valve clearances today, but have run into a problem. The rocker arms won't move. I have turned the engine over several times but there is still no movement. Am I missing something? Does this mean there is no valve clearance? Or something else entirely?

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

The clearence will be in the order of hundreds of a millimeter so there would be little or no appreciable movement. There is a possibility that the clearence is too small, in which case you should undo the nut of the adjuster and turn it back slightly until you can just get your feeler guage in with a little drag. If the feeler guage is opening the valve, the clearence is too small.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

Falco · Traffic Copper Joined: 27 Nov 2015 Karma :

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Look at the cam, you can see a lobe on it. You want to make sure the rocker follower is on the part of the cam furthest away from it.

Then take out the spark plug and using something of a suitable length (not only an inch!) check that the pistion is at the top of the stroke. Move it forwards, backwards to adjust. I always used to use a screwdriver but you have to be sure that you don't damage anything inside with it.

Do not drop anything down the hole as you'll have to strip the head to get it out!
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

https://hondacg125.awardspace.com/valve_clearance.htm
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

monkeybiker · World Chat Champion Joined: 23 Sep 2014 Karma :

Falco · Traffic Copper Joined: 27 Nov 2015 Karma :

Many thanks Nobby, all sorted now, after a bit of faffing.

MCN: Yeah, I was using that, but the photographs are too low rez to make out what was going on (and I didn't realise how little the rocker arms would move.

monkeybiker: I have the Haynes Manual, in many respects it is excellent but for valve clearances it is total trash.

Falco · Traffic Copper Joined: 27 Nov 2015 Karma :

I also noticed a couple of other things while adjusting the tappets;

-there was a larger gap on the outer edge of the tappet, nearer the case (I took a picture but it is too blurry to see what I mean Embarassed

). Is this a sign of wear?

-one of the rocker arms moved back and forth along the bolt it pivots on very slightly. Is this a problem? Something that needs fixing/replacing?

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

Falco · Traffic Copper Joined: 27 Nov 2015 Karma :

hondakawasaki · Nova Slayer Joined: 03 Jan 2013 Karma :

turn the stator counter clockwise untill you see the valve closest to the carb go down then line up the t mark on the stator Thumbs Up

Nemo · Could Be A Chat Bot Joined: 30 Apr 2010 Karma :

It doesn't matter what stroke the cylinder is on, as long as the cam is in the correct position to take a clearance, half the time it doesn't even matter if the piston isn't perfectly top dead centre, as most manufacturers just do it on the opposite side of the lobe.
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Previously owned: Kawasaki KH125, Suzuki GP125, Suzuki GX 125, Honda CB125 TDC '83, Honda ntv 600, Kawasaki ER5, Kawasaki ZZR600, Aprilia RSV 1000 Mille
Now own: Ducati 848 evo