suzuki gs 125 only starts with easy start

[stevenc370]

so I got myself suzuki gs 125 cheap off fleabags for a bit of a project through the winter the guy i got it off said it was sat idling when it cut out snd hasnt started since. I took the carb off and cleaned everything with carb cleaner and still the same. However if I spray carb cleaner into the carb whilst turning it over it will start and idles quite nicely but as soon as I touch the throttle it back fires and cuts out. Any ideas on what could be wrong. I was thinking about buying a new carb but unsure if this would solve it.

[hmmmnz]

valve clearances
do them,

before you do anything else,
do them, do them, do them.
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the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

[stevenc370]

so I did the valve clearance this morning there was minimal adjustment and the symptoms are still exactly the same. I spoke to my dad he reckons could be a tooth out on the cam chain what do you guys think before I pull it in bits to have look.

[unitynotsocri...]

your da may be right ,if so the valves could be kissing the piston.
You could try checking the compression if its a higher milage bike......above 14k.Also check the carb jets are standard and unblocked and the float height is reasonably accurate.It does sometimes happen that the camchain adjuster seizes and can jump a tooth.

another thing to check is the cdi unit for accurate position.
Easy start should be handled with care ,IMHO it should only be used on tired deisels or in an emergency when the weathers freezing and the battery is nearly fckld.

I ve heard stories of people wrecking engines with easy start.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[stevenc370]

how would I go about checking the position of the cdi unit? also how do you set the valve timing I no there's the marking on the crankcase and flywheel for tdc but is there a marking on the cam shaft or top end of the engine. Thanks for the help

[unitynotsocri...]

theres usually a mark on the camshaft sproket and a T mark on the flywheel . If the cdi has been moved it would be unusual .

One way to check is to find TDC ...top dead centre and check the the top of the valve springs and make sure they are not opening any of the valves..........soz........check out RV125 timing on BCF old thread
.
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nearly a normal tax paying tosser.......with ferrileness suzi100,cg125,cb125scb100n,cb175,cd100,cj250t,kh250,c15,125 bantam,super 6,rickman gs750,xt500,250rs,dt175,lifan125,dolomite1850,metro,Morris220ld,morrisfg,leyland princess,range rover,corsa,vw camper .now struggling with legs. MORE ORDER = MORE CHAOS

[stevenc370]

Back in the shed it is then. Thanks for the help.

[stevenc370]

so I've started doing the valve timing this morning set the marks all up as it says in the manual span it round a few times by hand with the rocker cover off to check the chain wouldn't slip all seemed well then but it all back together checked by hand again and the piston is hitting the valve. where did I go wrong? The marks still all line up?

[bradh511]

The rocker covert has the tappet arms inside so you can spin it over all you want won't do anything ie open valves till its back on you may have set it 180 out?
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Theory 11-10-12 lets hope i get mod 1 and 2 done by the 18th of jan 2013

[bradh511]

By this i mean the cam locating stud is facing up when cam marks appear flat with head...and lobes appear to have no lift if you catch my drift
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Theory 11-10-12 lets hope i get mod 1 and 2 done by the 18th of jan 2013