Yamaha SR 125 not starting.

[Joshua18]

I recently got given a Yamaha SR-125 from a family friend to work on since it has just been sitting in his garage for several years. We knew the bike is going to need a lot of work. We bought a new battery, changed out the fuel and switched the spark plug. The bike is turning over but not starting.

The following is the video of me trying to start the bike.

[Easy-X]

Basic checks:

Have you got spark? (i.e. take the plug out and look!)

Have you got compression? (compression tester or at the very least thumb over the spark plug hole)

Have you got fuel? (Does the spark plug smell of petrol)
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Joshua18]

Everything checks out apart from the spark plug smelling of fuel. The fuel is coming out of the tank but im not sure if it is going into the engine.

[Easy-X]

Might be the old fuel has clogged up the carb, worth a go cleaning that up.
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Joshua18]

I cleaned out the carb and got it running with a push start. The bike hasn't been run in 18 years so im not sure if i got to keep push starting it but it starts but then dies after almost immediately after.

[BusterGonads]

Try a spray of damp start into the air cleaner or air box opening and if it starts and runs on the starter for a moment or two, you know you have a problem in the carb.

It is possible that you have a spark issue, but since it does run and then dies, my betting is on a blocked jet or sticking needle valve.

The fact that it has stood unused for so long would tend to create gum in the carburettor. It should be easily sorted out and I bet you'll have a nearly new motorbike. Good luck.
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2016 Triumph Street Twin; 2000 Honda CG125; 1997 Honda Nighthawk CB250

[Monkeywrenche...]

Easy start, not Damp start
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2001 Aprilia RSV Mille R -dead, 2016 XSR 700-gone, 2018 Dorsoduro 900

[Teflon-Mike]

DO NOT use easy-start/damo-start... stuff is basically ethanol. and it washes the oil off thhr bore so the bore wears out toot-sweet, and the engines become dependent on the stuff as they lose compression.

starterr sounds lazy in vid ; - get the plugf out put a teaspoon of TWO-SROKE oilm or chip fat veggie oil down the plug hole.. leave the plug out, go heck/charge the battery, and whiolst that tops, work the mnotor over on tyhe kicker or a bump NOT trying to start itm just work the opilo into the bo9re where EZ-start has washed it away.

Tjen cleam the guel petcock filter, make sure petrol fresh and petrol tyanbk clean... nd with full chafge in the battery try again... briefly DO NOT run the starter for preolonged periods and wear out the brushes and bearings... if still no go.. sartar ther, recom the starter and solenoid anmd get the motor spining up to full speed on the button... remember NO Etrher and a little vegie oil or 2t down the bore rto luybe rings and stop that wering out and gettinmg te compression up a bit.... 2T nd vbegie WILL burn off when engine fires properly, so be prepared to change the plug when you done, and cleanm the one you got a few rimes whilst farting about.... bey9oind that get the workshjop manual and do #ALL the basic service stuf, itr' oft gets neglected por donme badly, so do it, do it right and be sure the motor s trip-top a it should be before you go looking for problemns like knackered bore or furred up piston rungs that are pronbbabloyt on the cards begg9nb a top emnd rebuilpd now 0or pretrty soon anyway.... your call if you cut t9 the chase and do that now as a precautionary or hope for the best abnd likely do it in a thousand miles or so after lots of effiung....
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My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'

[Ste]