Question about 2004 Skyteam ST 125 Y

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Starting is a problem uses 1 plug every week and backfires

My bike is 125cc and i have had it for 1 year. it uses plugs alot and after a few days they don't work at all.the bike can not go full speed and it uses alot of fuel.

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Your engine seems to be "flooding". Check operation of choke, ensure it's not remaining on. The air cleaner may be clogged, replace if suspect. Refer to owner's manual (or local dealer's data) for correct sparkplug range applicable. Check condition of the plug lead caps, ensure good contact with plug. Carburetor pilot and main jets may be worn or damaged, try one size lower. Take sparkplug out and turn engine over with kickstarter till engine is Top Dead Centre (see timing mark on magneto) poke your finger in plughole for a good seal and turn motor over till suction is felt on finger, hold there to guage compression of engine. It should **** air in when you take your finger off even after 10 seconds. If bad response, a Top end service may be required to get valves doing their best, good time to check clearances and condition of piston/rings.

Posted on May 01, 2010

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You have to find a hotter plug or try and lower the voltage of your bike, which is next to impossible. But it can be done. the old cars had a voltage reducer on the coils, and when the car wouldn't start, you just jumped the wire on the reducer and off you went with a ton of power, unfortunately, the coil couldn't take the heat and would die in about 20 mins anyway. But the plugs, I had to switch to autolite on my bike , they work 10 times better than champions, NGK are about the best, and they have a good heat range.Check them out.

Posted on May 01, 2010


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I put a new carb on my 125ssr pit bike and it ran great for a week.Now it starts on first kick,idles fine,but bogs and backfires when given gas.I've checked the jets,needle adj.,timing,valves,wiring.

Hi, Ralph my guess is the reason you replaced the carburetor is still there unresolved and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
3. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking.
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
SSR Dirt Bikes Parts
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1 Answer

125 Pitbike keeps fouling spark plugs

Hi, Damon and the usual suspects are:
1. Dirty air filter.
2. Fuel mixture too rich or the choke has been left on too long.
3. Faulty spark plug.
4. Incorrect spark plug heat range for the engine type or service.
5. Piston rings badly worn or broken.
6. Valve guides are badly worn and/or seals worn, crushed or have come off the valve guide and are pumping oil through it.
7. Spark plug cable weak or leaking check for spark leakage in the dark.
8. Faulty ignition coil.
9. Low RPM nonaggressive riding style.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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1 Answer

Week spark

you need a bit more lead
quick get you out of trouble gadget
get a lead pencil and go over all the electrical connections
including your spark plug
then check your cdi, cdi pick up, coil, lead and spark plug
the coil lead may need cutting back about 10mm

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1 Answer


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Last time I STARTED MY VSTAR 1100 I CHOKED IT FOR 10 SECONDS ON HIGH THEN MOVED TO MEDIUM CHOKE FOR 4 THEN TOOK OFF AT NO CHOKE. 2 WEEKS LATER. I started up bike Choke on high bike barely wanted to idle...

Sounds like your flooding it out with the choke out. Try the next time you go to start the bike when it's cold with the choke out and when it starts push the choke all the way in and keep it running with the throtle. If it runs better after doing this then your flooding it on start up. Use 1/2 choke to start cold and see what it does. Good Luck

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