Question about 2001 Yamaha YZ 426 F

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Spark plug constantly fouling is very hard to start whenhot always having to clean the plug in order to get bike to start. when it wont start there is no fire or backfire from the engine at all its like its completely dead

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Ken Fowler

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Too much fuel. Adjust float level in carb.

Posted on Feb 07, 2011

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1 Answer

Spark Plugs Fouling


this might b out of price range but new carbs and electronic ignition will still have to tune also, or get the carbs ultrasonic cleaned then set up to factory specs will be a good starting point

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I have a aprilia mojito scooter 50cc it start ok but when i ref it it cut out straight away and they hardly no power when i set off ?


Check the spark plug is clean and gapped. Aprilia is a high performance bike and the spark plug does tend to foul up.
If the plug is clean check that the fuel is reaching the carburettor ok.
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2008 dr-z400sm. Always started first time, no problems. Bike has not been used for 3 weeks, battery has been on trickle charge. Bike will not start on choke, battery is fine, is it the carburetor - do I...


When not using your motorcycle on a regular basis, always put some fuel stabilizer in the gas. If the gas seems stale drain the tank and mix the old fuel with good fuel by in your automobile or lawnmower and burn it there (no waste). Put fresh fuel in the motorcycle tank. Try draining the carburetor bowl, pull the fuel line off at the tank, put a squirt of carburetor cleaner down the fuel line. Chevron Techron is an excellent fuel additive for cleaning up a gummy carburetor. Be sure and check the the spark plug in the motorcycle is sparking and not fouled. If you check the spark plug for spark right before you are going to try and start the bike, put an eye dropper full of gas into the spark plug hole right before you screw the plug in to prime the machine.

Nov 03, 2010 | 2007 Suzuki DR-Z 400 SM

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Right hand cylinder on my rd200 not firing properly, the bike will run, starts perfect, exhaust gets warm on right hand side but no power to ride, any ideas?. have put in new spark plugs, leads and caps,...


Assuming you properly cleaned the carburetor low speed circuit.check the list below.
1.Check the compression on the right hand cylinder.
2.check your points,pull the point cover off start the bike and watch the points if you see bright sparks at the contact point the condenser is is bad.
3.If your constantly getting an oil fouled plug the right hand crankshaft seal is leaking transmission oil into the crankcase.
4.check your fuel flow from that line to that carb.
Hope this helps you determine whats going.


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I have a cheetah 200 motor bike and the bike wont run i had it running on the weekend for about five minutes and then it stalled and now it wont run at all what do you think the problem could be


your carb could need cleaned, do you have spark, is your spark plug fouled? does it have compression to make it run you need compression, spark and fuel. check that, if your missing one of then thats where you need to start.
Mark
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1991 300 zx tt fouling 1 plug but compression is good


It may have a poor spark on that plug, or it may not be getting a constant spark from the HT lead, check the ignition system in reverse order from that plug. Could also be a valve sticky, periodically cause the fouling of the plug or it may be the oil rings starting to fail on that pot.

Hope this helps.

Jan 20, 2010 | Nissan 300ZX Cars & Trucks

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I have the Suzuki GS 750E, the spark plugs are constantly becoming fouled, how do i correct this problem


sounds like its running to rich, check your air filter is clean, set your carb mixture ,
turn the screws in untill they bottom out ,but dont turn to hard !(they have a fine needle point end and are easy to break leaving the broken point inside the carb making adjustment impossible )back all four screws out 1.5 turns and start from there.run the bike and adjust from there to rich turn out to lean ( weak turn in )

www.thegsresources.com a good web site for these bikes.

good luck

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Get some engine starting fluid and spray a small amount in the air intake. If that doesn't work take out the spark plug and see if it sparks when you pull the cord and make sure it is not fouled. If it is wet with fuel dry out the plug and pull the cord a few times to clear the cylinder. Fresh premium fuel always works best on temperamental engines.

Sep 06, 2009 | Quad 47 cc / 49 cc Pocket Mini Bike...

1 Answer

My yz wont start, changed spark plug it ran for 1/2hr then died


Couple things- 1. If the plug was dirty after 1/2 hour you have either the wrong heat range plug(too cold) or 2. a fuel/carb issue. Buy a hotter NGK plug, ask for help the numbers don't always make sense. Use only full synthetic 2 stroke (I always liked bel-ray) and fresh 93 octane fuel. When you find a plug that works good buy a case of them, 2 stokes will foul plugs period. And some advice with your solution, never head into the woods without a spare plug, they will foul at the absolute worst time.

Don't forget to rate please!

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