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How to check for spark

Also changed fuse as well drained carby fuel still will not start

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  • Master
  • 408 Answers

Take off the spark plug, plug it into its cap, touch its threads on an engine's bolt and hit the button. You should see spark on its tip.

Posted on Feb 10, 2012

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Posted on Jan 02, 2017

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SOURCE: Carbies willn't set float level,right floods,left sets to low

I don't know if its any help but I've fixed my Honda with similar problem. It turns out I reassembled the rich carbys air cut off valve incorrectly. Have you checked yours? I'm wondering if the cut off valves somehow affect the other parts of the carbys. Mine is running sweet now.

Posted on Apr 24, 2009

SOURCE: honda vt 250 will not start

Hi Dino,
You have sparks and the carbys have fuel in it.......you crank it and it doesn't fire up.....have you tried to use the choke?
After a lot of cranking remove one of the spark plugs and see if its wet with fuel.
I feel probabely the fuel is not entering the combustion chamber.

Posted on May 25, 2009

  • 1 Answer

SOURCE: cr 125, bike will not start after running out of

DEPENDS IF YOU HAVE SPARK OR NOT,IF NO SPARK IT COULD BE YOUR STATOR/ IGNITION, HAS TO HAVE SPARK TO FIRE THIS IS WHERE I WOULD START FIRST

Posted on Feb 13, 2010

  • 58 Answers

SOURCE: Fuel goes from tank to

standard diagnoses procedure - make sure you have good compression, make sure you have spark, make sure you are getting fuel to carby, if you have compression & spark and fuel to carby bowl then you probably have blocked jets in carby

Posted on Sep 02, 2010

kirkx
  • 2019 Answers

SOURCE: hi i have a yamaha

Try some spray starting fluid.
That will prove whether or not the spark if ok.
Make sure there is gas in the carb.
The tank may be clogged or the carb float valve could be stuck.

Posted on Dec 20, 2010

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1 Answer

Husqvarna 18538 engine starts smooth but starts popping like backfiring . Trying to figure it's old gas ? Just serviced the machine.


to most owners a service means change oil. plug ,and clean air filter

drain the fuel tank ..new gas
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undo fuel drain nut on side of carby bowl

popping ....check valve adjustments
if no better
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It sounds like the engine is not getting enough fuel for it to run. First check that you have the fuel tap in the on position. If the fuel tap is on then the carby might be blocked or the needle & seat are not working properly. Turn the fuel tap off. Then take the fuel bowl off. You will then see a plastic float,turn fuel tap on. Fuel then should be flowing from carby. Push the float up and this should stop the fuel from running. Do this a couple of times to ensure that it is working correctly. If all is good after that then turn fuel tap off. Put fuel bowl back on, turn fuel tap on and test. If no luck, turn fuel tap off. Then you will need to take the carby off the motor and clean it using carby cleaner. Be sure to spray cleaner in all holes of carby and blow out carefully with air compressor. Put carby back onto motor and turn fuel tap on and test.

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2002 XR 200 sat for about 6 yrs with no attention. I drained the fuel, cleaned the carb, changed oil, new spark plug. still won't start. what next?


Remove the plug lead and plug. Earth the body of the plug to the barrel. Kick and check for spark.
If no spark you have found a problem.
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I have a yamaha ttr230 and since i have pulled it out of storage this spring it cant make it run right. It starts fine and idles but a soon as any throttle is given it dies out . I have put fresh gas in it...


G'day, sounds a bit like the float valve in the carby might be stuck nearly shut or just some moisture in the carby, a light tap with the handle of a screwdriver on the side of the carby bowl should fix it if it's the needle stuck shut (happens from sitting sometimes), or maybe try loosening the drain screw in the bottom of the carby bowl to drain any water etc out, hope this helps :)

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1 Answer

I have a 1983 suzuki gs 400 e and cannot get it to run i think its the timing and would like any info on how to time it


G'Day jesse,
This model GS has electronic ignition, so there is not much to really adjust for timing side of things. Once set, that is it.

Here are some things you need to check first to see why the bike may not start. I would suggest initially to check that there is spark by removing each plug in turn and check that when being cranked, you have good blue coloured spark. Be sure not keep the plug well grounded when doing this as coil damage can result is you don't get the spark to earth.
If you dont have spark then you need to work out why not. It may be a coil, TCI Ignition module, or less likely inductive pickup sensor. Checking for blown fuses and good power supply to the coil and also to the control module is a good start here.
If you have spark, next thing is to check you have compression. Buy, borrow or steal ;) a compression tester. If need to have at least 100 lb compression for the pick to fire. Check out this guide on compression testing.
If you have good compression, you most probably have a carby problem. Be sure to drain the carbies and tank, fill with fresh fuel before you do anything else, and try starting it again. Carby problems always involves removing the carbies and FULLY dismantling them then thoroughly cleaning all parts, galleries, jets, passageways, of fuel varnish and dirt. Use carby cleaner, and compressed air to blow it all out. Check here for Dans excellent guide to overhauling your carbies.
Always work with a fully charged battery, fresh fuel, and perseverance. you will get there in the end:) I have barely touched on what may be the problem here. More than Happy to talk to you more about this. Good luck :)
regards robotek

Apr 07, 2010 | 1978 Suzuki GS 400 E

1 Answer

Honda vt 250 will not start


Hi Dino,
You have sparks and the carbys have fuel in it.......you crank it and it doesn't fire up.....have you tried to use the choke?
After a lot of cranking remove one of the spark plugs and see if its wet with fuel.
I feel probabely the fuel is not entering the combustion chamber.

May 25, 2009 | 1986 Honda VT 250 F

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