Question about 1979 Yamaha XS 650 F

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No spark bikes ben in shed 5 years tried starting it but have no spark cleand plugs and points and checked wires

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If you cleaned and set the gap on your points check and make sure the you are getting power up to the points follow the path with your test light.
Power at points?
NO= follow the path to what every is not letting the power pass, fuse, broken wire ect..
YES = power out to coil?
NO=something is wrong with points may not be closed spin motor slowly stil nothing check that they are closing
YES = dose your test light flash when you spin the motor with test on the power wire at coil
NO= points are not opening adj and try agine
YES= change cond. and check for spark
Good Luck
C.C. Motorsports

Posted on Feb 01, 2010

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Quad bike will not start

follow this steps and fix it. God bless you
  • Make sure the key and kill switch are both in the "on" position. Ensure that the proper starting procedures for your bike are followed. Is it in neutral? Clutch pulled in? Gas in the tank? Then try to start your bike. Does it turn over? If not, check to see that the battery is properly connected and the terminals are not corroded. If they're loose or dirty, clean and tighten them. Then, using a voltmeter that measures ac/dc and ohms, check to see that your battery has enough charge to crank the engine. If not, replace or charge your battery and try again. If it still doesn't turn over, there may be a loose connection between your battery and starter; a bad ignition or starter switchl or a bad safety relay. Check a repair manual for proper testing procedures for your bike, as each motorcycle differs.
  • 2 If your bike turns over but doesn't catch, check to see that it's getting fuel. If the bike has a fuel petcock, make sure it is in the "on" (or, on certain bikes, "prime") position. Then remove the main fuel hose and check to see that fuel is flowing freely. If fuel isn't getting to the carburetor or injection system, your bike won't run. If that's the case, your problem is likely something in the fuel system. If fuel is flowing freely, reattach the lines. If it's not, check to see if the fuel filter is clogged, if a line is pinched or if the petcock is working properly. One way to determine if the problem is in your fuel system is to put a few drops of fresh gas into each spark-plug hole, replace the plugs and turn the bike over. If it starts and then quits, the problem is likely in the fuel system.
  • 3 If you're getting fuel and the bike turns over but still doesn't catch or start, check the spark plug or plugs. Start by pulling off a spark plug wire, then removing a plug using the spark plug socket supplied in your bike's toolkit. Now inspect the plug. It should not be wet (usually caused by fuel, when the plug is not firing) or coated in carbon/burned oil deposits. Now check to see if the bike is getting spark. Although you can get a special, insulated set of pliers to hold the plug, there's a "quick and dirty" method for this: After reattaching the plug wire, lay the threaded part of the plug against the engine (not over the plug hole, as the spark could ignite any fuel that is blown out when you try to start it). Now, making sure you're not in contact with the engine or plug, hit the starter. You should see a nice blue spark. If you don't, make sure the threaded portion of the plug is touching the engine (but the electrode is not) and try again. If you still don't see a spark, you either have a bad plug or a problem with the electrical system. Check to see that all the ignition wires are properly connected and that you can't see any cracks in the wires. If the wires are cracked, they should be replaced. If you're still not getting spark, it's time to consult a repair manual or call a mechanic.
  • 4 If you've got fuel and spark, ascertain that your bike is getting enough air. Start by pulling off the air filter. If it's too dirty, you won't get the proper mixture of air and fuel in the carburetor or injection system. If it's clean, check to see that the air box is properly connected-- a loose hose or air leak can feed too much air into the system. If your bike is equipped with a choke, ensure that it's able to move freely and is not stuck in the "on" or "off" position.
  • 5 If you've followed these steps and still can't get your bike to run, call in an expert. If you think you've narrowed down the source of the problem, describe the steps you've taken to point the mechanic in the right direction.

Nov 21, 2013 | kawasaki Sport & Outdoor - Others

1 Answer

My dr 1990 model wont fire

try pulling the plug, stick a screwdriver in the end of the spark plug wire and hold it to the metal of the bike try starting it if it has fire you wil get a spark. if no spark try checking the points they may have burned out
... good luck

Jun 02, 2012 | Suzuki DR 750 S Motorcycles

1 Answer

Hi ive just got a cb900f2 boldor. It has been in a shed for 5 years, previous history unknown. The seller has put new plugs and carbs on it. It will whind over but no spark at plugs. I dont know alot...

pick ups work similar to points
The coil needs power, when the points open the coil field collapses and it sparks
With pickups they trigger the electric igniton box to do the same job as points.
if you have power to the coils, when you touch a pick up with a screw driver it should trigger a spark.
You dont often get two coils fail or two pick ups fail simutanously, but a faulty ignitor box will stop all spark.

PS (not ignition related)Check the rivets in the wheels if it has them

May 09, 2011 | Honda CB 750F2 Seven Fifty Motorcycles

1 Answer

2003 harley sportster. my bike starts and runs for about 5 min then dies and wont start back up. ive checked and am loosing spark. after it sits for awhile it will start but then dies again 5 min later....

Your bike is not equipped with points. Harley stopped using points in 1979. What you have is a solid state ignition unit and the flashing light is used to time the ignition with. The number of wires and where they should go is dependent upon what type of ignition unit you have. If you can see the unit, it should have a name and model number on it.

Here's a test. Start the bike and allow it to run until it shuts off. Pull the spark plug wire and put another set of spark plugs in them and lay the plugs against the engine so that they get a good ground. Turn the ignition switch on and then back off. Watch the plugs when you turn the switch off. You should see a single spark. If not, your coil is probably bad. If you see the spark, the coil is good.

To test the coil, take all the wires off the small terminals of the coil. Use an ohm meter and put the function switch in R X 1 scale. Measure the resistance between the two terminals. You should read between 2 and 3 ohms of resistance. If it reads any higher than this, the coil is bad.

If the coil checks good, then the problem is in the solid state unit in the timer cavity. If it's an aftermarket unit, you'll have to send it back to the factory to see if it's bad. If it's an aftermarket unit, you can go to their website and look up the technical information and installation instructions for the unit using the model number.

Good Luck

Apr 25, 2011 | Harley Davidson XLH Sportster 883 Hugger...

1 Answer

Xs750 what is the firing order

There is no firing order. Your bike has a coil that fires on both the compression stroke and the exhaust stroke (also called a wasted spark). Therefore either plug wire can go on either cylinder and the bike should run the same.On four cylinder bikes this meant that you could run four plugs using only two coils and two sets of points instead of four coils and four points.If the bike is running poorly try new spark plugs and new spark plug caps first(start with the cheap stuff). Next check the actual coil and pulse pick up or points. You may have to replace the coil only because the wires are cracked shorting.

Jul 25, 2010 | 1979 Yamaha XS 650 SF

1 Answer

Bike dont start. Yamaha 175 CT - 1973 make.

Firstlly have you a spark at the plug.if you have no spark then it may be your points or even the timing may be out .

Mar 10, 2010 | 2004 Sym Husky 125

1 Answer

Wont start up. seems electrical 1975 Yamaha dt 400 What should I check?

check for spark at the spark plug.. if no spark at the plug check the coil for spark where the plug wire plugs into the coil. that bike probably has points. check the points gap.

Dec 12, 2009 | 1974 Yamaha DT 360

1 Answer

I tried to start my '85 kawasaki 454ltd for the 1st time this

Sounds like a bad CDI box. That is part of the ignition. Do you use a fuel stabilizer when moth balling your bike each year? That may have been part of the backfire and shut off. Your bike having carbs may have gummed a little. Are you handy? Try spraying a small shot of starting fluid in the air cleaner,small shot! Just to make sure it's not a fuel problem. Try a different plug in the wire also. Sounds weird,because I'm pointing out fuel starve problem but the plugs could be fuel fouled. Anbd a new set of plugs for that bike shouldn't be that expensive and a good place to start.

Jul 12, 2009 | 1987 kawasaki VN 750 Vulcan

1 Answer

1999 TTR 250 Wont SPARK...

have you replaced the spark plug it may be stuffed

hope this helps

Jun 18, 2009 | 2002 Yamaha TT-R 250

1 Answer

Non starting speed triple


Offhand, the only and remotely possible explanation for the extraordinary disparity in the compression is when the bike was driven long and hard, parked, engine switch off without allowing for slow cool down with engine running and/or the right side was with doused with water.

Of course, if your posted readings would be confirmed, then the engine has to be worked on, a major overhaul. Perhaps it would be to your advantage if you can have a second opinion and/or a second compression test.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Nov 17, 2008 | 2005 Triumph Speed triple

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