Question about Yamaha Road Star Midnight Motorcycles

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My bike keeps cutting out and loosing power ad carb off still same new spark plug still same

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If its a 2 or 4 cyl....are you losing ignition on one or more cylinders? Sometimes the ignition components fail when they heat up, but test fine cold.
If your bike has pickup coils (located next to stator in left crankcase cover) test the resistance cold and then once it gets hot.

Posted on Apr 05, 2011


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Bike is cutting out when trying to give it gas going down the road

which means the spark is breaking down on load conditions, probably idles just fine right? Check the spark plug for hot purple spark. other thing it could be is loose rubber boot between carbs and intake manifold. When you boot it the extra suction could be letting air sneak into engine without going thru carbs and having gas mixed in.

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Yep, clogged fuel filter, dirty carb. ????

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1987 harley davidson 883 sportster will fire but does not stay running

Hi Shane, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
Good luck

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My honda cbr 125r 2007 keeps cutting out its not the spark plug as its new please help

double check your electrics, probably a loose plug somewhere. Possibly even a fuse that's only half in or a loose connection on your battery

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I have a ccm r30 644 2004. The bike will not start i am getting fuel to the carbs but i presume its not going through to the head. I have taken spark plugs out and checked them i have also added a little...

dump the float bowels and inspect/ clean as necessary. consider buying an acid bath solution sold at your local parts store just for this sort of thing or carb cleaner and a toothbrush. you may need to clean your current/ buy new jets for your carbs. just try spraying starting fluid into the carbs while starting the bike by removing the air filter first and try to keep it going as long as possible this may get the juices flowing on its own. goodluck

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Suzuki TS125R (1994 model), not TS185: Trouble starting

I have same problem with my ts 125r i solve problem with new spark but not NGK BP9ES i put another spark plug am not sure about her name i thik its Golden Wathes with four pips.U must measure leght and widht for this spark plug and heat power. Peace

Apr 09, 2010 | 1981 Suzuki TS 185

1 Answer

Motorcycle cuts out and backfires when accelerating. black smoke puffs out when backfiring

I need more information. Is the bike carburated or fuel injected? Did it just start this or has it been doing this for a while? It sounds like either an ignition or a fuel problem.

If it has a carb, I'd say that it's jetted way too rich or the main jet has come loose in the carb maybe. Tell me what kind of carb is on the bike if it is indeed carburated. I need the year model of the bike and the name of the carb on it. Maybe I can tell you how it's supposed to be jetted. If the main jet has come loose, you will lose control of the amount of fuel going into the engine at wide open throttle.

You may have a bad spark plug as well, either get a new set or have the ones you're running now cleaned. When you pull them out, look and see if they're really black and sooty looking. This is indicating a rich mixture. Check your spark plug wires and make sure they're in the coil correctly. Check of loose connections at the coil primary (small wire connections) connectors. Make sure that chrome cover over the coil is not loose shorting out the ignition.

Fuel injected, I can't help you with that as it takes a special device to make any adjustment in that system.

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I have problem starting my xr 250(enduro)getting good spark plenty compression,fuel getting thru and carb all clean, ?? have changed cdi unit(original duff) but it was off mtx 125 but gives good spark,...

If you are getting gas than you have an air leak somewhere between your carb and the head. When the bike is ideling take a can of wd-40 spray slowly around every possable connection. ( rubber boot & where it bolts to the head ) When it sucks in air and wd-40 it will speed up and reveal the air leak. The boot itself could have a crack in it.

Oct 13, 2009 | 1990 Honda XR 250 R

4 Answers

My 50cc mini bike starts then dies 5 secs after starting. why?

It sounds like you may have 2 problems

  • Bad gas
  • dpossible loose spark plug( bad compression)


dump out the gas put new in
Remove the spar plug and examine the plug if it is wet and black it is fouled
if it is white ad dry it is not getting gas

If you can replace the spark plug if not just clean it with a wire brush put back in and tighten

Finally make sure the spark plug wire is not lose

Best of luck to you

Jan 01, 2009 | Mini Motorized Bike

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