Question about 1986 Honda CB 700 SC Nighthawk

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No power riding bike one day and just started loosing power? checked spark and its good. dont know if its internal and if so what it may be?

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  • kauen Dec 12, 2008

    done, still have same problem

  • kauen Dec 14, 2008

    BIKE WILL RUN BUT WITH NO POWER. DOES HAVE SOME ENGINE NOISE, ALMOST LIKE IT IS NOT RUNNING ON ALL CYLINDERS>

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Being they have hydrolic valve lifters doesn't that mean we don't have to check the timing?

Posted on Jan 19, 2009

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Replace fuek filter!

Posted on Dec 12, 2008

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Posted on Jan 02, 2017

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1 Answer

1989 vmax 1200 back firing at low idle


Hi, Michael 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. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage check for spark leakage in the dark.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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http://www.vmaxoutlaw.com/tech/VMX12-Service-Manual.pdf
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Oct 15, 2016 | Motorcycles

1 Answer

Why dont I have spark? V Star 1100 First lost my keys, had to hotwire bike, (still hotwired maybe this is the fault for no spark?) As the days passed I noticed the bike having more difficulty starting


Hi, Kahmaar nice novella sorry to hear about all your problems that were self-inflicted and yes you may have fried the ECM when jump starting with a running automobile and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting, leaking, spark plug cable connections loose check for spark leakage in the dark.
6. Faulty ignition coil or electronic control module.
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Tilt sensor needs a reset.
10. Security alarm failing to disarm needs reset
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
No Spark Whats Wrong
How to diagnose no spark situation on motorcycle
http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2000/LIT-11626-13-36_96.pdf

Mar 12, 2017 | Yamaha V Star 1100 Classic Motorcycles

1 Answer

Yamaha blaster 2001


No fuel or no spark. Quick test: spray some starter fluid into air intake and try to start it. If it runs and then dies, you've got spark but no fuel. If the bike quit with no prior symptoms, check spark plug wire not knocked loose, fuel filter clogged. (You do have gas, right?)

May 20, 2014 | Sport & Outdoor - Others

1 Answer

Bike not starting


first try a new spark plug, if you get spark check gas filter, have spark ,have fuel, have timing it should start

Jan 05, 2014 | Pit Bike 125cc 4 Stroke Dirt Bike

1 Answer

Was riding the bike parked it went to ride next day.


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, 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.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
ducati 996 wont start
How to diagnose no spark situation on motorcycle
Free Ducati Motorcycle Service Manuals for download
Ducati OEM Parts Fiche Lookup and Online Ordering
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Aug 11, 2013 | 2001 Ducati 996 S

1 Answer

2004 yamaha yz250f ran all weekend then the next day after riding it, it wouldn't start


Hi, Alex 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. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Bike won start just backfires occasionally
Dirt Rider Magazine
YAMAHA YZ250F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Apr 24, 2013 | 2004 Yamaha YZ 250 F

1 Answer

My 2007 650 vstar died while riding it and would not turn over right away once it cooled down it started up and acted like nothing was wrong except for a back fire . Help


Hi, JoAnne 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. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Re 2002 Star Custom Won Start Road Star Forum Yamaha Road Star
Please Help Bike died out while riding
http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2000/LIT-11626-13-36_96.pdf

Oct 10, 2012 | Yamaha V Star 1100 Classic Motorcycles

1 Answer

Starting problems


Hi and welcome to FixYa,

A way to verify start the bike from the cold. Note which exhaust will not heat up after the start (carefully). If the exhaust not heating would be from either cylinders 1 & 4 or 2 & 3, then it would be an electrical/ignition problem. If on the other hand what will not heat up will be the exhaust of 1 & 2 or 3 & 4, then it would be a carb/fuel problem.

Alternately, removed all the sparkplugs, reconnect to the cap and lay on metal part, start the bike. Note for absence or presence of spark on plug ends.

Good luck and thank you for asking FixYa.

Jun 28, 2009 | 1991 Yamaha FZR 1000

3 Answers

New spark plugs last 10-15 minutes of riding


Hi and welcome to FixYa,

Offhand, the only factor to be checked that could foul a sparkplug for your bike would be the 2T oil injector/pump. There is too much 2T oil going to the combustion chamber. Either the injector would require restricting or for some reason, there is also 2T oil in the fuel tank (pre-mix).

Good luck and Thank you for using FixYa. Happy Holidays.

Dec 07, 2008 | 2008 KTM 250 SX

1 Answer

2003 883 sportster wont start


What u are describing is typical of a faulty ignition system, but could also be a fuel problem. I check by removing the aircleaner and rotating the throttle. If u see a nice spray of fuel, thats probably not the problem. Check for a spark at the plugs. I can explain how if you need me to. If you cant see a good spark, U have an electrical problem. I had a crank position sensor go bad on me. Dont do what I did (replaced the battery, ignition, and regulator as part of my diagnosis procedure)

Nov 08, 2008 | Harley Davidson Harley-Davidson Motorcycle...

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