Question about 1986 Honda CB 700 SC Nighthawk

2 Answers

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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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
OEM parts for Yamaha
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Oct 15, 2016 | Motorcycles

1 Answer

My bike wouldn't start, changed battery. Went on 80-90 mile ride. Bike would not start. What can I do next?


Hi, Carlos 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.
Good luck and have a nice day.

Jul 29, 2015 | Motorcycles

1 Answer

Bike turns over but won't start


Hi Bestwaytrans, and the usual suspects are:
1. Fuel tank empty
2. Fuel supply valve turned off.
3. Fouled spark plugs.
4. Engine flooded with gasoline as a result of over use of enrichner.
5. Fuel valve or filter clogged.
6. Vacuum hose to automatic fuel supply valve disconnected, leaking, or pinched.
7. Discharged battery, loose or broken battery connections.
8. Loose wire connection at coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, spark plug cable connections loose,
or cables connected to wrong cylinders.
10. Ignition timing incorrect due to faulty ignition coil, ignition module, or sensors " Manifold Absolute Pressure" "Camshaft Position Sensor" "Crank Position Sensor" "Brake Apply Sensor
11. Engine lubricant to heavy ( winter operation )
12. Sticking or damaged valves or push rod wrong length.
13. Primary cam sproket spline sheared or missing spacer.
For a primary suspect please visit the website below:
Good luck
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Feb 02, 2014 | Harley Davidson Motorcycles

1 Answer

Xj650lj having problems with Seca Turbo just got back from a long ride. The ride was roughly 150 miles per day and the bike worked like a top. Got home parked it for a few weeks and now, the bike turns...


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. Fuel line to carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
11. 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.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box if applicable.
17. Tilt sensor needs a reset.
18. Security system not disarming alarm needs a reset.
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.
Yamaha XJ750 not starting
http://en.allexperts.com/q/Motorcycle-Repair-837/81-Yamaha-XJ650-Maxim.htm
Yamaha XJ750 Owners Workshop Manual
OEM parts for Yamaha
http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf

Oct 02, 2013 | 1982 Yamaha XJ 650

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.
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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

I have a cpi sx 50 cc with a big bore kit 80cc i put a new spark plug in and it fires up no problem and rides ok then after about five min riding the bike cuts out and wont start again until it cools down...


sounds like an ignition problem namely the coil or module. you might check to see if these are warm to the touch or hot after riding your 5 min. if so a meter check will determine if replacement is necessary. also check for loose leads anywhere. also make sure your plug is good and the right heat range for the bike. i assume you are saying it quits running but doesnt lock up. if its seizing up then your rebuild kit is likely the culprit and will have to tear it down and check clearances with the rings and cylinders and piston etc. good luck.

Jun 01, 2010 | 2007 Highland Supermotard

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

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