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1978 Yamaha dt100e got spark got fuel won't start backfires

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  • 179 Answers

Timing is still not correct. Needs further adjustment.

Posted on Apr 08, 2015

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: 2001 yamaha Grizzy 600 not getting gas

Hi Daniel,
Check the ignition coils.

Knight. (yamaha seca XJ750A 1981)

Posted on Feb 12, 2009

  • 163 Answers

SOURCE: 1978 YAMAHA RD400E NO SPARK ON ONE CYLINDER BIKE RUNS ON

Hello,

Remove both sparkplugs from engine. Plug them back in the sparkplug cables and let them rest on the engine.
Make sure your battery is well charged.
Check for sparks while kick-starting...
Interchange the sparkplugs in the cables:
-Same plug give sparks: replace the spark plugs.
-Same side of engine sparks: interchange the low-voltage connector at the ignition coils.
Give it a try:
Same engine side sparks: Replace the defective ignition coil.
Other side of the engine sparks: Check the circuit harness for loose connectors, and/or Clean-replace the breaker points ( left side of the engine carter ).

Posted on Aug 29, 2009

  • 308 Answers

SOURCE: My yamaha raptor has power,

Check the compression, pull the spark plugs one at a time if more then one. If you don't have a compression gauge, you can put your figure over the spark plug hole, be mindful that before it blows it's going to **** so make sure that you don't hurt yourself leave a little gap so your figure doesn't suction down to tight. If your getting compression it should **** and blow pretty hard. If it seems to have good pressure and suction. You might need to check your timing, also make sure that you can feel air moving out the exhaust, might not be able to with the pipes on it but if it won't start and your getting everything else it needs to run gas,spark, etc. It has to almost be timing or compression.

Posted on May 15, 2011

  • 10 Answers

SOURCE: my yamaha v-star won't start

Have you cleaned the Fuel tank recently? some times even under excellent care you can get gunk built up. also have you checked spark plugs

Posted on Jun 09, 2012

  • 51 Answers

SOURCE: my 1987 yamaha razz riva scooter won't start and it;ll backfire then almost start then nothing?

take out the spark plug and clean it or replace then check the gap

Posted on Jun 13, 2012

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Won't start just backfires


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 CDI box.
Spark plug cables in bad condition and shorting check for leakage in the dark, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty MAP, CKP, O2, TPS, sensors.
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box.
17. A stuck bent or burnt valve.
18. Tip over sensor needs a reset.
19. Check for engine trouble codes.
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.
https://yamahaclub.com/forums/topic/23165-custom-1981-xs400-special-wont-start
Won start backfires
Yamaha XS 400 SH Service Manual ENG XS360 2D XS400 2E 2F SG Supplement ENG...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Jul 13, 2014 | 1984 Yamaha XS 400 L Maxim

1 Answer

Won`t start and backfires with throttle or choke


try cleaning carb and running ethanol free fuel with injector/carb cleaner in it

Dec 22, 2013 | Yamaha Kodiak 400 Auto 4x4 ATVs

1 Answer

Will not start backfires thru exhaust


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 CDI box.
Spark plug cables in bad condition and shorting check for leakage in the dark, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty MAP, CKP, O2, TPS, sensors.
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box.
17. Tip over sensor needs a reset.
18. Check for engine trouble codes.
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.
http://www.r6-forum.com/forums/58-exhaust-fuel-delivery/135499-2000-r6-backfireing-through-carbs-wont-start.html
Won Start Just Turns Over And Backfires Fixed
1999 2002 Yamaha YZF R6 Service Manual R6 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Dec 07, 2013 | 2000 Yamaha YZF-R6

1 Answer

1995 yamaha vmax 600 backfires wont start


if it is backfirering sound like timing is out of spects

Feb 16, 2013 | Cars & Trucks

1 Answer

Vespa P150X Piaggio won't start


i think it is the CDI-box (at the top end of engine) not working.
check the connectors (pull the rubber cover)
- or better get a new onevespa-p150x-piaggio-won-39-t-start-gfszydzqc2hzsk2kh2zz143u-1-0.jpg vespa-p150x-piaggio-won-39-t-start-gfszydzqc2hzsk2kh2zz143u-1-2.jpg vespa-p150x-piaggio-won-39-t-start-gfszydzqc2hzsk2kh2zz143u-1-5.jpg

Jan 03, 2013 | Peg Perego Vespa Scooter

1 Answer

Yamaha xs 250 wont start


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 the 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 CDI box.
Spark plug cables in bad condition and shorting check for leakage in the dark, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty MAP, CKP, O2, TPS, sensors.
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box.
17. A stuck bent or burnt valve.
18. Tip over sensor needs a reset.
19. Check for engine trouble codes.
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.
https://yamahaclub.com/forums/topic/39824-xs250-wont-start What to do When Your Motorcycle Won Start
Yamaha XS250 360 400 Twins 1975 1976 1977 1978 Service repai Download...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Oct 14, 2012 | Yamaha Motorcycles

1 Answer

My 1987 yamaha razz riva scooter won't start and it;ll backfire then almost start then nothing?


take out the spark plug and clean it or replace then check the gap

Jun 11, 2012 | Motorcycles

1 Answer

My bike just backfires and wont start


Hi, Hotshot1972 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 blue links below. Good luck and have a wonderful day.
Engine won start backfires out the exhaust
http://www.snowmobileworld.com/forums/59-ski-doo/25785-my-sled-backfires-then-won-t-start.html
Yamaha XJ600S 1992 Service Manual
OEM parts for Yamaha
Yamaha Diversion XJ600N Owner Manual

May 19, 2012 | 1995 Yamaha XJ 600 Diversion S-N

1 Answer

My yamaha genisis fzr 600 wont start now and backfires when i try to start it


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. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
8. 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.
9. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
10.. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
11. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
12. Faulty neutral, clutch lever, or kickstand safety switch.
13. Faulty fuel pump fuse or relay.
14. 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.
My 1993 Yamaha FZR 600 Won Start
FZR Won Start The FZR Forum
https://www.tradebit.com/filedetail.php/2864660-yamaha-fzr-600-service-repair-manual-pdf
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Mar 24, 2012 | 1995 Yamaha FZR 600

1 Answer

Honda cx 500


If it has spark,compression and getting fuel it should hit,backfire or something.pull out a spark plug and see if its wet with fuel or dry,squirt a small amount of fuel into the plug hole ,replace the plug and see if it tries to run,if so then clean the carburetors then give it a try

Apr 05, 2010 | 1978 Honda CX 500 A

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