Question about 1988 Yamaha XV 535 Virago DX

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The engine is firing on one cylinder and when the throttle is openend up it fires both is this a bad cdi box or coil,how can I check them without taking it to the shop

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Clean the carb on the bad cylinder. It may have a plugged pilot jet. The bike has CV carbs. There is a chance that the offending carb may have a pin hole in the diaphragm causing one slide to open later than the other slide. This could also be the problem. With the air cleaner removed, look at both carb slides and see if they crack open at the same instant or if one is definitely later than the other. That will confirm or eliminate the diaphragm.

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Posted on Jun 14, 2009

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1 Answer

No firing no fuel pump coming on why?


Hi, Joe #15 is jumping up and down waving a "PICK ME" flag otherwise 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.

Oct 19, 2016 | Motorcycles

1 Answer

My 1980 pe 250 is getting fire from magnetio to cdi box but not to coil put new cdi box off a running pe 250 and still no fire to coil


Check the coil. Swap it with another if possible to check. Sometimes coils fail short-circuit on the primary. If so, you will see no signal from the CDI when attached to the coil.

Apr 14, 2015 | Motorcycles

1 Answer

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Check your tank vent. Ride the bike until it stalls, pull over and pop open the gas tank lid. If you hear a "ffffwwwwwah" of air being sucked in when you open the tank, your air vent is blocked. The bike runs great when you start out, but as fuel is taken out of the tank no air can get in to replace it and the tank develops a vacuum.

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1 Answer

Miss fire after up to temp and runfor short amount of time. I get a miss fire coming to a stop..drops to cylinders or 1. will not accelerate at all boggs with miss fire.


Joe, i'm afraid we'll need some more info; year, make and model. Have you changed anything to after market like air cleaners or exhaust? How many miles are on it?

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\

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1 Answer

Will 2000 r6 git fire to plugs if pick up coil is bad


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.
http://www.r6messagenet.com/forums/r6-maintenance-technical/26969-bike-turning-over-but-not-starting.html
http://www.r6-forum.com/forums/46-general-discussions/60006-r6-turns-over-but-wont-start.html
1999 2002 Yamaha YZF R6 Service Manual R6 Moto Data Project
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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2 Answers

Do u know the firing order for a 89 suzuki


89 Katana uses two coils, one fires cylinders 1 and 4 together and the other fires 2 and 3 together. It's a waste spark system. So your firing order is either one coil or the other every revolution.

May 02, 2010 | 1989 Suzuki GSX 750 F (Katana)

1 Answer

At idle and half throttle the front two cylinders dont fire


The year of the magna can make a difference on the answer. Early magna's had two cdi boxes. Later models had one.The front two cylinders use the same coil and possibly the same cdi box.I suspect a bad coil since since it operates both cylinders. Compare the readings between the two coils or switch them to see if the problem changes from front to back. This will work for duel cdi box models too. If these checks show no change in the front cylinders not firing, You probably need a new pulse pick up(the cdi equivalent of points.

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