Question about Yamaha Wave Runner GP 800

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I have a 2001 Yamaha gp800r It sat for a year before I decided to rebuild the engine.now I have 140psi in each cylinder but I have weak spark. it has a new battery and plugs.i didn't have this issue

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Well you have a few options here to try and fix this issue.

First I would check the kill switch boot and make sure that its still intact. If not then the kill switch is the problem.

Second thing is checking all the fuses

Third if all checks out ok, your going to want to run a few tests on your CDI. Once you open the front cover, there are two wires a black and a white. your going to want to disconnect those and then check spark or start. If spark/runs then its your kill switch if that does not work your going to want to get a manual and a OHM/multi meter and test your CDI

Posted on Apr 24, 2017

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Posted on Jan 02, 2017

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1 Answer

How do you check the electrical system for no spark or weak spark on polaris sportsman 500 HO


hi seth if you remove the spark plug from the cylinder head and rest it against the side of it against the cylinder head you should be able to see if it is firing while you crank the motor. otherwise a spark plug tester can be installed in place of the spark plug

Feb 04, 2016 | ATVs

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How to fix my honda civic it has low compression and week fire how u fix it


low compression can be either leaking head gasket-bad head /burnt valves--piston rings --damaged cylinder wall all of these are a tear apart fix a rebuild depending on mileage and condition of engine a replacement engine might be a better financial solution ---as for weak spark coil --wires-spark plug -fouled spark plug --and if same cylinder as damaged one the compression

Sep 30, 2015 | Honda Cars & Trucks

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Engine keeps backfiring under load motor is an enduro xl 13.5 hp


Need Make/Model/Year/Engine Model/Deck Size, and hours on meter if you have one. A short description of the events preceding the beginning of the problem is also helpful.

Several possibilities:
1. Needs a valve adjustment or a valve job. Start with adjustment.
2. Needs new plugs. Start with new plugs.
3. Shear pin under flywheel is slightly damaged throwing off the timing. Remove flywheel examine shear pin for any damage. Just go ahead and replace it; if it even looks nicked or sliced.
4. Coil, or spark plug wire, is going bad. Very hard to test a coil for weakness without test equipment that the average person doesn't have. Check the first 3 problems, first. If it still backfires, then replace coil.
5. The other thing that causes backfire is fuel mixture too lean. On a small engine this is not usually an adjustment problem. It may be the fuel system/carburetor is dirty or partially clogged. It may also be an air leak in the gaskets of the intake manifold. If nothing else solves the backfire, remove the carburetor and clean or rebuild it. This is the least likely of the options so save it for last.

If compression is good and cylinder leakage is minimal, but a cylinder is misfiring or shows up weak in a power balance test, it indicates a fuel delivery or ignition problem (fouled spark plug or bad plug wire). A power balance, or cylinder balance, test should be run on a twin cylinder engine.

If an engine is hard starting, runs rough, misses or lacks power, run a cylinder balance test to determine if both cylinders are operating to their full potential. You will need an engine tachometer, a spark tester, and an insulated screwdriver.

1. Using the spark tester, with the plugs in, start engine and verify spark is equally good on both cylinders. Remove spark tester.
2. Connect engine tachometer.
3. Run engine at top no load speed. Note rpm.
4. Ground one cylinder spark plug with screwdriver. Note rpm.
5. Ground other cylinder with screwdriver. Note rpm.

The difference in RPM between the cylinders should be less than 75 rpm. If the difference between the two cylinders is greater than 75 rpm, the cylinder with the least rpm loss is the weakest and is a potential problem.

Note: If the spark plugs are new this could be an indication of a weak coil. Of course it could also be compression (rings), or valves.

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1 Answer

I have a yfm25bw big bear 250 Yamaha it wont start, has a very weak spark, back fires sometimes. I have changed the coil , but still the same ,good it be the cdi unit ?


Most newer engines use an electronic ignition system, if the spark is weak verified at night (in the dark) by removing the spark boot and watching the arc jump onto the engine block, then this could be your problem. Otherwise, you have a carburetor issue which is very common in ATVs. Rebuild it using a complete kit to include a float and throttle spring... replace dog eared screws, if there are any. Ensure you put the keeper clip on the correct groove on the needle valve and be careful when bending the float arm as they break off easily... making them useless.

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1 Answer

I have a 1986 Yamaha yz490. it ran great until it sat for two years when i went to start it it felt like it wanted to start. I replaced the spark plug and replaced the fuel filter. when i kicked it over i...


Your cylinder is probably full of fuel, becareful here. Disable the spark and kick it over with the spark plug out to remove the fuel.
Your problem sounds like a stuck float in the carburator. It needs to be removed and cleaned out good.

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1 Answer

My 2001 Yamaha YZF-R6 misfires on cylinder #1 when it is cold. Spark plug and coil have been swapped with cylinder #4, still misfire on cylinder #1 only when it's cold.


Hi, Juv69576 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. Spark plugs in bad condition or partially fouled.
4. Spark plug cables in bad condition and leaking check for spark leakage in the dark
5. Spark plug gap too close or too wide.
6. Faulty ignition coil, module, and or sensor.
7. Loose, dirty, or corroded ignition module connector at crankcase.
8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
9. Intake air leak.
10. Water, dirt, or rust in the fuel system, carburetor and/or filter.
11. Old dead or bad fuel.
12. Fuel tank vent system plugged or carburetor vent line closed off.
13. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
14. Carburetor controls misadjusted.
15. Damaged carburetor.
16. Incorrect valve timing.
17. Weak or broken valve springs.
18. Damaged intake or exhaust valve.
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 nice a day.
2005 R6 power loss misfiring
R6 motorcycle cylinder misfire power loss fault finding spark check...
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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1 Answer

Firing on one cyl. weak spark


does each plug have its own seperate coil? if so, i would say the coil for the weak cylinder is faulty

May 23, 2010 | 2001 Yamaha V Star 1100 Classic

2 Answers

2001 5 series spark plugs are getting flooded with oil making my engine misfire why and what can i do too fix it


Well, the key question is how much oil are you consuming...Quart in 600 miles or more is considered normal, but I prefer 1 quart in 2500 miles...

If high oil consumption, consider hotter plugs, and decide if engine work makes sense. If only a cylinder or two, try hotter plugs in those cylinders

If no oil consumption, look to weak spark, damaged wires, etc.

May 23, 2010 | 2004 BMW 5 Series

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I have a 1984 Yamaha SRV, it hasn't been run in


There is no battery on the SRV's. Don't look there. I have an SRV that sat for several years. Disassemble the carburetor, clean out the jets with carb cleaner and a toothpick or small copper wire, When you think you are done, start again and clean it like you were just starting. These are great motors but the carbs have to be kept clean. At the end of the season, empty the carb by removing the plug on the bottom and draining it.

Jan 16, 2010 | 2008 Yamaha XT 660 Z Tenere

1 Answer

Engine light has come on and car is misfiring, loss of power, sounds rough


Main causes of misfire would be loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression.

Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

"Lean misfire" can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator.

Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

You can isolate the weak cylinder by temporarily disconnecting each of the spark plug wires, one at a time, while the engine is idling. When there's no change in the idle speed, then you have pinpointed the weak cylinder.

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