Question about 1999 Yamaha YZF 600 R thunder cat

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What is the measuring gap for all four spark plugs

I have a 1999 yamaha thundercat and i need to replace th espark plugs. before i replace them, what is the measuring gap for all four plugs. Thanks paul

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  • Yamaha Master
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0.7mm to 0.8 mm

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SOURCE: Fork seal replacement

Did you try taking down the fork seal and cleaning out with wd/40 and a piece of 30mm film? You should always try this first. The seals rarely go bad. There's probably just a vary small rock holdeing it open and the film will dislodge it the wd is just to help things along.

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SOURCE: what are the spark plug gap settings for a 2000

cd904c8.gif Please rate this answer. Thanks!

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SOURCE: What is the spark plug gap for a 1980 yamaha Maxim

.023 to .032 in
0.7~0.8 mm
ngk bp7es plugs

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.030

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SOURCE: how do you replace the spark plugs on a 2004 Yamaha Siverado 1100

Lift the back of the tank up and prop it up. Remove the chrome beauty covers, find spark plug wires and remove. Blow out with air first. Chaz Moto DC

Posted on Jan 22, 2010

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1 Answer

Backfires when you try to rev up engine,


check fuel flow and check spark at spark plugs

According to an "ATV Rider" 2009 article, "When the Grizzly was introduced in 1998 as a 600cc machine, the top was blown right off the displacement wars of the time."
It was replaced in 2002 with Yamaha Grizzly 660, an even bigger engine derived from the well-established all-terrain vehicle (ATV) Yamaha Raptor 660R.
Grizzly's 660 cubic centimeter (cc), four-stroke, liquid-cooled single overhead camshaft, five-valve engine performs well in open country, but sometimes it causes serious problems for owners.
Before you call a Grizzly dealer, however, trying a few tricks in your garage can save you a lot of time and money.

Check the fuel level.
Locate the fuel meter indicator on top of the multifunction display.
If it does not work properly, open the fuel tank, and push the Yamaha 660 Grizzly side to side.
Ensure the fuel is not contaminated by water or rust.
If you have not driven your Grizzly 660 for a long time, drain the tank completely, and fill it with a fuel tank cleaner.

Check fuel hoses for cracks or leakage.
The hoses should be soft and simple to bend.
Replace those that show any sign of wear.

Check the compression.
Screw a compression tester into the spark plug hole, and press the electric starter button.
If no compression exists, contact a Yamaha dealer.
Wipe wet or dirty electrodes with a dry cloth.
The spark plug gap should be checked regularly

Correct the spark plug gap.
Measure the gap with a wire thickness gauge.
If necessary, adjust it to 0.8mm using a screwdriver or replace the spark plug.
Use only a Yamaha-specified spark plug.

Check the Yamaha 660 Grizzly's battery.
Operate its electric starter.
If the Grizzly starts quickly, then its battery is in good condition.
If the engine turns slowly, check the battery lead connections, and you may need to change the battery.
If the engine still does not eventually start, your Grizzly is beyond home repair.


Jul 23, 2013 | Yamaha 2005 Grizzly 660 Auto 4x4

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Hi guys, my bike keeps cutting out if i put lights on or press the brakes front or rear. bike starts and idles fine. totally stumped and any help would be great


  1. Yamaha Fazer Engine and Transmission
    • The 1998 Fazer is powered by a four-stroke, 16-valve, in-line, four-cylinder engine with displacement measuring 36.55-cubic inches. This motor generates 95 horsepower at 11,500 rpm and 45.0 foot-pounds of torque at 9,500 rpm. It has a six-speed transmission and a liquid cooling system. The 1998 Fazer has a top speed of 139.8 mph.
    Yamaha Fazer Brakes, Weight and Fuel Capacity
    • The 1998 Fazer has dual-disc front brakes and single-disc rear brakes. It has a seat height of 31.1 inches at its lowest setting and a dry weight totaling 416.7 lbs. The Fazer has and electric starter and a fuel capacity of 4.75 gallons.
    Yamaha Thundercat Engine and Transmission
    • The 1998 Thundercat is powered by a four-stroke, 16-valve, in-line, four-cylinder engine with a displacement of 36.55-cubic inches. It generates 100.00 horsepower at 11,500 rpm and 48.7 foot-pounds of torque at 9,500 rpm. The Thundercat has a six-speed transmission and a liquid cooling system.
    Yamaha Thundercat Brakes, Weight and Capacity
    • The Thundercat has dual-disc front brakes and single-disc rear brakes. It has a dry weight of 412.3 lbs. and a seat height of 31.3 inches at its lowest setting. The 1998 Thundercat has an electric starter, a 5.0-gallon fuel capacity and a top speed of 158.4 mph.

Jan 14, 2013 | 2003 Yamaha FZS 600 Fazer

1 Answer

Spark plug gap 1999 yamaha 650 vstar classic


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. 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.
Misc Info
What should you set your spark plug gap at for star 650
http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha
http://www.starmotorcycles.com/assets/service/manuals/2003/LIT-11626-16-05_22.pdf

Apr 21, 2012 | 1999 Yamaha V Star Classic

1 Answer

98 Thundercat running rough, had carb problems before, didnt have to do anything, the problem dissappeared on its own. Any suggestions pls


Hi, R_joarder 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.
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. Fuel tank vent system plugged or carburetor vent line closed off.
12. Vacuum line from intake manifold to fuel valve is broken, cracked, pinched, or missing.
13. Carburetor controls misadjusted.
14. Damaged carburetor.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
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 nice a day.
YZF600R Forums View topic running very rough at take off
Rough Running Thundercat
Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
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Aug 16, 2011 | 1998 Yamaha YZF 600 R thunder cat

1 Answer

Best Spark plugs for a 1993 GMC Jimmy SLE Vortec V6 - Fuel Economy help!


AC 41803 Drivetrain:Four Wheel Drive;
@Gap .045" This is a Platinum High Performance Spark PLug


Option : ASP AR25
EngineVIN:W;
@Gap .045"@ High Performance

Stay away from those Gimmick Spark Plugs , they are just more money for nothing. A good platinum spark plug is all you need, the key is to gap it correctly to your application...

On GM products Vin # W it is .045 plug gap
On Gm products Vin # Z it is .035 plug gap

You will not have huge gains in fuel mileage from replacing spark plugs except to say that if your old ones are just extremely bad, there is no magical spark plug with extra mileage manufactured into it.... Hope this helps...

Aug 24, 2009 | 1999 GMC Jimmy

1 Answer

What is the gap of spark plug


Spark Plug:
CR9E (NGK)
or
U27ESR-N (Denso)
Gap 0.7 - 0.8mm (0.028 - 0.031 inches)
Spark Plug torque: 12.5 Nm.kg (9.0 ft.lb)

From the owners Manual at

http://www.yamaha-motor.com/sport/service/viewmanuals/viewmanuals.aspx?ls=sport

Jul 17, 2009 | 1999 Yamaha YZF 600 R thunder cat

2 Answers

Power Loss at around 3000 rpm


are the carbs balanced correctly and are you sure that all of the jets are clean. if not try it, it might work. sluggish throttle response is normally to do with the carbs.

Dec 30, 2008 | 1999 Yamaha YZF 600 R thunder cat

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