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Keihin cvkd36 carburetor problem

I have a in-line 4 cylinder 1999 Yamaha YZF600r Thundercat. The outer cylinders are running too lean and the inner two cylinders are running very rich. Tried raising and lowering the floats, switching around the ignition coils, cleaned out the carbs, and sycronised them, adjusted the timing, but the same problem reoccurs. Any ideas please? appreciate it.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1982 XJ 650 maxim cylinder 2 & 4 won't run

Are you saying that 2 & 4 got gas with external tank but not with gas tank? If so something else has happened ,if gas is getting to the carb it cannot by-pass 2 to get to 1. Take the tank back off ,connect to external, again. See what happens.

Posted on Sep 11, 2009

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SOURCE: My 1985 Yamaha V Max in not firing on the front

check all earthing connections on the ignition system and in fact on the whole cycle. A loose or dirty connection may be the cause.

Posted on Sep 17, 2009

ollie reece
  • 1167 Answers

SOURCE: Carb is running rich. How can I adjust it?

on the mixture screw in picture below buddy b4b6b13.jpg

Posted on Nov 03, 2009

czaa
  • 4533 Answers

SOURCE: carburetor identification!

try a motorcycle salvage yard-they know bikes or see your local dealer and talk to a tech kawa motor corp has an 800

Posted on Dec 26, 2009

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SOURCE: My 1974 yamaha dt175 seems

The 175 is a two stroke and if gas were getting past the piston it would collect in the crank chamber which is sealed from the gearbox and gear oil. If the gearbox oil is a white-ish color the problem is water emulsifed in the oil.

As far a the cutting out, many things could cause it. The points need filed and set or replaced, the carb and filter need cleaning, bad crank bearings (usually the crank seals are bad also), condensor or coil is going bad. I have listed the items in probable secquence Hold the flywheel firmly in both hands and then lift up and down, left and right. If it is not ROCK SOLID the crank bearings need replaced. Any other questions just post a reply. By the way, you can still get many of the parts to your bike at Babbitt's. Go to the website below to see an exploded diagram of the engine and other parts of the bike. Let me know what you find out.
www.babbittsonline.com/pages/parts/viewbybrand/default.aspx

Posted on Aug 15, 2010

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Will a 2000 yzf600r thundercat motor fit on a 1996 yzf600r thundercat


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Hi, Anonymous and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
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Hi, Sandmanaz and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
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9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
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.
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Hi, Smcclatchey2 always check fuel flow first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
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3. Fuel filter clogged with rust or dirt.
4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing*
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn*
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8. Fuel pump not working*
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10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
* If equipped or applicable.
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1999 YZF 600 carb breakdown. Gas will not go to carb rail. why?


Hi, Smcclatchey2 always check fuel flow first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel cap or fuel tank not venting properly.
3. Fuel filter clogged with rust or dirt.
4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing*
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn*
7. Fuel line from the fuel valve to the carburetor or fuel pump clogged, cracked, pinched, bent, broken, or missing.
8. Fuel pump not working*
9. Fuel line touching cylinder or head causing fuel to boil and vapor lock, repair by rerouting and wrapping line with convoluted tubing.
10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
* If equipped or applicable.
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.
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My yamaha yzf 600 1997 thundercat just died. Doesn't want to start no lights on dash come on. When I connect jumper cables from car to bike all lights come on and bike starts but dies as soon as jumper...


Hi, Petrusm_jc7 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. Failed alternator/generator and or voltage regulator.
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4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
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8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
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13. Fuel tank empty.
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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.
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5. Spark plug gap too close or too wide.
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8. Faulty CKP or CMP, MAP, ETS, ATS, TPS, O2 sensor.
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14. Damaged carburetor.
15. Incorrect valve timing.
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18. Check for engine trouble codes
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