Question about 1996 Yamaha YZF 600 R thunder cat

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Electrical? Carbs? Battery?

Electrical? The power of the bike near dies when the gas is opened up to high.. the power also fluctuates with the blinker, gets worse when the headlamps are on high. Sounded like the carbs, but now im not so sure.

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  • Yamaha Master
  • 40,013 Answers

Hi, Jeannette in order to check out any main electrical system, you have to start with a fully charged battery 12.5 volts or better, and be able to pass a load test if necessary. "WARNING" never plug or unplug any electrical connector with the engine running !!!
1. Check battery terminals for damage or corrosion, check 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.
2. Check the voltage drop at the battery when you hit the starter button, anything below 9 volts you might have a faulty battery.
3. Check voltage at the battery with the bike running at 3,600 RPM should be 14.3 to 14.7 volts. If you are not getting these numbers, you might have a faulty voltage regulator.
4. Make sure voltage regulator is "GROUNDED" and functioning properly, watch the video below on how to test a voltage regulator.
5. Unplug the connector to the alternator and hook your multimeter leads to the alternator (pin/socket selection does not matter) set the multimeter to AC volts, at an idle the multimeter should read 16 to 20 volts AC. at 2,000 RPM 32 to 40 AC volts, 3,000 RPM 48 to 60 AC volts. If you are not getting these numbers, you may have a faulty rotor, follow step 6
6. Set the multimeter to OHM'S, connect one lead to the alternator (any pin/socket) and the other to a ground, the multimeter should read infinity. Connect both leads to the alternator multimeter should read 0.1 to 0.2 OHM'S. If you are not getting these numbers, you have a bad stator.
7. Check all wiring in the charging circuit for worn or chaffed spots and all wiring connectors in the circuit for corroded, broken, or loose pins/sockets, which is the # 1 offender.
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.
YZF600R Forums View topic Charging system
HOW TO CHECK YOUR CHARGING SYSTEM and CHANGING the STATOR and REGULATOR...
Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
OEM parts for Yamaha
Yamaha YZF600RP Owner Manual

Posted on Aug 17, 2016

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Carb problem

i have an extra set of carbs, you can e-me @ lddfc555@aol.com

Posted on Mar 13, 2009

jimmy nutron
  • 132 Answers

SOURCE: carbs have been cleaned and balanced. The bike is

if the carbs are properly balanced the only thing it can be is the timeing. it could be a littler advanced or turned back check that

Posted on Jun 04, 2009

  • 3567 Answers

SOURCE: Won't idle without choke

The pilot jet controls the air/gas fuel mix at idle . If the jet gets plugged up not enough gas gets to the emgine at idle. You will need to remove the carbs and float bowls and clean them, paying special attention to the pilot valve. Count the number of turns to remove the pilot screw and replace the same number of turns then turn counter clockwise 1/2 turn.

A “very helpful” rating for this answer? Thanks!

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Posted on Jun 30, 2009

  • 11 Answers

SOURCE: Back firing at idle

A backfire comes from unburned fuel getting into the exhaust manifold and igniting.The cause is normally poor ignition. So it can be either your spark plug gap is too big, dirty, faulty, etc or your coils are problematic, but as 1 coil is allocated to 2 pots I would doubt this. The other is that the fuel mix of the cylinder is way too high and it can not burn all the fuel. balancing the carbs will help fix the problem. Your idle RPM should be around 12-1400.

To balance your carbs you need 4 vacuum guages. You will plug these into the carbs (1 per carb) by removing the screw in the manifold just above where each carb attaches to the engine. Set your idle screw to get the engine running at about 2-2500 rpm and adjust the butterfly position till you get all the vacuum gauges at the same reading (IE max that you can get for the pot).

Hope this helps

Posted on Sep 17, 2009

wayneman01
  • 301 Answers

SOURCE: just had my carbs refurbished bike starts on choke

It sounds like it is running too lean for some reason. First, let's assume that the normal tune up items are correct (valve tappet clearances, spark plugs are good, air filter, etc.). Also included in this assumption is that the engine has good compression (at least 140 psi on all cylinders) and that there are no air leaks between the carbs and the engine.
The aftermarket exhaust will generally require larger jetting in the carburetors - especially when combined with anything but the stock air cleaner box assembly. So, right off the bat, plan on going up to the next size larger pilot and main jets for the exhaust alone - PLUS another two to three sizes bigger if you aren't using the stock air cleaner box.
Finally, make sure the carbs that you have refitted to your bike are not clogged up from sitting with gasoline in them. It only takes a few months for the fuel to evaporate and leave behind a varnish that will require the carbs to be disassembled and cleaned.

Posted on Dec 07, 2009

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I have a fj 1200 1990 it idles high once it has warmed up and then dies down on and of the carburettors have been cleaned and the throttle cables work correctly any ideas on what could cause this


It could be caused by carbon build up on the valves or worn valves or worn timing chain as the bike is 25 years old, and is the bikes exhaust standard if not the carbs jets will need to be changed to suit

Dec 20, 2014 | 1986 Power Source-1990 Yamaha FJ1200...

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Will only idel with choke all the way open


Check the quality of the fuel. If the fuel quality is good you may need to clean the carbs.

Aug 23, 2014 | 2007 Yamaha Royal Star Venture

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So i just tried to start my bike yesterday after its been sitting for awhile and it just barely started and then died, but after that i tried starting it again and i have no power to anything on my bike...


motorcycle batteries do not last very long -- and they store even worse. I would try and jump start the bike with the battery installed and see if you can get it to turn over. if it will not start ( crank ),, check the main fuse and make sure it did not blow. as for the ' barely started and died ' -- I would check to make sure that there is no water from condensation in the gas tank which is now in your carbs, drain the carbs and add some gas additive ( water eater ) to the tank and see if that helps.
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Dec 31, 2010 | 1997 Suzuki GSX-R 600

1 Answer

Bike dies if rpm rise above 4 or 5


Hi!

That clicking noise comes from the start-relay, that tells your battery is out of power or almost out of power, when the battery isent giving enough of power the start-relay clicks. Recharge the battery,
Now for that other thing, that your bike dies around 4-5 rpm, that can be caused by many things but i think that you will find the solution in the carbs. You told us that the bike has been standing outside for 3 years, that tells me that you carbs is in need of cleaning. Inside the carbs is a lot of smal parts that opens and closes when you hit the gas, after so long time outside some part dosent work as they should, therefore when you hit the 4-5rpm the bike dosent get the right mix of fuel and air since the carbs harsh and the bike dies.
Take the bike to a repaire shop and let them clean and calibrate the carbs and your problem will be solved.

Good luck
Nic

Apr 15, 2009 | 2001 kawasaki ZX-9 R Ninja

1 Answer

Bike won't idle and dies when r.p.m.'s drop below 3,000.


did you try to adjust the idle screw? its one screw in the middle of the four carbs, if that dosen't work your carbs probly need a rebuild

Feb 15, 2009 | 1985 Honda GL 1200 Interstate Gold Wing

1 Answer

Bike turn off while driving


I was on my way home from work when I stopped at the stop light and when I went to take off my bike just died. It started right back up but as I gave it gas it would die again. I managed to roll it out of traffic into a parking space. I tried the choke the fuel valve, but nothing worked. It would idle, but as soon as I would give it some gas it would just sputter and die. I got a ride to my house where I got my truck and came back to my bike. I started it up and soon as I gave it some gas, it died. I started it up again and gave it some gas and then it started working just fine. I revved it a few times, but it wouldn't die again. I drove it home and didn't have a problem. It seems to be running fine now. What the heck?? It only has 693 miles on it. It has almost a full tank of gas. What could possibly be wrong?,It's fuel or air related. If your bike didn't have any issues at all, no minor symptoms until it fell on its face like that, I'd wager something worked its way loose. Could be something is preventing fuel from reaching the carbs or something rattled loose in your airbox or carb boots. If something blocked off your air filter it would show those symptoms, or if you suddenly had a huge vacuum leak from a carb boot coming undone. I'd start by verifying you have fuel in the carbs by attaching a length of tubing and opening the drain screw at the bottom. Fuel comes out of your carbs, look elsewhere. No fuel, find out why it's not getting to your carbs. Perhaps your fuel line kinked.,,,

Nov 10, 2008 | 1984 Laverda Alpino 500

1 Answer

My bike die


my bike just died. It started right back up but as I gave it gas it would die again. I managed to roll it out of traffic into a parking space. I tried the choke the fuel valve but nothing worked. It would idle, but as soon as I would give it some gas it would just sputter and die. I got a ride to my house where I got my truck and came back to my bike. I started it up and soon as I gave it some gas, it died. I started it up again and gave it some gas and then it started working just fine. I revved it a few times, but it wouldn't die again. I drove it home and didn't have a problem. It seems to be running fine now. What the heck?? It only has 693 miles on it. It has almost a full tank of gas. What could possibly be wrong?,it's fuel or air related. If your bike didn't have any issues at all, no minor symptoms until it fell on its face like that, I'd wager something worked its way loose. Could be something is preventing fuel from reaching the carbs or something rattled loose in your airbox or carb boots. If something blocked off your air filter it would show those symptoms, or if you suddenly had a huge vacuum leak from a carb boot coming undone. I'd start by verifying you have fuel in the carbs by attaching a length of tubing and opening the drain screw at the bottom. Fuel comes out of your carbs, look elsewhere. No fuel, find out why it's not getting to your carbs. Perhaps your fuel line kinked.,,,

Nov 10, 2008 | 2007 Highland Highland Outback

1 Answer

Bike died


I was on my way home from work when I stopped at the stop light and when I went to take off my bike just died. It started right back up but as I gave it gas it would die again. I managed to roll it out of traffic into a parking space. I tried the choke the fuel valve, but nothing worked. It would idle, but as soon as I would give it some gas it would just sputter and die. I got a ride to my house where I got my truck and came back to my bike. I started it up and soon as I gave it some gas, it died. I started it up again and gave it some gas and then it started working just fine. I revved it a few times, but it wouldn't die again. I drove it home and didn't have a problem. It seems to be running fine now. What the heck?? It only has 693 miles on it. It has almost a full tank of gas. What could possibly be wrong?,It's fuel or air related. If your bike didn't have any issues at all, no minor symptoms until it fell on its face like that, I'd wager something worked its way loose. Could be something is preventing fuel from reaching the carbs or something rattled loose in your airbox or carb boots. If something blocked off your air filter it would show those symptoms, or if you suddenly had a huge vacuum leak from a carb boot coming undone. I'd start by verifying you have fuel in the carbs by attaching a length of tubing and opening the drain screw at the bottom. Fuel comes out of your carbs, look elsewhere. No fuel, find out why it's not getting to your carbs. Perhaps your fuel line kinked.,,,

Nov 10, 2008 | 2003 ATK 260

3 Answers

Map sensor


Hi,

Have not worked on an HD but my thoughts and additional guesses would be:
1. fuel contamination (water at bottom of tank);
2. primary pump (in my case it was inside the fuel tank & might not be present in your bike);
3. fuel lines & clamps to & from primary pump or to the carbs;
4. in line filters;
5. vacuum controlled fuel valve (oppose to the usual manual petcock)
6. if it were the MAP sensor, bike wouldn't even run a block away + idling would be rough;
7. by chance are you using a Power Commander?

Also your post "bike will start and run fine for a few blocks then die" indicates that indeed fuel got into the carbs before but not when running meaning the bike used what was inside the bowl and was not replenished.  Alternately, the fuel flow to the carbs might not be sufficient and there is a leak or a blockage somewhere.

As said might not work for your bike but has come across some of the above on numerous occasions.

Good luck and Kind regards.

Ride Safe.

Oct 23, 2007 | Harley Davidson Harley-Davidson Motorcycle...

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