Question about Yamaha YZF 600 R thunder cat Motorcycles

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1996 yzf 600r turns over will not start

I have a 1996 YZF 600r took it apart to restore , it ran well after putting it back together it turns over nicely but won't start got a spark, the airbox is off and it just turns over, the fuel pump is getting gas but it won't even backfire.

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  • Yamaha Master
  • 40,013 Answers

Hi, Michael 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 module.
Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box if applicable.
17. Tilt sensor needs a reset.
18. Security system not disarming alarm 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.
06 Yamaha YZF600R Turns Over but won start Fixxit
http://www.sportbikes.ws/showthread.php?t=89254
Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
OEM parts for Yamaha
Yamaha YZF600RP Owner Manual

Posted on Aug 13, 2016

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SOURCE: 04 yfz 450 wont start with electrical start

i have a 04 yfz 450 quad. the compression ratio like yours is extremely high. ive had my battery go bad and found that another battery other than factory would turn over the engine, but would not start. i paid the 100 dollars for the factory battery and it fired right up. because of the high compression you need a high cranking battery.

Posted on May 07, 2009

ollie reece
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SOURCE: 06 yamaha rhino 450. ran fine when parked 6 mos

foat problems buddy adjust float in the manual it is set to high so it is shutting fuel off take carb off take bowl off and adjust the metalk the little valve is hanging on

Posted on Aug 09, 2009

ollie reece
  • 1167 Answers

SOURCE: my gpx250 wont start unless i put fuel in airbox

hi buddy take the carb off and take the bottom of the carb off by undoing the 2-4 screws an just pop the bottom off and inside will be the float this needs adjust you need to slide the pivot pin out and the float will just come off with the inlet valve still connected take this inlet valve off just slides off and bend the tab down wards so it allows more fuel in the carbs f2b20fc.jpg
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Posted on Sep 14, 2009

  • 314 Answers

SOURCE: I have a gsxr 750 1990 the L modelk its in good

Don't use cold start.it will not solve your problem.Try running it with out the air cleaners ,it may be that you have an air intake problem and not getting the right Air / fuel mixture .

Posted on Mar 13, 2010

Testimonial: "cheers man ill give that a try"

voices122
  • 12 Answers

SOURCE: my honda cbr 600 wont start and keeps backfireing

Check your plugs. If all four are sparking then your carbs are out of sync. They will need to be re-balanced.

If you are capabable in doing this job your self, you will need a screwdriver that fits your adjuster screws and a CarbTune Carb balancer.
Remove your tank and airbox.
You should see the flaps inside your carbs. These should open when you move your throttle.
Start on the outside carbs to get them balanced with the 2 centre ones.
To start, unscrew the adjusters all the way out. then screw them in until the 2 outer carbs move at the same time as the inner 2 carbs
Once this is done then adjust the centre balancer to syncronise the 2 left hand carbs to the 2 right hand carbs.
Now if you have done this correctly, all four carbs should open at the exact same time.
If you have a Carbtune balancer, remove the plugs from the top of your inlet manifold and plug in the hoses from the carbtune balancer.
Start the engine and adjust the screws until the weights inside the Carbtune balancer all read the same.
Once done, remove the balancer, replace the plugs into the inlet manifold, refit the airbox and tank and it should run so much better.

If your not 100% confident to unertake this job yourself, take the bike to your local dealer and ask to have the carbs balanced.

Posted on Mar 15, 2010

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1 Answer

My '97 yzf 600r will start but won't keep going


Hi, Rhiannon_mat 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.
8. Fuel flow to carburetor restricted.
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.
03 Yamaha YZF 600R wont stay running
http://www.vfrdiscussion.com/index.php?/topic/41953-help-stranded-starts-but-wont-stay-running
Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
OEM parts for Yamaha
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1 Answer

My yamaha yzf 600r thundercat dose not turn over all that happens is when I push the starter button the starter relay makes a buzing sound but it has been checked and is in working order the battery is ok...


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Feb 24, 2011 | 1996 Yamaha YZF 600 R thunder cat

1 Answer

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Hi and welcome to the site,

Initially, check, clean, bypass or replace the sidestand switch.

Good luck and thank you for asking.

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