Question about 2001 Yamaha YZF-R6

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I have a 2001 R6. I am having a problem with having full power from the engine. when cold, I pull the choke and have to pull some throttle to get it stared to start and warm up. when warmed up I can take off from stand still but as soon as it hits about 6,000 to about 8,000rpm's it wants to bog down, I have to shift early so I don't hit to bogging, with sitting within that range of RPM's i can get good power with a turn the throttle very slow but when I wanna rip it it bogs down. I can get over 8,000 and its a little better. I have lost power and lights a few times slightly way before any problems occurred with the bogging of the engine. I have checked the spark plugs and all fall within spec, checked the resistance on the coils and all 4 in the bike fall within spec, have had the carbs cleaned and jetted, ignition fusses are good. Im really trying to figure out what is wrong with my bike!!!

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  • ajharris86 Apr 07, 2011

    Thank you for the quick response! I have looked over the coils and spark plugs many times before posting on here. The coils (are within resistance spec) and spark plugs (also within spec) are all firing when the bike is sitting and/or warming up. You stated about checking the fuel pressure and the fuel pump, how would I go about checking those? With only having the bogging from around 6,000 to about 8,000rpm's when hammering on the throttle could that drop the possibilities to being the carbs not pushing enough fuel, bad fuel pressure, not enough fuel being pushed through the fuel pump, or any other reason? I'm just trying to figure out and minus out what I can once I find what is good to mark it out of the equation.



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You did not mention if you have replaced the exhaust headers. The problem you are describing sounds like a carb problem. You mention you have had them cleaned and re-jetted. No jetting necessary if you have not installed headers, or have removed the air intake box. Try this, clean the spark pulg tips, so they look bright shinny. Ride the bike a round for a bit keeping the RPM's up close to your bog. Pull the plugs and look for white or dark deposits. If your plugs are white, or tan, your are running lean (too much air too quickly thru the combustion chambers), and the carbs need re-jetting or your air filters need oiling. If your plugs are dark, (black sooty) she is running rich and you need to re-jet with smaller jets, or free up the intake.

Posted on Apr 07, 2011

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There are few possibilities causing this has to be can be a bad gas problem or cracked or not properly fitted air filter issue.also it can be spark issue. Either a bad plug or bad coil pack. i agree the spark plugs and coil packs are checked.but still in this cases the coil packs and spark plugs if they are very old or worn out can cause this problem.

You can change the plugs. . Then see if you still have your problem. If you do, disconnect the coil packs one at a time and run the bike. If the problem is worse with a coil pack disconnected you know you made a change for the worse. If you unhook one and the problem manifests the same way then that coil is bad.
-------------------- You can't run a clean High air flow filter with stock jetting. So make sure you have the proper filter and/or the proper jetting and make sure that the air box is right in place and doesn't have any gap under which could let too much air coming in the engine. --------------- There's an easier way to test for spark/coil pack. A very simple test for you to do without even tearing into the bike is to make sure the engine is cold. I would even let it sit overnight, then start it up and let it run for about 30-60 seconds (enough to let the headers get warm). Then with your hand, test each header,the one that isn't hot/warm is the cylinder that's not getting spark.Once you've determined what chamber isn't getting spark, it's just a matter of trial and error to see if it's the spark plug or the coil pack. You can swap either the coil pack or a spark plug to another cylinder, re-assemble everything and then try the test over again. ---------- Also check the fuel pressure and fuel pump.get the TPS sensor checked.This checking will point out towards the faulty part causing the problem.thanks.Helpmech.

Posted on Apr 06, 2011

  • raj somaiya Apr 07, 2011

    Either something's still clogged, fuel flow is restricted, or there's a glitch in the vacuum system-either a leak in the lines or a screwed-up, pinched or holed diaphragm in one or more of the carbs.-------
    Yes very much possible that carbs not pushing enough fuel, bad fuel pressure, not enough fuel being pushed through the fuel pump.But also get the TPS sensor checked.Also check all the injectors.If any of the injector is leaking, then it will be low pressure issue at that injector.-------- Check out.this should help.Keep updated.Thanks.Helpmech.



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