Question about Yamaha YZF-R6 Motorcycles

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I have an 02 R6 that around 5 to 6k it seems to sputter.

Sort of like it is miss fireing but not, also ive changed the fuel pump that seemed to fix it at first then it died while i still had it idling from installing the pump and wouldnt start for a few minand after it cooled down i chocked it and gave it gas and got it to start and it was like miss firing till i reved it a bunch and it cleared out and basicly has ran ok since but seems to sputter, the coils, stator, rectifier, battery, coils, air filter "kN" fuel filter and fuel main line have been changed, now sometimes when i ride it "but only after a few mile ride" it will be miss firing at idle and almost dies but seems to runfine at higher rpms, quick pick up and all. when i get back home on it and its miss firing it seems like if i feel the fuel pump its clicking so much it cant keep up. after it did it the very first time i changed the plugs and four was def gas fouled. and after the first start and everything it ran great till i rode it a few miles again, then i checked the voltage on the battery and found it wasnt charging again and i had a burnt wire that came out the plug, i thought it would live when i changed the startor and everything the first go around, " it was burnt then but not to bad, and i had fixed the others that were" now that its charging again its at aboput 13.6 right after i had fired it up after fixing it. it has a full yoshi exhaust too, do you think a jet kit is needed that bad or a valve adjust or something?

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Hi,you have done quight a few things to the bike wich aliminates a few of the problems,first since replaceing the burnt wire did you check that numer 4 cylinders plug was the write coulor,if its still sooty it could be down to a blocked air jet cousing a rich mixture,this sootyness on spark plug is normerly a sign of to rich mixsture or electical falt.
as for the exourst if the bike was running ok when you first put the exourst on it should be ok,some exoursts do fit strait on and some need up jetting,I would ask where you bought it from.
after saying all of this personaly I dont think it would effect just the 4 cylinder if I was you my first job would be to strip the carbs down and clean them up and go for another test drive,I hope this was some help as a ex-biker I understand how frustrating this is all the best hope you sort it from what you have already done I think you will get to the bottom of this and have it running properly in know time,again all the best.

Posted on Jan 09, 2015


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SOURCE: Replaced stator, brand new battery, died after 10k ride

sounds if regulator is not working or poor connections within charging circuit

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SOURCE: replaced stator and battery, bike still givin trouble

the regulater is located between tha battery and the gas tank .There are (3) white and(2)red wires .See if they are showing signs of damage from heat more than likley they are because when you "boost" or jump these bikes you burn a very weak diode witch regulates the charging time from the stator i would check ebay for the best price on a new regulater rectifier you may need one.I had the same problem with my 2000 model r6.good luck bro!

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SOURCE: motor back fires and dies while going down the

Check your fuel petcock, check the vacuum hose to the petcock. Make sure it is not cracked or not sealing well at each end. Hope this helps.


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SOURCE: 2001 nomad, has power commander, vance and hinse

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SOURCE: Ducati 999 died on a ride - electrical problem I think

i have the same problem but what plugs are u talking about and have u been able to fix it. i know for sure my batt is blown it will not hold charge so my first step is to replace it. but i was wondering what other problemPost Solutions i may encounter

Posted on Feb 16, 2010

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