Question about 2001 Yamaha YZF-R6

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Bike problems hi got a 2001/2002 r6 and having problems with it it seems to be running on three cylinders intermitanly no1 i think been looked at by a couple of bike mechnics had carbs stripped and balanced and coils checked 4 resistance and ok. I put standad exhaust back on it because someone said it might be that but the same. help

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  • jamesclaire May 15, 2009

    i will get that checked one mechanic did say that there was moisture poss getting into carbs would this do that?.

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An easy way to tell which cylinder has the miss fire is ti let it idle and get to operating temp. Then spray each header with a little WD-40 which should almost instantly cook off unless the cyclinder is missfiring in which case it will simply drip down the header. I would start by replacing the spark plug cap. Its a simple and inexpensive start which is quite often the case off missfires. For some reason the Old FZR's had a wicked problem with their caps hsorting the spark to the head instead of sending the spark to the plug. Dunno why but they did. Have you actually changed the plugs themselves? Also check compression on all cyclenders. A compression guage is fairly inexpensive and every mechanic or even a motorcycle enthusiast should own one. If the compression is ok, Coils are OK, and the Carbs were TRUELY disassembled fully and cleaned properly as well as synched then I would say that it must be a plug or plug cap. There simply isnt any other place to look.

Posted on May 25, 2009

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  • Yamaha Master
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Not bad if you check the compression on all the cylinders , it may be tht the valve don't seal up on the cylinder which doesn't fire.
The test will sure let you know, maybe too the valve on tht cylinder is burnt.

Good luck.

Posted on May 15, 2009

  • Murtaza Akberali  Versi
    Murtaza Akberali Versi May 16, 2009

    Yes it would do that too for back fire, but as you said that the one cylinder doesn't fire tht's where you have to get it checked even if theres moist poss atleast it should fire., probabley it should fire with missing and uneven running.Well that too doesn't happen.

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