Breaking-up/sputtering under load

Ernest Montague afm199 at
Thu Sep 4 10:03:48 PDT 2008

On the track they should be white almost white.  On the street a bit 
more gray/tan.  If there are little shiny speckles on the plug start 
worrying. The plug charts that are on the internet are for old cars, 
all modern cars/bikes run ultra lean.
On Sep 4, 2008, at 9:55 AM, Wayne Beaver wrote:

> Sorry to keep nagging with this one, but after most recent test ride, 
> the
> electrodes on both (brand new...) plugs are quite white...does this 
> indicate a
> lean condition?
> Thanks,
> Wayne Beaver
> NESBA #737
>> Date: Thu, 21 Aug 2008 12:33:21 -0700
>> From: Ernest Montague <afm199 at>
>> Subject: Re: Breaking-up/sputtering under load
>> check fuel ( look at plugs for bone white) and also check primary coil
>> connections.
>> On Aug 21, 2008, at 9:26 AM, Wayne Beaver wrote:
>>> Did a track day at NJMP/Thunderbolt yesterday, which was great fun
>>> until the
>>> bike started acting up (which, unfortuantely, was mid-way through
>>> second session).
>>> The bike feels like it's missing in various parts of the RPM range,
>>> which
>>> changes slightly depending on which gear the bike is in. It often
>>> misses between
>>> 5 and 6k, then again between 8 and 9k. Won't climb above 7k in top
>>> gear. Seems
>>> to run fine at idle and through rev range when parked. Only slight
>>> blip between
>>> 5-6k in first gear.
>>> Has something similar happened before to anyone here? Any ideas where
>>> I should start?

More information about the SV650 mailing list