Could it have been the fuel?

Drew · Banned Joined: 09 Aug 2006 Karma :

Hi,

Had bike since august last year.

Since i have had it, on every outing, i start getting a misfire, or bike cuts out when i stop at a junction (starts again fine usually) - also i always had (in every gear) a hesitation at around 8000 revs.

Went out last Saturday morning for around 20 miles, misfiring/stuttering
Went out last Sunday morning - same as above.

I needed fuel, so instead of normal, i put in by ultimate (super unleaded)

been out 2 times since filling up with the super unlead, and bike has run perfectly, no misfire, no stutter, and even the hesitation at 8000revs has gone.

The bike has a timing advance plate on it - which i did read on these forums something about they take advantage of the super plus fuel

Could my misfire troubles be finally over due to the use of the higher octane fuel???

cokker · Spanner Monkey Joined: 22 Mar 2006 Karma :

Did you fill up at a Tesco?

They had a dodgy batch of fuel just over a week ago.
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iooi · Super Spammer Joined: 14 Jan 2007 Karma :

Would appear to be.....

Or it could simply be that the timing has been set wrong.
What bike is it ?
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Drew · Banned Joined: 09 Aug 2006 Karma :

cokker - no not been to tescos, also its been like this for months, not just due to one fill up.

iooi - gsxr-600 (98) sorry i didnt add that

LeeR · World Chat Champion Joined: 12 Dec 2006 Karma :

Do you use it daily or just occasionally?

I ask this because unleaded fuel starts to break down after 2 weeks, it goes "stale" and is less efficient. As an alternative to using Super unleaded you might try a fuel additive such as Pro-FST or one which slows the deterioration.
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Ichy · World Chat Champion Joined: 15 Jul 2005 Karma :

The aftermarket timing advance will make your bike a bit sensitive to differences in fuel. My bike can feel completely different if I try different petrol stations. Tickover becomes erratic and I loose some top end power.

Drew · Banned Joined: 09 Aug 2006 Karma :

Bike stands Mon-Fri, but out most weekends.

Ichy, when i have been using normal petrol, my idle use to be erratic like you say, would go from 700 up to 1100 then drop back to 700 and repeat. Now just sits practically on same revs.

Hoping it was a fuel issue and i can finally have some trouble free miles Smile

Ichy · World Chat Champion Joined: 15 Jul 2005 Karma :

I suppose the easy way to find an answer is to fit the original plate back on.