Stuterring CBR 600F

Straker · Renault 5 Driver Joined: 08 Oct 2009 Karma :

Hi All,

My CBR600F has developed a stutter. Only happens when cold. Will stutter above 3k rpm for the first couple of miles then be ok. I assume this is a minor issue that could be solved with a service. Plugs? fuel line? carbs? Any ideas gratefully received. Apologies for my mechanical ignorance.

cheers
Straker
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Current: CBR 900 RR3 (954 Blade)
Previous: CBR 600 FY (01),
09 Triumph Street Triple R (nicked), R6 (04), CBR 600 FX (00), GPZ 305 (lol)

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

A service may well fix it but just be aware that it is also a sign of a failing coil. On the CBR FY each plug cap has a built in coil.
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https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

Straker · Renault 5 Driver Joined: 08 Oct 2009 Karma :

Thanks for the tip. Will definitely get that checked out.
____________________
Current: CBR 900 RR3 (954 Blade)
Previous: CBR 600 FY (01),
09 Triumph Street Triple R (nicked), R6 (04), CBR 600 FX (00), GPZ 305 (lol)

UKRedwing · Trackday Trickster Joined: 15 Apr 2009 Karma :

Does the FY have carb heaters? Or is it fuel injected? On the phone and cba to google. Because you've said it's only happening when it's cold I would say its carb icing assuming its carbed...

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

Blaming carb icing is like blaming the Esso for the price of fuel. Generally carb icing is caused at high throttle opening due to the venturi effect rapidly cooling the air. It can't occur when the bike isn't moving. Now frozen carbs are a different thing altogether.

FY is carb by the way and they are heated by the cooling system.

A fair few people recommend a fuel additive, Pro FST, for better running during the winter. I never needed it so I've not tried it.
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https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

UKRedwing · Trackday Trickster Joined: 15 Apr 2009 Karma :

Well I suggested that as the prpblem as my friend had a 1997 GSXR 600 SRAD that suffered terribly in the winter from carb icing, it was worst when slowing down and pulling away at roundabouts etc

Noxious89123 · World Chat Champion Joined: 10 Jun 2007 Karma :

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

No I know what I meant, I don't make mistakes, ever. Errrr its like a ummm secret thing y'know?

(Nonchalantly walks away whistling while planning a shifty little edit)
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https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

tk338 · Nitrous Nuisance Joined: 29 Apr 2010 Karma :

I'm convinced my fy's problems with stuttering and powerloss, were fuel pump related... I'll link you too the thread when I get on a pc Smile