Cbr600 cutting out when pulling away...

[BuzzBravado]

....and it is doing my tits in. Any pointers on where to start? If I rev it harder when pulling away it lowers the chance of it cutting out, instead it might drop a cylinder until it clears its throat. Also cuts out if I try to very quickly blip the throttle. Increasing the throttle at a regular pace is fine. Idles fine at 1k. It's the last of the carb models.

[sjtscott]

Which model and year? Carbs so a 2000 I'm guessing?

[BuzzBravado]

Yeah the "fy fx" model

[Steve Bass]

Carb overhaul time I'd say. Sounds like it's passing enough fuel for tick over but not enough for load.

[BuzzBravado]

Steve Bass said:

Carb overhaul time I'd say. Sounds like it's passing enough fuel for tick over but not enough for load.

Time for a new bike you say. Well if needs must

[Steve Bass]

BuzzBravado said:

Steve Bass said:

Carb overhaul time I'd say. Sounds like it's passing enough fuel for tick over but not enough for load.

Time for a new bike you say. Well if needs must

Good use of the ManTranslator

[pozi]

Before you get too carried away 1000 rpm is to low for a carbed 600, it should be 1250-1400.

Set everything and sync up the carbs as per the manual first making one change at a time, then diagnose from there.

[BuzzBravado]

On closer inspection it idles at 1300 and sounds happy there. This morning filtered right to the front, no doubt ruffling some feathers, where i prompted stalled the bike twice taking away and holding people up. Felt like a right plum.

[Prof Prolapse]

I think you should break it and sell me the engine.

[sjtscott]

Steve Bass said:

Carb overhaul time I'd say. Sounds like it's passing enough fuel for tick over but not enough for load.

Sorry I didn't reply further yesterday OP, would agree with Mr Bass' suggestion since it doesn't sound at all electical and I would assumed you have checked plugs/leads/coilpacks already.
Also I was asking because I had a 2003 F4i model which I know more about as I haven't ever owned a carbed CBR6

[BuzzBravado]

Yeah it looks that way. A pain because it is my daily, and will likely be off the road for some time. If the carbs are coming out, i may as well do the valve clearances at the same time.

Its now on 13k miles, with no evidence of any real servicing beyond oil/air changes.

Sigh!

[Hooli]

Sounds like carbs here too.

13k is nothing, so the carbs are probably gummed up with old fuel from lack of use.

[moanthebairns]

pozi said:

Before you get too carried away 1000 rpm is to low for a carbed 600, it should be 1250-1400.

Set everything and sync up the carbs as per the manual first making one change at a time, then diagnose from there.

I have a similar issue, I'm hoping with syncing the carbs this winter it will cure it, but it does bog down mind range. So could be anything from fuel lines, to filter, to leads.

I am hoping its these as I don't fancy a carb strip and rebuild but I suspect its a gummed up needle or something. Its probably one of those jobs that's easy once you've done it.

[Hooli]

Redex in the tank is worth a try, it can clean smaller deposits.

[Prof Prolapse]

If the engine is only on 13K does it need the clearances? I know in an ideal world etc, but is the mileage indicated by the service interval not double that?

I did them on my CBR600FX and I wish I hadn't and it went without issue. Fiddly fking stty job.

Then again some people like that sort of thing.

[BuzzBravado]

The mileage works out less than 1000 miles per year, so it is could be gunked up. But this is a new issue, and it had been doing 250 miles per month since April. I'll run a bottle of seafoam or the like through it just in case, but that tends to be wishful thinking.

I'm thinking it could one of the plugs breaking down?

Edited by BuzzBravado on Tuesday 3rd November 12:34

[BuzzBravado]

Prof Prolapse said:

If the engine is only on 13K does it need the clearances? I know in an ideal world etc, but is the mileage indicated by the service interval not double that?

I did them on my CBR600FX and I wish I hadn't and it went without issue. Fiddly fking stty job.

Then again some people like that sort of thing.

There is a light tick, which could be normal, i have nothing to compare it against as its my first bike. A little online reading suggests the "F4" gets the clearances done around 16k.

[EvoBarry]

I highly doubt the clearances will be out of tolerance, my Fazer600 was still fine at 34k when I eventually had them checked

As for the cutting out, if its cutting low down but working fine higher up the range I still think its spark breaking down rather than fuel per se. When did it last get plugs?

[Steve Bass]

BuzzBravado said:

I'm thinking it could one of the plugs breaking down?

Not knowing the history of the Plugs, it'd be worth changing them out as it's a quick and easy fix. Fingers crossed that'll sort it but it might also be gunk from the tank in one of the carbs. Have you checked the fuel filter to see if there's signs of particles or gunk in there??

[Hooli]

I bet the clearances are fine. Last time I checked mine at 100k they were still within tolerance & that's with crappy suzuki build quality. The comment on changing plugs is a good one too, lower revs means lower gas speed through the carb & manifold so the fuel mixture often isn't fully atomised so it's harder to light.