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Zx6r carbs on 1300 ford crossflow
shedman - 27/5/12 at 12:08 PM

Hi I have just fitted zx6r carbs to my crossflow .an just fired the engine up this morning but runs very rough the only thing i have done screwed the idle jets in an out 2/half turns this has helped still to balance them up as well . Has anyone ever done this on a crossflow it was just to some idea of main jets sizes any information on this would be very welcome cause I haven't a clue . Thanks

whitestu - 27/5/12 at 03:58 PM

I have ZX6Rs on my Zetec 2.0 with 1.6mm mains.

Stu

shedman - 27/5/12 at 05:09 PM

Cheers stu seems a lot of you guys are running 1.6 jet sizes or anything from 1.3 to 1.7 /. 1.6 being the norm . The jets that are in just know outside ones are 1.4 the two insides are 1.5. So I was going to start there. Do you know how to check for lean fuel is it a case of checking the plug colour. Thanks for the reply.

jacko - 27/5/12 at 06:27 PM

The only safe way is to get it set up on a rolling road
I would start with 1.5 jets and work up
After drilling the jets get the carbs balanced and go from there
Jacko

coozer - 27/5/12 at 07:43 PM

If its running rough the carbs probably need balancing. When mine are out of balance my zetec runs really rough, hunting and barking...

whitestu - 28/5/12 at 08:12 AM

quote:

Do you know how to check for lean fuel is it a case of checking the plug colour


As Jacko said a rolling road is best, however mine were done at home using a wideband AFR meter.

Stu

deezee - 28/5/12 at 09:36 AM

You are going to struggle tuning an engine, with a set of motorbike carbs, without any diagnostics available to you at all! There is no default jet size, needle position or idle mixture for any given engine. Everyone has a different air filter, exhaust and manifolds. I had to put a wideband on my car to get it running and then drive it, and tune it as I went.

shedman - 29/5/12 at 12:09 AM

Thanks guys all the info has been taken onboard .will have a go an let you know.