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 Post subject: re-jetting bike carbs
PostPosted: Mon Jan 16, 2012 4:02 am 
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Location: North west. Widnes.
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ok so i have had no luck finding a set up for my car so guna buy everything indivually... any idea on how the hell to re-jet a bike carb? iv seen people mention drilling the old jet slightly bigger? how do i kno how much bigger alsooo will the like's of any performance managment run any set of carbs ?

or would it be much easier to buy a set of gsxr1000 throttle bodies and run my own fuel rail? again will i need upgraded fuel rail or would a standered zetec rail work? pretty clueless with this so as much help needed pleasee :)

cheers sean

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PostPosted: Mon Jan 16, 2012 10:27 am 
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what engine are you looking to put the bike carbs on? i run a set of ZX6R carbs on a 1600 CVH XR2 engine in a kit car and a set of GSXR750 throttle bodies on a 2 litre zetec.
First question i would ask is what engine and what year car basis of do you need to run a Cat for emmisions at MOT?

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PostPosted: Tue Jan 17, 2012 11:15 am 
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its a 2.0ltr zetec i dont have a cat at the min and emissions isnt a problem as it a track based car for now :)

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Last edited by Seanymk2 on Fri Jan 20, 2012 6:18 am, edited 1 time in total.

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PostPosted: Tue Jan 17, 2012 1:05 pm 
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Drives: Fiesta 1.4 cvh
i think it was 0.8mm you needed to drill the jets out to, but have you looked at buying 0.8mm diameter jets for your carbs?? as jets usually have a tapered hole, so they give a better spray pattern, if not, give bogg brosa ring as they do all that sort of stuff for the zetec engines, also worth looking on xrtwo.com as the chaps on there are very helpful when it comes to bike carbs on a zetec


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PostPosted: Tue Jan 17, 2012 9:19 pm 
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Drives: 2litre Si
if purely a track day car then i would considded bike carbs as a cheaper alternative to throttle bodies and stand alone ECU.
I started of planning to use ZX9R carbs and respaced them and made a manifold as photo in my link and brought a stand alone webcon 2D ignition only ECU but ended up going with GSXR750 throttle bodies and Emerald ECU.
The ZX6 carbs i have on the CVH i think run 150 main jets, zetec expect to be larger, i brought a few sets of jets at £4 each from a motorbike RR shop rather than redrill and checked mixture with a basic narrow band lamba gauge and made adjustments to jets, needle position and idle mixture screws and runs well.
I still have the 2D ignition ECU if interested?

If you are thinking of throttle bodies say £100, ECU £300-£600 and then paying a RR to map £300 its not cheap.

One thing to also considder is need to reduce the fuel pressure with carbs either replacement pump or special fuel regulator

http://www.fiesta-si.com/forums/viewtopic.php?f=5&t=13734

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PostPosted: Thu Jan 19, 2012 2:09 am 
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ok so iv decided im going to go down the bike carbs rout and i can get hold of some zx9r carbs i can weld so a manifold isnt a problem if i was to get the 2D ecu of yourself does that just plug straight into my loom or will i need a seperate loom? also inbox me with a price if you like as im getting a tax re-bate in this month and im guna start getting stuff together

cheers again for all the help and again if you feel you could add to this please do so :)

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PostPosted: Thu Jan 19, 2012 10:29 pm 
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big red fezz wrote:
ok so iv decided im going to go down the bike carbs rout and i can get hold of some zx9r carbs i can weld so a manifold isnt a problem if i was to get the 2D ecu of yourself does that just plug straight into my loom or will i need a seperate loom? also inbox me with a price if you like as im getting a tax re-bate in this month and im guna start getting stuff together

cheers again for all the help and again if you feel you could add to this please do so :)


the ECU is a webcon unit orignally used for a 750 motor club Zetec race series, has a base 2D map for twin webbers so should be ok with motorbike carbs, could be re-mapped by a webcon agent to Full 3D if have a TPS on the carbs, it comes with a wiring harnes basically needs just a ignition live and neg with rest just plugs for coil and crank sensor.
Some more info here http://www.webcon.co.uk/Downloads/K97017%20(FLO383)%20Ver9.pdf

Also have a spare steel zetec inlet manifold flange if you are thinking of making a manifold, i respaced my ZX9 carbs which made fabricating the manifold easier as no compound curves.
Also a set of ZX6R carbs same as i have on my 1600cvh but these might be bit narrow spaced for a 2litre zetec.

After £100 for the ECU and £15 for the flange each plus postage

let me know if interested.

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PostPosted: Fri Jan 20, 2012 5:13 am 
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Location: North west. Widnes.
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yehh that sounds perfect mate just what im after i will deffinatly be in touch before the end of next week :) thanks again

sean

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