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Gone From Stage 2 Head To Stage 3 - New Needle?


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#1 Burgerdale

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Posted 21 February 2014 - 11:39 PM

Hi, ive just swapped from a stage 2 head 33mm inlets to a stage 3 36mm inlets. Do I need a new carb needle? I'm running a hif44 with a metro cam and standard rockers.
also, would it benefit from a wider bore lcb and exhaust?
Thanks in advance

#2 Turbo Phil

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Posted 22 February 2014 - 12:05 AM

Presuming the head has improved flow, then yes the fuelling will need altering/correcting. As any increase in airflow will require the mixture to be altered to suit.

Phil.



#3 KernowCooper

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Posted 22 February 2014 - 12:27 AM

Whats needle in it now and what does it drive like?



#4 Burgerdale

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Posted 22 February 2014 - 08:11 PM

Not sure what needle at the mo. It drives like sh*t to be honest, im not happy with Steve hartleys at Sheffield at all. £450 to tell me what I told them what was wrong with it in the first place. They took the exhaust off to fit the head and didn't even bother to use exhaust clamps of at least fasten it to the box. They set the idle to 2k and couldn't do the timing because they didn't know the engine number.
It's currently leaking exhaust from everywhere and back firing every so often. It's lumpy as he'll upto 3k and feels down on power to the previous head.
I'm going to sort the exhaust out, then have a go at the timing before I look at the carb needle.
Thanks so far and ill keep you posted.

#5 KernowCooper

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Posted 22 February 2014 - 11:59 PM

Thats serious money for the outcome, if they cant set it up go somewhere else in future, thats a pretty lame excuse, see how you get on



#6 gazza01

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Posted 23 February 2014 - 10:24 PM

Shocking.






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