blakep82
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| posted on 27/12/08 at 07:37 PM |
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drilling zx9r carb main jets
what size should my jets be drilled out to for a 2 litre ecotec? 1.6? 1.7? 1.8?
is there anywhere i can buy them already drilled? i have a horrible feeling i'd end up breaking the drill, or end up ovaling the hole if i did
it myself. plus these drills seem pretty expensive
[Edited on 27/12/08 by blakep82]
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coozer
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| posted on 27/12/08 at 07:47 PM |
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No need to worry about drilling them, the jets are soft so if you use a pillar drill they just go straight through as your not taking much metal off.
1972 V8 Jago
1980 Z750
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blakep82
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| posted on 27/12/08 at 07:52 PM |
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ah, haven't got a pillar drill  i have got one of those stands for putting a normall drill into, but its rubbish...
is it soft enough to do by hand with one of those hand drill things?
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jacko
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| posted on 27/12/08 at 07:56 PM |
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DONT use a pillar drill
put the drill bit in a vice and just twist the jet on the drill by hand very easy to do
My jets are drilled out to 1.7 on a 2.1 pinto in zx9r /e carbs so if i were you i would start at 1.6
Jacko
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blakep82
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| posted on 27/12/08 at 07:59 PM |
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sounds easy enough actually.
will i need to change the needle too? i have no idea
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jacko
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| posted on 27/12/08 at 08:01 PM |
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NO you may have to lift them on the clip or if like my carbs put washers under the head of the needles
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jacko
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| posted on 27/12/08 at 08:07 PM |
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In the photo you can see holes in line with the needles when boggs set my carbs up that blocked them off with alloy welding wire to stop the fuel /air
mix getting to week at high revs
I dont know if you will need to do this some people dont have it done
 
carb
Jacko
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blakep82
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| posted on 27/12/08 at 08:13 PM |
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I'm using different carbs to these now. haven't had a look at the new ones properly, but i'll bear that in mind. cheers 
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jacko
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| posted on 27/12/08 at 10:24 PM |
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I recommend you get it on a rolling road when you get it going they will set it up spot on for you
Jacko
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blakep82
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| posted on 27/12/08 at 10:51 PM |
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thats a good call, something i will def do.
just wondering though, by redrilling them, how much metal will be taken out, or rather what size will they be now? can the car 'run' as
they are now? what effect will this have on emissions? will it run real lean? can i richen the mixture up to compensate til its ready to go to boggs
or the likes?
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will121
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| posted on 28/12/08 at 09:56 AM |
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quote:
is there anywhere i can buy them already drilled? i have a horrible feeling i'd end up breaking the drill, or end up ovaling the hole if i did
it myself. plus these drills seem pretty expensive
[Edited on 27/12/08 by blakep82]
you can buy larger jets from a motorbike shops especially if they have a dyno but about £3 each, dont drill to large at first as cant make it smaller
again. as a basic Idle screw does low rev mixture , nedle mid range, main jet size mid to top end.
A rolling road run is best for final set up but i managed to get my mixture fairly good with just a narrow band lamba and indicator.
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Danozeman
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| posted on 28/12/08 at 10:09 AM |
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Id start with 155 and see what u get. It will run as it is just maybe a bit lean flat out. What jets have u at the moment? 130?
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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