Danozeman
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| posted on 28/9/08 at 10:00 AM |
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Zetec, bike carbs and megajolt help please.
Im still having troubles getting my car to rev freely. Its been like this since i put it all together.
When i rev it gently it will rev up ok. but if i try to rev it hardish it bogs down. I have tried loads of maps and various different settings but
no different.
The carbs have 1.6 jets and the air by pass thing blocked up. I was playing with it yesterday and got it to rev more free, i thought id sorted it but
when i drove it it bogged down again. Its okish over 3-3.5k.
1.8 zetec, megajolt and zx9r carbs.
Any ideas? Its really annoying me now as i cant get it right.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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marmot0
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| posted on 28/9/08 at 10:07 AM |
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have you checked the timing
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paulf
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| posted on 28/9/08 at 10:14 AM |
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Are the needle heights adjustable? You could try adjusting them up or down a notch if so, also are you using a fuel pump giving the correct pressure
for bike carbs?. I recently helped someone set up bike carbs and megajolt on a pinto , he was having similiar problems and eventually found one of the
air bypass jets to be partially blocked.
Paul
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whitestu
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| posted on 28/9/08 at 02:26 PM |
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I've got the same setup but ZX6R carbs.
You can have a copy of my MJ map if you want.
I guess I've been lucky as mine has always worked perfectly.
The needle position on mine only makes a very minor difference.
The fuel pressure is worth a check though. I'm using a ZX6R pump as well.
Stu
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David Jenkins
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| posted on 28/9/08 at 03:33 PM |
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Sounds a lot like my original bike carb problem - OK at low revs, really strangled at higher revs. In the end I connected up my JAW AFR meter and
found that I was far too rich at wide open throttle. I originally had 1.6mm main jets on a 1660cc x-flow - now I have 1.3mm.
What colour are your plugs after a run? (not after a period of tickover - hard blast, stop, check plugs). Mine were really sooty before I fixed the
problem. This is not a scientific test, but it may give a clue.
Do you have a lambda sensor boss on your exhaust by any chance? If so, I can try my AFR meter on it - if not... well, I don't have any way of
holding the sensor up the exhaust!
cheers,
David
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Danozeman
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| posted on 29/9/08 at 08:16 PM |
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quote:
Are the needle heights adjustable? You could try adjusting them up or down a notch if so, also are you using a fuel pump giving the correct pressure
for bike carbs?. I recently helped someone set up bike carbs and megajolt on a pinto , he was having similiar problems and eventually found one of the
air bypass jets to be partially blocked.
The needles are fixed and im running a r6 pump so quessing thats ok for pressure. Its seems to be more over fueling than under.
Whitestu a copy of your map would be good if u wouldnt mind. Just to see how different it is to mine.
I changed to smaller jets and it made no difference. They were 190's i took out and 155's i put in.
The carbs were set up by bogg brothers which is the annoying thing.
David thanks for the offer of AFR but i have no boss so would be a bit arkward. Im gonna take it to work and get it on the smoke tester to see what
its doing. Then i can drive it aswell.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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rusty nuts
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| posted on 30/9/08 at 05:54 PM |
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Dan Can you get hold of an old cat from work and remove the boss from that to weld in? May be able to help if you get stuck.
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Danozeman
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| posted on 6/10/08 at 08:58 PM |
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Rusty good idea but they would be mild not stainless.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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