Gpz750 problem

Arold · L Plate Warrior Joined: 11 Apr 2015 Karma :

I have an '83 gpz 750. Rebored to 810. 4 into 1 harris exhaust. I can't get the pilot mixture right. Standard jets are 37.5 and are too lean. I upjetted to 40 which are too rich. I don't think inbetween sizes are available. Any suggestions?

andym · World Chat Champion Joined: 16 Nov 2010 Karma :

What air filter have you got on there?

Arold · L Plate Warrior Joined: 11 Apr 2015 Karma :

Got the standard air filter.

andys675 · World Chat Champion Joined: 08 Feb 2007 Karma :

if jets are available between those sizes you'll be able to get them from https://www.allensperformance.co.uk/
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temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

what are your idle screws set at?
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bypass2 · Spanner Monkey Joined: 12 Sep 2013 Karma :

What about the throttle slides needle clips groove position.What groove is it

Arold · L Plate Warrior Joined: 11 Apr 2015 Karma :

The Needles control the mixture above 3k revs. My problem is below that, with the pilot jets isn't it? The needle clips are set to standard in the middle.

Vincent · Banned Joined: 16 Oct 2006 Karma :

Is the rebore a recent mod? If not, has it been running OK at some time? If the rebore is recent, 'thought about a using a dyno? There not as expensive as some folks think and can save a lot of grief.
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ZRX61 · Victor Meldrew Joined: 05 Nov 2003 Karma :

It's not the pilot jets causing the issue, it's mixture/air screws etc.
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