Good morning,
Suggestions please,
OK on tick over and 3000 revs +
Between 1800 and 2800 very flat, have to blip the throttle to pull off or it will die badly.
Seems to be worse when warm.
Had it set up on dyno a couple of months ago but problem still persist.
Thank you
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Z900a4 splutter
Moderators: chrisu, paul doran, Taffus, KeithZ1R
Z900a4 splutter
Past 5 Years
1974 UK Z1a, Candy Tone Brown/Orange
1976 KZ900a4, Diamond Dark Green
1978 KZ1000a2, Luminous Green
1976 KZ1000a1, Red
1972 GT750J, Candy Lavender
1974 UK Z1a, Candy Tone Brown/Orange
1976 KZ900a4, Diamond Dark Green
1978 KZ1000a2, Luminous Green
1976 KZ1000a1, Red
1972 GT750J, Candy Lavender
Re: Z900a4 splutter
Carbs are a lot trickier than injection to get right on a Dyno. Take it back to them
Re: Z900a4 splutter
I don't think it is set up probs, more something breaking down or blocked?? ☹️
Past 5 Years
1974 UK Z1a, Candy Tone Brown/Orange
1976 KZ900a4, Diamond Dark Green
1978 KZ1000a2, Luminous Green
1976 KZ1000a1, Red
1972 GT750J, Candy Lavender
1974 UK Z1a, Candy Tone Brown/Orange
1976 KZ900a4, Diamond Dark Green
1978 KZ1000a2, Luminous Green
1976 KZ1000a1, Red
1972 GT750J, Candy Lavender
Re: Z900a4 splutter
Just been out again, definitely worse as the bike gets warmer? No problem still over 3000 revs, ticks over perfect.
??
??
Past 5 Years
1974 UK Z1a, Candy Tone Brown/Orange
1976 KZ900a4, Diamond Dark Green
1978 KZ1000a2, Luminous Green
1976 KZ1000a1, Red
1972 GT750J, Candy Lavender
1974 UK Z1a, Candy Tone Brown/Orange
1976 KZ900a4, Diamond Dark Green
1978 KZ1000a2, Luminous Green
1976 KZ1000a1, Red
1972 GT750J, Candy Lavender
Re: Z900a4 splutter
BigZCas wrote:Just been out again, definitely worse as the bike gets warmer? No problem still over 3000 revs, ticks over perfect.
??
Usual suspects, if not carbs would be low voltage to the coils or something in the charge circuit breaking down. Maybe regulator or stator in that order.
Re: Z900a4 splutter
Try feathering the choke as you hit the flat spot to see if that cures it.
If so then it's a fueling gap coming off the pilots ( try lifting the needles a notch ) or partially blocked pilot circuit .
Stock air box or individual filters ?
If individual filters you may need air corrector jets fitting.
Bogging can also be the result of bottom end over richness and the revving can clear the excess fuel and plug fluffing so if the above doesn't work or makes it worse then try the bike with the air box or pods removed .
If you have pods and they are the cheap Emgo type then they could be the problem as they are actually more restrictive than the stock airbox.
If so then it's a fueling gap coming off the pilots ( try lifting the needles a notch ) or partially blocked pilot circuit .
Stock air box or individual filters ?
If individual filters you may need air corrector jets fitting.
Bogging can also be the result of bottom end over richness and the revving can clear the excess fuel and plug fluffing so if the above doesn't work or makes it worse then try the bike with the air box or pods removed .
If you have pods and they are the cheap Emgo type then they could be the problem as they are actually more restrictive than the stock airbox.
Re: Z900a4 splutter
Standard airbox.
It must be something that the Dyno did not pick up??
Thanks for suggestions, I'll try them one by one
It must be something that the Dyno did not pick up??
Thanks for suggestions, I'll try them one by one
Past 5 Years
1974 UK Z1a, Candy Tone Brown/Orange
1976 KZ900a4, Diamond Dark Green
1978 KZ1000a2, Luminous Green
1976 KZ1000a1, Red
1972 GT750J, Candy Lavender
1974 UK Z1a, Candy Tone Brown/Orange
1976 KZ900a4, Diamond Dark Green
1978 KZ1000a2, Luminous Green
1976 KZ1000a1, Red
1972 GT750J, Candy Lavender
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