Bike starts up but occasionally spits back out of the carborettors.
Can anyone help?
Many thanks in advane
Hello Guest User,
Please feel free to have a look around the forum but be aware that as an unregistered guest you can't see all of it and you can't post.
To access these 'Registered Users Only' areas simply register and login.
Please feel free to have a look around the forum but be aware that as an unregistered guest you can't see all of it and you can't post.
To access these 'Registered Users Only' areas simply register and login.
Z9 A4
Moderators: chrisu, paul doran, Taffus, KeithZ1R
Re: Z9 A4
I'd start with:
Valve clearances
Leaky valve seat
Incorrect ignition timing
..
Valve clearances
Leaky valve seat
Incorrect ignition timing
..
http://www.airevalleyclassics.co.uk
10% discount code Z1OCTEN
Keyster rebuild kits & carburettor spares - airscrews, jets, needles, starter plungers & gaskets.
Also petrol/ethanol proof float bowl gaskets. IMD pistons preferred seller.
10% discount code Z1OCTEN
Keyster rebuild kits & carburettor spares - airscrews, jets, needles, starter plungers & gaskets.
Also petrol/ethanol proof float bowl gaskets. IMD pistons preferred seller.
-
- 100Club
- Posts: 303
- Joined: 3rd Aug 2013
- Location: Australia
Re: Z9 A4
DonB wrote:Bike starts up but occasionally spits back out of the carborettors.
Can anyone help?
Many thanks in advane
Hi Don, Never got the bottom of this one ! I think it may be induced by a slightly lowish vacuum when cold ....my one has always done this on occasion it can spits a couple of time whilst cold then it settles !!!!!! Can tell you now lots of other Kawa 900,s do it too & as soon as the motor has warmed up a bit, it normally disappears & it's not then seen again until another cold start up down the line . You can check your plugs/caps/leads & coils ,valve clearances, compression & timing etc as that won't hurt.... as any of those with issues can encourage spit backs ......but to be totally honest my motor is very good internally 140 psi on all cylinders- Mk2 ignition - s/Steel valves-dialled in std Cam's & everything is spot on = recently fully rebuilt by me & it used to do that too prior to the full rebuild I did that wasn't even called for...I'm just a bit OCD haha ! If it doe'snt do it when it's hot.. best ignore it & just enjoy the bike Don as there no point chasing a disappearing shadow ! All the best Johny B.
Re: Z9 A4
Sounds like valve timing may have slipped. Don't try to start it until this and shim gaps are checked as per the service manual
Re: Z9 A4
Agree with Johny that some spitting when cold is fairly normal. If it's still doing it when warm then my original advice still stands.
http://www.airevalleyclassics.co.uk
10% discount code Z1OCTEN
Keyster rebuild kits & carburettor spares - airscrews, jets, needles, starter plungers & gaskets.
Also petrol/ethanol proof float bowl gaskets. IMD pistons preferred seller.
10% discount code Z1OCTEN
Keyster rebuild kits & carburettor spares - airscrews, jets, needles, starter plungers & gaskets.
Also petrol/ethanol proof float bowl gaskets. IMD pistons preferred seller.
Re: Z9 A4
Ultim8pc wrote:Agree with Johny that some spitting when cold is fairly normal. If it's still doing it when warm then my original advice still stands.
Mine 'coughs' through the exhaust a bit when cold but my thoughts are are that spitting back through the carbs implies an inlet valve is opening during combustion or on a wasted spark.
Re: Z9 A4
ZedHead wrote:Ultim8pc wrote:Agree with Johny that some spitting when cold is fairly normal. If it's still doing it when warm then my original advice still stands.
Mine 'coughs' through the exhaust a bit when cold but my thoughts are are that spitting back through the carbs implies an inlet valve is opening during combustion or on a wasted spark.
Can be fuel icing.
And on the 7th day... Zeds were created!
Re: Z9 A4
ZedHead wrote:Ultim8pc wrote:Agree with Johny that some spitting when cold is fairly normal. If it's still doing it when warm then my original advice still stands.
Mine 'coughs' through the exhaust a bit when cold but my thoughts are are that spitting back through the carbs implies an inlet valve is opening during combustion or on a wasted spark.
I would agree, if it does it when warmed up.
http://www.airevalleyclassics.co.uk
10% discount code Z1OCTEN
Keyster rebuild kits & carburettor spares - airscrews, jets, needles, starter plungers & gaskets.
Also petrol/ethanol proof float bowl gaskets. IMD pistons preferred seller.
10% discount code Z1OCTEN
Keyster rebuild kits & carburettor spares - airscrews, jets, needles, starter plungers & gaskets.
Also petrol/ethanol proof float bowl gaskets. IMD pistons preferred seller.
-
- 100Club
- Posts: 303
- Joined: 3rd Aug 2013
- Location: Australia
Re: Z9 A4
Ultim8pc wrote:ZedHead wrote:Ultim8pc wrote:Agree with Johny that some spitting when cold is fairly normal. If it's still doing it when warm then my original advice still stands.
Mine 'coughs' through the exhaust a bit when cold but my thoughts are are that spitting back through the carbs implies an inlet valve is opening during combustion or on a wasted spark.
I would agree, if it does it when warmed up.
Roger that........were on the same page !
Who is online
Users browsing this forum: Bing [Bot] and 92 guests