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Post by sparky on Jan 1, 2010 15:36:15 GMT
Back to the GPZ Ive had to make sure the battery is tip top charged to make sure she starts every time from cold but after the bike is warmed up and settles to a nice tickover she wont start up again until she has cooled down Absolutely no problem starting it from cold The choke is working fine but any idea why this is happening
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Post by guyver1 on Jan 1, 2010 16:04:49 GMT
correct amount of oil??
correct type of oil??
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Post by Burchy on Jan 1, 2010 16:05:38 GMT
That's got to be a mixture problem, I reckon. Its either the pilot mixture too rich, or the air filter is cloggy. Does it go with the throttle wide open on the button?
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Post by sparky on Jan 1, 2010 18:33:27 GMT
No it wont start with throttle wide open Birchy , and im running with K&N pod filter's . Ive read some where that the bikes run like a bitch with K&N's and would perhaps try and source a standard air box to see if it starts any better Ive got the bike ticking over a treat but only when its warmed up but it starts ok with the choke out from cold . Ive got the recommended oil in it as well guyver and the level is spot on
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Post by brakeline on Jan 3, 2010 6:55:47 GMT
Funnily enough I had a car like that, but fu***d if I can remember why. Never got it sorted though .Sorry this is no help at all
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Post by lightspeed on Jan 4, 2010 16:37:41 GMT
My ZRX has had pods on it for years now and they have never been the source of a starting problem although I did have to tuck the carb vent tubes under the side covers to stop the sidewind surging.
It sounds to me like you might have a idle/pilot jet screw setting problem.
Does your exhaust smell like gas? Any sooty deposit around the exhaust outlet that might indicate a too rich setting? Do you need to use the choke/enricher when it is cold or will it start without it?
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Post by sparky on Jan 4, 2010 17:27:14 GMT
None at all lighty , and the fumes dont smell gas'y. Ive not tried starting the bike without any choke but im sure she wont Ill update you pronto ...just to add that she will fire up on full choke then after a minute or so push the choke into half then full in once warmed up. When she's warm she will tickover lovely with a crisp throttle response
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Post by lightspeed on Jan 4, 2010 19:46:55 GMT
If it won't start cold without the choke/enricher, and no sign of running rich, then that would seem to rule out screws adjusted too rich. I'm wondering about too lean? Won't start when warm with the choke either? I'm puzzled by what else might be changed in the "engine starting" routine due to the engine being warmed up.
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Post by brakeline on Jan 5, 2010 6:36:34 GMT
ah some old warm engiines can be difficult to start, methinks its a old problem, seem to remember somebody explaininit to me but cant still remember Have a lok at this, could be a possible explanation www.buzzle.com/editorials/4-18-2005-68707.aspHope it helps
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Post by sparky on Jan 5, 2010 16:29:10 GMT
The only thing im doing differently is just letting the bike warm up while stationary so the bike is getting quite hot seeing as there is no air flow over the air cooled engine to keep it from over heating , dont know if that would make a difference The bike wont start without choke but it does try to fire , then as soon as the choke is activated she will fire up so all is well that side . Thanks for that link Brakey it mite be one reason why this ole kwak dont like to be warmed up too much without being cooled down but guess thats a long shot . I could possibly try and turn the air screws out one more turn if she's running lean
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Post by lightspeed on Jan 5, 2010 19:13:08 GMT
If it does start when warm, with a bit of choke, then my guess is that it is running a bit lean on the pilot circuit and may just start fine with a wee bit of tweeking of the pilot screws.
Once its on the road, other parts of the carburation system control the mix, so it may run just fine there, but be just a tad lean to start.
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Post by sparky on Jan 5, 2010 21:17:45 GMT
That does sound like it could be the answer lighty Ill give it another tweek and see what it does , ill also try with a bit of choke when shes warm and see if she starts that way first . Bloody bikes eh .......i love em
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Post by ZRX Gremlin on Jan 5, 2010 22:31:15 GMT
Firstly, don't do that. Secondly, keep the bike as your winter hack. That way it isn'tgonna get as warm. Lastly, take longer tea breaks while you're out to allow it to cool still further. HTH.
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Post by sparky on Jan 6, 2010 9:36:15 GMT
Always plenty of tea breaks grem
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Post by hairydogboy on Jan 31, 2010 2:07:34 GMT
Have you considered different plugs? are you running standard plugs or ones designed for tuned motors? my money would be on the plugs,had a similar problem with my m8's enfield.
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