Run it rich or lean???

[Streaky100]

I have set my carbs up and the bike runs perfect in the daytime, but early in the morning when it's pretty cold and the air is dense , it seems to run a bit lean. I know on 2 strokes you would opt for a slightly rich mixture due to the lubrication, but is that the same for 4 strokes? Do I leave it as it is, or set it up for cold mornings and have it slightly rich in the daytime???

[Triton Thrasher]

Do you know what sort of bike it is?
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Rrrrrrrrrrrrrrrrrr

[Triton Thrasher]

Anyway, it should be set up to run properly when it’s warm.
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Rrrrrrrrrrrrrrrrrr

[MCN]

Almost all engines run lean when cold. Due to fuel condensation.

They are enriched for start up and for a period after start up to allow temperatures to optimise for normal running.

Around 45-50° Centipede.
That's a few minutes under low to moderate loading.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[chickenstrip]

Carb bike. No choke?
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Chickenystripgeezer's Biking Life (Latest update 19/10/18) Belgium, France, Italy, Austria tour 2016 Picos de Europa, Pyrenees and French Alps tour 2017 Scotland Trip 1, now with BONUS FEATURE edit, 5/10/19, on page 2 Scotland Trip 2 Luxembourg, Black Forest, Switzerland, Vosges Trip 2017
THERE'S MILLIONS OF CHICKENSTRIPS OUT THERE!

[weasley]

Are you saying that it runs lean when warmed up, on a cold morning? Rather than runs lean on cold start?
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[Streaky100]

It is a kawasaki gpz1100 and pulls great when warmed up in the faytime, but in the cold mornings, if I give it a handful of gas there is a hesitation before accelerating and it feels less powerful during the acceleration

[chickenstrip]

I presume it's a GPz1100B1 then, since as far as I'm aware all GPz1100s from the B2 on were FI?

If it's an FI model; on my GPz Turbo, the FI had an idle lever, which had three positions - off, fast idle, and bloody fast idle. Any effect, or does the 11 not have this? I can't remember from my GPz1100A that I owned briefly.
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Chickenystripgeezer's Biking Life (Latest update 19/10/18) Belgium, France, Italy, Austria tour 2016 Picos de Europa, Pyrenees and French Alps tour 2017 Scotland Trip 1, now with BONUS FEATURE edit, 5/10/19, on page 2 Scotland Trip 2 Luxembourg, Black Forest, Switzerland, Vosges Trip 2017
THERE'S MILLIONS OF CHICKENSTRIPS OUT THERE!

[Streaky100]

Ah, nope. It's the 1996 gpz1100E with the zzr1100 engine...defiantly carbs

[chickenstrip]

[MCN]

It will not run 'properly' until at 'normal' running temp. Or from the blue to anywhere in the green but never.in the red. (On a Mickey Mouse Temp. Gauge.)
You don't use full throttle until it's warm.
Give the auld cunt the respect it deserves and let it gather it's self.
Should be warm enough for you to wring it's neck after about 5-10 minutes.
Don't labour or hammer the thing until then.
And don't Colly-Moddle it either. Running rich too long presents it own issues.
Washing oil off the cylinder walls, diluting the oil, greening the planet and costing you money to fill with petrol.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[Streaky100]

I warm the bike up fully before I ride it at any time and can strip, clean, rebuild and adjust/balance carbs. The fact I am getting at is the cold morning air is denser than the warmer daytime air, therefor making the bike leaner in the morning conditions and wondering which would be kinder to the bike, slightly richer in the day or slightly leaner in the mornings as 4 strokes may be different to 2 strokes???

[MCN]

[Shaft]

[jaffa90]

EEERRR, put the dirty standard air filter back in or adjust the pilot screws to give more fuel or less air ( with an idle 1,000rpm) or set off on half choke for a few miles.

[vitus detritus]

All engines are liquid cooled - and the liquid doing the cooling is petrol. You can't break anything running it slightly rich.
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if it ain't broke, don't fix it

[Nobby the Bastard]

[Riejufixing]

[Streaky100]

the whole bike has been stripped and all bearings, bushes, seals EVERYTHING has been replaced with new...I guess that while riding the bike for years, any gradual deterioration of the fueling or rich/lean running hasn't been noticed (like you don't notice your kids growing up, but people who don't see them often do) but now it is sorted with new parts, I have noticed the difference....Oh and as for not warming it up and just taking it easy for the 1st few miles, I warm my bike up because I have a deserted arrow straight mile long road outside my house that i use in the mornings and I like to let my neighbors know I am off out to work at 4:30am

[Riejufixing]

[mentalboy]

[MCN]

[Triton Thrasher]

[ZRX61]

Go up one size on the pilot jets. My ZRX11 has essentially the same engine. I can fire it up, turn off the choke & ride away.
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[1198]

Once my zzr1100 (c1) will run semi comfortably with little or no choke (perhaps ten seconds or so after start) I’m off. I don’t pin it for a few miles and just take it easy. The choke is a bit fiddly as on full (to get it running) it then does the 1980s and 90s Kawasaki thing of trying to run at 4-5000 rpm which was (I’m told) deliberately engineered in for oil circulating reasons.
The ten seconds I mentioned earlier I’m sat using the choke to keep the rpm at about 2k as the sound of it at 4K or more goes against any mechanical sympathy I have on a stone cold engine.
Incidentally I hate my neighbour too but am not prepared to thrash a cold engine at silly o’clock am just to piss him off - it also wakes up Ms. 1198 too which doesn’t make me popular!