Idle mixture by exhaust temp?

Yes it's a great bike, so impressed with the engine, it sounds like a 1000cc when its revved, starts & idles sooo clean, it is what sold us on it when we bought it, I wish the FZR ran as well however the FZR goes like a shot so shouldn't be fooled by the idle.
I'm happy with the wire feeler as a gauge to balance the carbs now the results are in, certainly good enough for the road, that's right, the FZR today was spot on with the vacuum gauges too, I did adjust them but only a minuscule amount.
I had to make the 4 vacuum tube adapters as the fzr had nothing only 4 screws blanking off the holes. I got 4 M6 x 16mm bolts & drilled them out right through 3mm then drilled a 4mm in the bolt head end about 5mm deep to accept a piece of 4mm brass tube soldered in, all worked well & is a permanent improvement if I ever need them again.
I shot the temps again on the fzr & she runs a bit hotter than the CBR, maybe due to the EXUP valve holding up the flow at idle?? but interestingly cyl 2 was hotter by about 90 deg, I didnt go there, I've had 2 days working on them & had enough fun by then & happy with the result. The FZR will be stripped down in 12 months for a restoration so she can wait, but she read about the same temps as the ZXR750 & same hot cylinder, it's just coincidence but interesting.
It's all confusing, nothing concrete re jetting 4 cylinder engines.
How's this, my zxr750 1994 has the 2 centre cylinders richer & I think we followed that when we fitted the Factory Pro kit, the next basket case we did was dads gsxr750 1997 & it's the opposite, the 2 centre cylinders are leaner but we also got a Factory Pro kit for it & we ended up using all 4 with the same size jets thanks to Jamie at Sportscycles at Gateshead on his dyno (120 rear wheel hp !) long story that one.
PS the CBR is for sale if anyones interested, not cheap but a real good one.

 

I haven't seen or heard of using the wire anywhere, I just tried it once & seemed to be ok, looks like it's pretty accurate but still can't beat the vacuum guages.
The ZXR jet set up is from factory, we went down the carby road when we couldn't get her to go, bought a basket case & did a rebuild/restore, everything was in order & surgically clean then we found someone had substituted one of the carbies with an earlier year model unit, same body but completely different jetting & needle & all the pollution & airbox hosing was off it & in a box. That's when we learnt how critical it all was, & they're all the same, no air box no go, even changing the air filter from std to K & N affected it not to mention the Hindle 4 into 2 then into 1 exhaust & muffler. Funny I went for a ride on Sat with Dad & only got a couple Km's down the road & she played up, turned around & went home to find the crankcase breather & anti backfire breather tubes not connected to the air box, so critical, only because the airbox was bleeding through the hose holes.
Jetting with all 4 the same works for the GSXR on the dyno & probably the same for everything else, we went with the Factory Pro settings on the ZXR as they know more than most, they raced the Yoshimura team & gave them a good run. I know it's a bit sad having something fit to race & on the road but I can't help it & it is such a pleasure to ride when the throttle is opened & that power is realized with such ease.
I'd love to know why richening up will cool the cylinder, I get it in 2 strokes but not 4's. I know a lubricant engineer, I'll send him an email & see if he know's.

 

I'll bet it sounded nasty, never done that.
Now you'll have all the young blokes everywhere trying it !
You can get a flame out of a short header pipe, probably not much quieter either

 

Ok, interesting. Sarting to see how it's possible, must be an evaporation / heat transfer thing or a cooler burn with an efficient air fuel mix.
I'll do that email now, I've got 5 min spare.
Will's over in your backyard in Vientene, Laos ?? spell check! travelling through Thailand from Bangkok then north to the border & then down through Laos, Vietnam & Cambodia & back to Thailand, he's bored in Vientene, hired a 125 scooter, sounds like he went for capacity to tow both of them & he's loving it. Anything worth seeing ? I told him to talk to the locals & find out what they do for entertainment, cock fights etc maybe, not sure what goes on, no english there but Tess speaks French which helps sometimes.

 

I understand, theyre on the Mekong most of the time so far so no beaches, he's not really a beach boy anyway.
The bike hire has offered a new freedom that they are enjoying seeing sights that they otherwise wouldn't have.
Next time the GSXR is here I'll take some temp shots & see how they look out of interest, she's in perfect tune like the ZXR but she's pretty hot, cams, pistons, exhaust, carbies & god only knows what else internally, at that stage we didn't get into the engine too deep, didn't think there'd be anything there but now we have to believe there is, they just don't make that sort of power without serious work.

 

Oh good , that makes me feel better. Haven't heard from him for a few days now either !
Not in Thailand now, flew to Hanoi, thats probably worse.