Setting Up Carbs & EGT

[JackButler]

I'm fettling my other wumman for a hard season of pure sexual abuse & treated myself to yet another tool for the workshop.

I bought one of those IR thermometers to aid in setting up the carbs fuel/air mixture but don't seem to get any sense out of the readings.

I know the thermo is fairly accurate, it registers boiling water at 100deg & ice at 0ish deg, but I don't seem to be able to get all four pipes at the same temp?

Will this ever work properly with OEM dual skin downpipes????
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I clean my guns with the tears of the snivelling, left wing scum.

[bikenut]

When engine has been running for a while, how cold are the carb bodies, consider carb warmers with may be fitted to yours...
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nuts about bikes

[redeem ouzzer]

[martin734]

I use a two-gas exhaust gas analyser and an air flow meter to set up the carbs on my bike.
I set up a baseline for the carbs, making sure that each carb has the same idle screw setting, same mixture screw setting and same airflow. I dismantle each exhaust to the collector box and stick the EGA probe into the downpipe. I do two tests, one at idle and one at 2000 rpm. The values I set my bike to are 0.45% CO and less than 35ppm HC at both idle and 2000 rpm.
CO values higher than 1%-1.5% indicate an engine that is running too rich. HC values higher than 40-45 ppm indicate unburnt fuel in the exhaust gas due to misfire.
No doubt some people will say that you are supposed to use a 5 gas analyser, for best accuracy and precision but for making sure your carbs are reasonably in tune I find a 2 gas analyser is fine. You can get a basic but accurate 2 gas analyser for about £150 and a carb airflow meter for less than £40.
I have never heard of setting up carbs with exhaust temp alone, I can't see that it would be that accurate as there are many variables that can affect the exhaust temperature. It can be used as an indicator that something might be wrong with a particular cylinder or carb, but I doubt it can be solely used to set up a carb.
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Current bike: ST1100 "Big Red"

[stinkwheel]

IR thermometers read the frequency of the infra red coming off a surface. If the surface is reflective, the temperature reading is not necessarily the temperature of the surface itself.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Robby]

This post is pretty much why people shouldn't go fiddling with fuelling if they have no idea what they are doing.

Leave it stock, or get it set up on a dyno. Anything else and you'll just make it worse.

[JackButler]

[stinkwheel]

[martin734]

[Easy-X]

And, pray tell, is the model of motorbike being discussed here?
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[JackButler]

[Kawasaki Jimbo]

[Easy-X]

I'm starting to wonder if there's a real bike in this story or whether this is just a vehicle to punt out some bollox
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[stinkwheel]

I'd be surprised of anyone could balance carbs more accurately by ear than by using a manometer.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.