Gas tester - air fuel ratio checker?

[cb1rocket]

As above is there a kit you can buy that you can whack into the exhaust pipe, like mot tester used? Need to see what fuel ratio I'm getting
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852

[Robby]

I think gunson used to do one. Not particularly cheap or effective, and can only be used to make adjustments at idle. Gun colourtune (basically a glass spark plug) would be more effective to set the mix at idle.

If you want to know what it's doing under load, you'll need to take it to a dyno.

[misscrabstick]

If you look on ebay you can often find old ones, trouble is with these they are a bif of a faff, calibration needs to be carried out, filters changed etc such as

https://www.ebay.co.uk/itm/Gunsons-GASTESTER-Mk2-CO-meter-exhaust-gas-analyser-for-classic-car-MoT-test-/111178553786?pt=UK_Diagnostic_Tools_Equipment&hash=item19e2c219ba


Thing is though other than idle checks, they are pretty useless for checking the mixture at higher rpm's unless you are using a dyno as well to load up the engine. no load readings are not accurate.

[Fizzer Thou]

HM Racing use a four gas analyser for checking exhaust emissions

https://www.hmracing.co.uk/index.php/hmr-dyno-engine-suspension-servicing/motorcycle-dyno-hm-racing

Their latest rolling road also comes with a Lambda tester,which is similar to the air/fuel ratio (AFR) which is a calculation of CO (carbon monoxide),CO2 (carbon dioxide),HC (hydrocarbon or unburnt fuel) and O2 (oxygen).On the SUN gas analyser at HM Racing they can switch between Lambda and AFR,but they also have a function for corrected CO,which shows up a leak in the exhaust or inlet manifolds.The differance between CO and CO Corrected shows up as a leak somewhere,which is useful as a diagnostic tool.
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Just talk bikes.What else is there?

Always have a 'Plan B'

[_Iain_]

If this is for the H100 then keep in mind a specific type of probe is required for testing due to the oil in the exhaust.
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Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[stu_m]

you can get a sensor that bolts in to the exhaust (drill hole and weld a nut on) and a gauge that mounts on the dash which will give you your A/F as your riding along

you can also get them where they read the RPM too and you can log it too so you can look back for each RPM

the only trouble is they aren't cheap

£180 for basic stuff

for something that will log etc your talking 3-400 quid

[sickpup]

[cb1rocket]

Ok thanks guys looks like I'm stuck with plug chopping
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Honda H100S2 Rebuild - https://www.bikechatforums.com/viewtopic.php?t=253852