Air Fuel Gauge Recommendations

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Agent Buchwald
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Location: Brighton

Tue May 28, 2019 8:50 am

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I'm too old for roadside jetting guesswork so am going to buy an AFR gauge, anyone have any advice or recommendations above and beyond the one listed above? Cheers.

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Main scooter: SX200
Location: Landsberg, Germany

Fri May 31, 2019 6:46 am

I use the MTX from Innovate since some years, working fine: ... l_plus.php

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Main scooter: Li Avanti 225
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Fri May 31, 2019 7:32 am

Out of interest.........if you set up the carb' stationary will it be affected when it's moving ? By this i mean when your travelling along at say 60mph with side panels on will the air intake be the same as when stationary ?.....pretty much same as a dyno' i suppose ?

B-Race Tuning
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Thu Apr 02, 2020 7:02 pm

Agent Buchwald, The AEM afr gauge is very accurate, but is not terribly robust. I'd add that the Bosch sensors clog up with the two stroke oil on a fairly regular basis and start to give you false readings, and need replacing on a regular basis. Also you'll need a fairly consistent 5-10 Amp DC supply.
Once you've set up the carb, you are probably better removing it from the scoot. With welding the sensor boss on, and the cost of the set-up/ battery I'd suggest an hour on you local dyno for less than a third of the cost (JB Tuning?) And jetting generally won't change unless you change something.
Mick, although on a dyno the scooter is stationary, it is under load rather than just free revving in neutral. Dyno/ carb set-up should be done with panels on if using an open carb, as panel obstruction will alter airflow ergo jetting. Also, carburation/ jetting should also be checked in the over-rev range as leaning off can regularly be observed, (That rev range BEYOND peak HP [eek]) and personally I'd prefer the scooter "stationary" whilst doing that.
The AFR from Innovate 'looks' a bit more robust than the AEM but no experience of it, and same applies re power and sensors.

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