MarkShapiro

My Feedback: (52)

I have a 3W-140 inline twin. Discontinued engine but it has never seen fuel. It also has two walbro carbs. Question: how the heck do I tune the fuel/air mix? Manual says to start initially with one turn open on high and low needle settings, but how can I know if each carb is properly mixed/adjusted after that? Any advise and tips are appreciated.

wingspar

My Feedback: (3)

My suggestion would be to use a infrared meter. Fluke makes the one I use. Adjust the needles so that both cylinders are within 20 degrees of each other. Make the rear cylinder the cooler of the two as it doesn't get as much airflow.

http://www.testequipmentdepot.com/fl...FUFyQgodsi0AmA
Hobbyking sells some sort of infrared meter too.

Dave

MarkShapiro

My Feedback: (52)

Much appreciated. Thanks Dave. I have a temp meter already, so I am all set with that. I'll try again tomorrow.

hrrcflyer

Hey Mark,

Getting in touch with Gerhard at Aircraft International wouldn't be a bad place to ask ANY questions you have with regards to 3W engines.

Take care,
David