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SabreJim
Guest
tfb I sure appreciate your thread it has been helpful to me thank you all so much.
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Tarbash 27
Guest
I found this on google. It says how to tune the pilot fuel screw on a 4 stroke dirtbike. Could this be a good reference to tune my vm26's?
http://www.thumperfaq.com/fuel_screw.htm
start at question 11
http://www.thumperfaq.com/fuel_screw.htm
start at question 11
I didn't read everything, just a bit here and there. He says 4 strokes don't have an air screw but then contradicts himself later.
He says to set the pilot fuel screws at 1800 rpm's, but why would you set them at that rpm? If you want to adjust the pilot circuit, you adjust it at the factory recommended idle rpm, which will guarantee no overlap effect from the next jetting circuit, the cut-away, and to a lesser degree, the jet needle, which has an earlier effect than many believe. Also, it's much easier to hear the rpm's max out if you use the factory idle rpm as your base. The air screws, on carbs that have them, are adjusted at factory idle rpm and I see no reason why you'd use a higher rpm base to adjust the pilot fuel screws. Same goes for the mixture screws on our CV carbs.
I've posted several times how to adjust the pilot fuel screws and side air screws on your VM carbs. But you're free to believe who you want to believe. His advice doesn't specifically mention VM carbs. His advice is based on a very different engine.