WHAT SNOWMOBILE IS THIS MOTOR FROM? need jets and air filter
Posted 20 June 2011 - 11:35 PM
i need an air filter for it, and i think i need to change the jets. anybody know where to get that stuff?
Posted 21 June 2011 - 12:29 PM
Posted 21 June 2011 - 12:40 PM
Posted 21 June 2011 - 06:53 PM
When jetting keep in mind it was jetted to run at below zero temps,so its going to take some work to get it close,i usually go up 1 or 2 main jet size when i remove a yamaha air box and put uni filters on it,or leave the stock jets if i dont change any thing else,but do wide open under load/kill it plug reading to check it.yamahas are usually jetted fat from the factory,and i rarely ride when it's that cold.
I usually go up or down a jet size for every 10 degrees of temp change to start with and read plugs if i dont have a egt gauge on it (highly recomended)
So if you figure out the factory jetting in your climate is good for below zero,and you are going to use it in the summer,figure an average temp,say 60 you would start by going down 6 sizes and then add 1 or 2 because you need a uni filter which will lean it out.
Be carefull always jet fat first,plugs are cheap,pistons are not.
Posted 21 June 2011 - 10:41 PM
Anybody know if these carbs have tuning screws? (I wont see it till Friday)
Posted 23 June 2011 - 09:48 AM
Posted 23 June 2011 - 01:20 PM
im goin to the lake 2night so ill be able to check it out
Posted 23 June 2011 - 01:44 PM
Try Denis Kirk...should have what you need, or when you get the motor, pull a jet and measure its length and your local shop should be able to scource them.
Posted 24 June 2011 - 06:48 AM
Posted 25 June 2011 - 11:16 PM
stock pilot jet is 45 and main jet is 151.3.
and the motor had in it a 30 pilot and 151.3 main.
the dealer told me i should get the stock pilot jet and a 155 and/or 160 main jet.
i didnt order them yet though till i found out what you guys thought.
Posted 27 June 2011 - 06:21 AM
And this is one of the best, in depth carb tuning handbooks out there and is always good to have around the shop:
Posted 01 July 2011 - 09:32 AM
Posted 28 July 2011 - 10:18 PM
Posted 13 December 2011 - 02:49 PM