Mac
Member
How far can fuel screws be turned out. I read here on TY about 3 turns out max. I'm at 2 3/4 now. I have a 780 Big Bore running number 50 pilots accross and the idle is hanging just a bit. Flip the choke and it idles right down. If I go to 52.5 straight accross where do I reset the fuel screws for a starting point. Thanks guys.
pilot screws
On my 780 with stock carbs I am using 45 pilots. My 35mm bored carbs are 47.5 and they are at each 2 to 2 1/4 turns. They idle and are very responsive set up this way. I don't know why you would need 50 or anything bigger. Just my opion , but who knows.
On my 780 with stock carbs I am using 45 pilots. My 35mm bored carbs are 47.5 and they are at each 2 to 2 1/4 turns. They idle and are very responsive set up this way. I don't know why you would need 50 or anything bigger. Just my opion , but who knows.
redsnake3
New member
the bored carbs flow more so need smaller jets to flow the same as a smaller carb. i think this is right. i know i read it somewhere.
I would throw in 52.5 pilots and set the screws at 1.50-1.75 turns out.
I have a healthy 780 srx here with bored carbs I just did for a ty member and I am using 55 pilots, 1.5 turns out on screws with needles on #4, and 160 main jets, its about spot on. They like fuel, dont be afraid to give it fuel.
My personal rule of thumb is if your at 2 turns or more out to get it to run right, you need the next size up in pilot jet. If you turn them out past this you wont have alot of spring tension on the needle screw and it can fall out, will be plenty lean then.......
I have a healthy 780 srx here with bored carbs I just did for a ty member and I am using 55 pilots, 1.5 turns out on screws with needles on #4, and 160 main jets, its about spot on. They like fuel, dont be afraid to give it fuel.
My personal rule of thumb is if your at 2 turns or more out to get it to run right, you need the next size up in pilot jet. If you turn them out past this you wont have alot of spring tension on the needle screw and it can fall out, will be plenty lean then.......
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Mac
Member
Fuel Screws
I'm running the 35mm bored carbs as well. Also running a gutted air box with a couple of 1 1/2 holes in the top of the box. NYsrx your running a SRX so that explains why your jetting is so lean. A Viper with advanced timing and CPR pipes will not use a 47.5 pilot. I'm sure I need more fuel. MrViper will be along soon.
I'm running the 35mm bored carbs as well. Also running a gutted air box with a couple of 1 1/2 holes in the top of the box. NYsrx your running a SRX so that explains why your jetting is so lean. A Viper with advanced timing and CPR pipes will not use a 47.5 pilot. I'm sure I need more fuel. MrViper will be along soon.