80 special jetting question

[Bauer]

Hey all,
Is it true that certain jets (pilot, main) adjust certain rpms? ie. pilot adjust 0-4000?

Im looking at rejetting the 3rd degree, its sluggish at low to mid RPMS and lean overall. So I know I need to do something, but after doing some searching, I came up with my question.

also, where is the link for the jet guide as to performance modifications, I was looking for that also, but drew a blank.

Im running a K&N filter w/ stock airbox (pods will be soon, so jets will need to reflect that) and baffled exhuast, w/ surgury having been done to make them not so quiet. I need to know the sizes to go up with each modification.


Thanks

[dragxs11]

Hey Bauer,
The pilot jets don't change, just make sure the're clean. Adjustment of those can be done with the screws on the tops of the carbs. The mains are the ones you change. Your settings will probably need significant changes when you put on cone filters. This is the only thing about carbs I can't explain. But they tend to make the bike run very rich. So be prepared to drop some jet sizes. Incidently, the pilots control idle and low end fuel. Though they still contribute all the way up, the mains pretty much take over more as the butterfly opens more. Dunno the link to the jetting guide, but the're more guidelines than anything.

[Glarusguy]

cones

Some cone filters work better than others. Some will make your mixture lean while others(less preferred) make it rich. At defined inner shoulder where the cones connect to the carbs will richen the mixture. Others just plain breath better. Search the "cone filters" here, and grab a snack while you read. Bottom line is know what cones you are buying. Keep reading the plugs. Check out "tech tips" at the left for the guidlines to jetting. I ended up raising the slide needle a clip for my setup. I do believe though that the 80 may need washers to do this. (?)
Hope this helps a little.

[Yamaniac]

clarus,

you are right about the washers. I have a set of 80g carbs apart right now. Although, when rebuilding an SF set of carbs, I bought a Keyster carb set off ebay... comes with new slide needle. I think the 80g sets may also, so if you rebuild and get the Keyster carb kits, you may not have to use washers, just put in the new needle.

[Bauer]

found the link for the jetting recommendations..

Linky


Its best suited for the 78-79 carbs. anybody have an update for the 80-82?

according to this, I need.

1 main size for exhaust
1 main size for K&N
1 main size for drilled air box
1 pilot (3 main increase)

Sound about right for those that have similar modifications?

Thanks