Where would you guys start with jetting? Need some advice please. <3

[Velislide]

Hey all. Well heres the story, I'm building a banshee from the frame up with tons of random parts from ebay and such. Engines rebuilt with .050 over Wiseco prolites, ported cylinders, FMF Gold series exhaust w/ FMF silencers. For the air filter, I have the standard airbox with a K&N power lid. I plan on running no filter on the inside, and making sure the box is sealed up good.

 

What jetting should I start with? I have stock jets in the stock carbs. Also should I advance the timing??? Thanks!

 

Also, my elevation is 1150 feet! Thanks!

Edited October 26, 2009 by Velislide

[03bansheeman126]

why no air filter just do a proper plug chop and see what it says

[banshee#44]

you should run a filter and kick the box. get some K&N pods or somthin

[AKheathen]

depending on your porting and which fmf pipes, you will most likely be in the range of 300-350, and almost certain 27.5pilot. start with the 350 main and work yor way down if it sputters on the top. start with plug chops once it runs deccent on the topend wot. cold temps will require larger mains,as well

[scottzimmerman]

no filter get a pro-flow plate k/n filter no lid that's what i would do but that me

[Velislide]

no filter get a pro-flow plate k/n filter no lid that's what i would do but that me

 

Just curious, but whats the different between running a filter inside the box with no lid, and running a flat filter on top of the box, acting as the lid? Both filter everything coming into the box, and I already have the powerlid, lol.

 

This would work better then pods imo, less likely to get dirt and water spashed directly into the filter, like you would get with pods.

 

Edited October 27, 2009 by Velislide

[AKheathen]

hey man, go for it. i don't see the problem as long as you keep it sealed good.......just put an outterware on it or it will load up with tons of shit

[Velislide]

hey man, go for it. i don't see the problem as long as you keep it sealed good.......just put an outterware on it or it will load up with tons of shit

 

Yea I just gotta find a better way to get the outerwear on it, I dont trust that junky stick on velcro. Probably going to just use tiny little screws to hold the prefilter onto it. As far as the lid sealing, it has a slot in it that the airbox goes into, so its a super snug fit. Cars use flat filters like this, so I dont see any reason why this wont work as good as pod filters. This would be safer imo, and maybe even better flow? Also going to make a catch tube on the airbox drain, for water if it ever gets in there.

[scottzimmerman]

Yea I just gotta find a better way to get the outerwear on it, I dont trust that junky stick on velcro. Probably going to just use tiny little screws to hold the prefilter onto it. As far as the lid sealing, it has a slot in it that the airbox goes into, so its a super snug fit. Cars use flat filters like this, so I dont see any reason why this wont work as good as pod filters. This would be safer imo, and maybe even better flow? Also going to make a catch tube on the airbox drain, for water if it ever gets in there.

buddy ran his like that had a hell of a time with jetting and if its real dusty out he had to clean he outerwear every 20min i spray the inside of my box with my filter oil to help collect sum of the dust helps the outer were last a little longer on cleaning it just my 2 cents run what you got i know i hate spending money on shit lol

[Velislide]

buddy ran his like that had a hell of a time with jetting and if its real dusty out he had to clean he outerwear every 20min i spray the inside of my box with my filter oil to help collect sum of the dust helps the outer were last a little longer on cleaning it just my 2 cents run what you got i know i hate spending money on shit lol

 

I cant really see pods w/ outerwears getting any less dusty, being even more exposed without that airbox blocking things being thrown. I imagine cleaning will be as easy as taking an air hose and spraying dust off the top, shouldnt be too bad.

 

And why would it change the jetting? Maybe your friend didnt really know what he was doing? I cant see it being any different to jet then other filters. I dont have bamuch for experience jetting 2strokes, but I'm sure ill learn fast.

 

So back to the topic, 27.5 pilot, 350 main jet to start with? I think I have the 350 main jet already in a bag, what size pilots are stock in these?

[scottzimmerman]

I cant really see pods w/ outerwears getting any less dusty, being even more exposed without that airbox blocking things being thrown. I imagine cleaning will be as easy as taking an air hose and spraying dust off the top, shouldnt be too bad.

 

And why would it change the jetting? Maybe your friend didnt really know what he was doing? I cant see it being any different to jet then other filters. I dont have bamuch for experience jetting 2strokes, but I'm sure ill learn fast.

 

So back to the topic, 27.5 pilot, 350 main jet to start with? I think I have the 350 main jet already in a bag, what size pilots are stock in these?

mine stock carbs came with 25 pilot and 200 main i run a 27.5 and 300 with t5's +4 timing

[AKheathen]

I cant really see pods w/ outerwears getting any less dusty, being even more exposed without that airbox blocking things being thrown. I imagine cleaning will be as easy as taking an air hose and spraying dust off the top, shouldnt be too bad.

 

And why would it change the jetting? Maybe your friend didnt really know what he was doing? I cant see it being any different to jet then other filters. I dont have bamuch for experience jetting 2strokes, but I'm sure ill learn fast.

 

So back to the topic, 27.5 pilot, 350 main jet to start with? I think I have the 350 main jet already in a bag, what size pilots are stock in these?

no! no! no! NO!

 

don't ever use an airhose in a filter, exept fom the inside, with verry little force at a distance when knocking the stuff off. ither than that, it jamms all the debris in the gause perminently and can blow little holes in the gause. restriction in the fillter will richen your jetting up. you should be able to rip the outterware off and shake the dust if it gets clogged while ridding. just use the velcro, clean real good before sticking, and staple the velcro on...stock pilot is 25

[Velislide]

Meant to blow off the prefilter, lol. But thanks!

[Velislide]

So use 27.5 pilots, and start with 350 mains and work my way down? Sound about right? Any objections?

[dajogejr]

I wouldn't trust that lid on a stock air box any further than I could throw it.

If it were an aluminum box...sure.

 

My advice is get an outerwear cover, a pro flow kit and a single K&N filter. That box will warp and get shit in it...guarantee.

 

You don't need compressed air.

Just use the K&N Filter cleaner, let it soak for 20 - 30 minutes and rinse it off from the inside out with warm water.

 

Hell, I use K&N Filter cleaner to clean the outside of my carbs, sprocket area, hubs, etc.

It works awesome without a brush or sponge.

 

Without knowing your elevation, rider weight, riding temps or who ported your motor or it's specs, all we can do is guesstimate.

 

280 to 320 mains and MAYBE a 27.5 pilot. I would leave the stock pilots in (25) and turn the air screw out 1.0 turns.

If it won't idle or run well off the bottom, and you have to go another .5 turns in...then go 27.5 pilots.

 

190 to 210 are the stock main jets in stock carbs. 200 was stock from the factory but depending on the locale of your dealer, it could've been from 190 to 210. Unless you were in an extreme temp or altitude change, like Colorado or Alaska for example.