Jetting Ballpark

[AllMotor347]

my bike is a 99 it has FMF Fattys with powercores, vitos superstock pistons with a new top end bored .040 over, right now the bike has 340 mains the needle clip set 1 slot leaner than the middle and the stock pilots, the bike will bog at low RPMs then hit real hard, any ideas on where my jetting should be at?

thanks

[reded]

Try richening the needle.

[ellison445]

340 sounds very rich What do your plugs look like? What filter setup are you running? Is the lid on or off, and what is your elevation? You give us that info and we will get you in the right direction in no time

[AllMotor347]

when i pull my plus they look lean (white), I am running a foam filter with the lid removed, I am in mass, so my elevation is relativly low, also I was runnign a larger pilot (27.5) and it ran worse with the larger pilot so I switched back to the stock ones (25) where it ran a little better

thanks for the help keep it comin

[ellison445]

What about reeds? I would inspect the reeds and intake boots. Sounds to me Like you might have a airleak someplace

 

when i pull my plus they look lean (white), I am running a foam filter with the lid removed, I am in mass, so my elevation is relativly low, also I was runnign a larger pilot (27.5) and it ran worse with the larger pilot so I switched back to the stock ones (25) where it ran a little better

thanks for the help keep it comin

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[bigboybanshee]

What about reeds? I would inspect the reeds and intake boots. Sounds to me Like you might have a airleak someplace

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[AllMotor347]

I checked out the reeds and the intake boots when i put a new topend in the bike two weeks ago everything seemed in good shape, the previous owner said the reeds where FMF's but he could just been talkin (does FMF even make reeds)

[ellison445]

FMF does make reeds so its possible , But I still think you have a airleak..Just looking at the boots is not enough to tell if you have one. Start the bike and spray all around the Intakes, reeds and boots. If you bike bogs down or starts racing there is your leak

 

I checked out the reeds and the intake boots when i put a new topend in the bike two weeks ago everything seemed in good shape, the previous owner said the reeds where FMF's but he could just been talkin (does FMF even make reeds)

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[AllMotor347]

what should I spray with? a carb cleaner of some sort, also any ideas on a good starting point for my jetting

[ellison445]

Yeap Carb cleaner I would leave the jetting alone until you find the leak

 

what should I spray with? a carb cleaner of some sort, also any ideas on a good starting point for my jetting

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[AllMotor347]

so when the bike if going at a slow speed or starting off it bogs, then it seems like once you hit a certain rpm some1 hits the thing with a sledge hammer and the bike rips but once the revs go down it bogs again, that sounds more like an air leak?

thanks for the help man if you ever around boston let me know

[AllMotor347]

one more thing, should i use the stock needles or the needles vito's sent me?