couple questions

[dogger]

last year I bought a mostly stock banshee from a buddy but it needed some work but the price was stock. this is my first banshee but no my first two stroke.

I did a compression test on the bike and came up with 135 psi per cyclinder. the bike is hard to start and what I'm wanting to know is it time to do a top end on this motor or should the compression be good yet.

 

also I have a couple pwk34mm laying around from my 250r's that I'd like to swap onto the bike with toomey's. what all will be needed to make these work. I know I'll need a throttle cable but do I need to swap the intake boot or can I make it work with some fighting? also I'm curios if anyone has ball park jetting info to get the jets close when I stick them on. I can get it tuned right myself just hoping somebody can give some jet's to start from.

 

the bike does have delta force reeds already. they are brand new. beside that and the toomey's and carbs are there any other mods you'd recommend while the bikes apart that would give some good power increases.

 

thanks' for the help. I've been riding and modding 250r's for years now but this is my first banshee and I curious to see what I can do with it. once it's running right though the suspension is the first thing I want to addresse as I really dislike the handling of the bike. some new aarms and shocks should really help the bike out.

[Snopczynski]

last year I bought a mostly stock banshee from a buddy but it needed some work but the price was stock. this is my first banshee but no my first two stroke.

I did a compression test on the bike and came up with 135 psi per cyclinder. the bike is hard to start and what I'm wanting to know is it time to do a top end on this motor or should the compression be good yet.

 

also I have a couple pwk34mm laying around from my 250r's that I'd like to swap onto the bike with toomey's. what all will be needed to make these work. I know I'll need a throttle cable but do I need to swap the intake boot or can I make it work with some fighting? also I'm curios if anyone has ball park jetting info to get the jets close when I stick them on. I can get it tuned right myself just hoping somebody can give some jet's to start from.

 

the bike does have delta force reeds already. they are brand new. beside that and the toomey's and carbs are there any other mods you'd recommend while the bikes apart that would give some good power increases.

 

thanks' for the help. I've been riding and modding 250r's for years now but this is my first banshee and I curious to see what I can do with it. once it's running right though the suspension is the first thing I want to addresse as I really dislike the handling of the bike. some new aarms and shocks should really help the bike out.

 

135 psi on a stock motor is good still. They dont make a 34mm pwk carburetor. If its a 34mm carb, its a pj.

 

[2004LEBanshee]

Ill try and help you out.

Your compression sounds good but it depends what your elevation is and if the head was worked on. Strock is around 120 each, yours is higher so your either close or below sea level, have a good top end, or the head was milled (assuming a stock head). If it was just done about .030 over your compression is probably fine. As for the jetting its hard to tell because I dont know what the temp is outside there and I dont know what your elevation is again. I would think the hard starting is due to bad spark or (bad jetting probably this), should be plenty of compression for it to start easy.

As for the carbs if its a stock or just piped motor I would leave the stock ones on. I prefer them for a lightly modded motor. But it depends on where you ride. (trails Dunes). As for a guess on starting possition of jetting ( now I dont know your temp, elevation,or intake Im assuming air box since you mentioned something about it, Ill try and get you rich to start and you can work from there)

 

340's main 27.5 pilot (probably 25 2 1/2 turns out will be better) needle Maybe 4th from bottom, Middle will have you running ok but it may like 4th better youll have to try and see. Im going to assume your mains will need to be dropped one or two sizes two. But better rich then lean to start.

[AKheathen]

340's main 27.5 pilot (probably 25 2 1/2 turns out will be better) needle Maybe 4th from bottom, Middle will have you running ok but it may like 4th better youll have to try and see. Im going to assume your mains will need to be dropped one or two sizes two. But better rich then lean to start.

25& 2.5 turns? sounds like you need a thicker needle

[donkeypuncher]

i would suggest an adjustable timing plate and either a cool head or milled stock head. also, as stated i wouldn't throw bigger carbs on your bike 'till you atleast get some portwork.

 

 

edit: welcome to BHQ. :beer:

[2004LEBanshee]

25& 2.5 turns? sounds like you need a thicker needle

 

I might be mistaken. When I had a close to stock setup I had a stock pilot with the air screws turned about 2- 2.5 turns out. I think stock is 25 but maybe 27.5. What ever stock is. I was 1000ft and around 60 F.