Choke tube

[bigblock]

I bought my banshee at the end of the season last year and drove it around for a couple weekends, I figured it ran pretty good kept up with my buddy's 400ex, but i have never driven another banshee before so i don't have anything to compare it too.

 

I took the banshee out last week and I got my clymers manual and i was looking through it and noticed a tube that ran in between the two carbs, The choke tube, my banshee did not have one on it when i got it, so i don't know how long it ran without it. I researched this up and found this,

 

Q#31:What’s the choke tube and what does it do?

A#31:The choke tube is a small hose that sits between the two carbs, on the opposite side of the choke knob on the left carb to the left side of the right carb. The tube allows fuel drawn from the choke circuit on the left carb to richen both carbs when the choke is “on”. If the choke tube is removed and the motor run, it will run like crap, if at all.

 

I then bought some gas line and installed it where the choke tube goes, and my banshee has a little bit more bottom end, and idles a little better but that's about it. I thought putting the tube back in was going to make a big difference because apparently its barely suppose to run without it. So am i missing something here or am i just worrying for nothing.

[Larry's Shee]

Next thing to do is list your carb settings/jets. Would suggest cleaning carbs, setting float level, and syncing them. Clean air filter. What fuel/oil ratio are you running? What do your plugs look like? Have good blue spark? Also list any other mods not in your sig.

[bluebanshee98]

Next thing to do is list your carb settings/jets. Would suggest cleaning carbs, setting float level, and syncing them. Clean air filter. What fuel/oil ratio are you running? What do your plugs look like? Have good blue spark? Also list any other mods not in your sig.

x2. also what kind of carbs stock? stock air box? lid on or off? pods? elevation and temp riding in. i remember i forgot to put the damn tube back in and it usually always started in the summer but the colder it got the harder it would be to start . put tube back in, boom 2nd-4th kick no problem. sometimes it the stupid lil things we forget to do it prob wont effect it too much when riding but it will become very cold blooded without the tube when starting on a dead cold engine in the colder weather. i dont like the fact of having a open hole in the carb when riding either as things can get in there. i dont even like the overflow on the carbs without the tubes on them. yes im anal about my bike

[06specialedition]

I can't even get my bike to run without the choke tube. I'm surprised you could ride yours without.

Edited April 16, 2012 by 06specialedition

[HolySheet]

I can't even get my bike to run without the choke tube. I'm surprised you could ride yours without.

 

 

I've been running mine without the choke tube as well. I am going to put it in today to see if that's my starting issue.

[bigblock]

Alright thanks guys, I took the carbs apart and cleaned them, there was 320 main jets in there, I have a stock airbox with a k&n filter inside, and tors removal kit, and I was told by the previous owner too run 32:1 amsoil dominator.

 

I put them back together and now she runs better it actual idles great now, im just waiting on my uni pods to come in , ill probably have to bump up the main jets a couple sizes.

[ticktock]

320 jets? What is your altitude? Sounds like that's really fat to me

[Strm Trpr]

320 jets? What is your altitude? Sounds like that's really fat to me

I second that.

Toomey T5's with stock carbs and the Toomey 1 into 2 Uni Filter Intake calls for 280 mains at sea level and 270 mains after 2000ft and 260 mains after 4000ft.

What's your altitude and average temperature?

What pilot jet and needles are in the carbs?

[007banshee]

Alright thanks guys, I took the carbs apart and cleaned them, there was 320 main jets in there, I have a stock airbox with a k&n filter inside, and tors removal kit, and I was told by the previous owner too run 32:1 amsoil dominator.

 

I put them back together and now she runs better it actual idles great now, im just waiting on my uni pods to come in , ill probably have to bump up the main jets a couple sizes.

I have uni pods, fmf fatties pc2s, stock carbs, +4 timing at 900ft with 27.5 pilots, one clip below middle and its about 40-50 degrees in michigan. I started with 300 mains and WOT plug chop showed pretty lean so im at 320 now and haven't done a second chop, i will this weekend. Leakdown was good and 125 on both for compression. Hope this helps?

[Strm Trpr]

You're leaving power on the table with the rich jetting and your pre-mix is way to rich for that oil.

 

This means you have less fuel parts per million and you have to jet fat to try and make it up.

 

Click ---> http://www.amsoil.com/storefront/tdr.aspx scroll down to "Applications", second paragraph.

 

Says, "In pre-mix applications, DOMINATOR delivers outstanding protection at 50:1 pre-mix ratios (2.6 oz. oil per U.S. gallon of gas).

 

That will give you more Fuel parts per million and you won't have to Jet so Fat.

 

I recommend draining all of your fuel and mixing a fresh batch at 50:1, which is 13oz to 5 gallons of premium pump gas.

 

Leave your jetting as it is right now, (27.5 pilots, 320 mains and needle clip in 2nd groove from pointy end).

 

Go do a perfect plug chop with a fresh set of B8ES' gapped to .028" and report back.

 

http://www.dfn.com/agservices/plugchop.html

 

I bet it's rich as all get out now.

[AKheathen]

before handing out high potential advise, it is needed to check what is going on.......

as for the 320's, that does sound pretty close to what pc's sometimes need.

for the oil, look for signs of over-oiling before dropping on the mixture. the best way to see, is to pull the reeds, they are the first to show over-wetting in a more obvious way, but you can go off reading the plugs, and acting symptoms. it may start dropping off at idle and over-smoke, shown with loading the plugs (which may glaze on hard pulls)

 

the problem with the choke tube, is many noobs will accept it being finiky to start, or even pull-starting, never using the choke, chopy/rough idle/low-end drivability/power, etc to just get out and feel that snap of 2-stroke power. where it is a major problem, is that the right carb has an open hole right into the engine, and the left, if the choke is open. this means, at higher rpms, where you are making power from at least one cyl, at least one is lean as hell, which can aslo make a ton of power, as it melts the piston simultaneously....

[banshee jump]

You're leaving power on the table with the rich jetting and your pre-mix is way to rich for that oil.

 

This means you have less fuel parts per million and you have to jet fat to try and make it up.

 

Click ---> http://www.amsoil.co...efront/tdr.aspx scroll down to "Applications", second paragraph.

 

Says, "In pre-mix applications, DOMINATOR delivers outstanding protection at 50:1 pre-mix ratios (2.6 oz. oil per U.S. gallon of gas).

 

That will give you more Fuel parts per million and you won't have to Jet so Fat.

 

I recommend draining all of your fuel and mixing a fresh batch at 50:1, which is 13oz to 5 gallons of premium pump gas.

 

Leave your jetting as it is right now, (27.5 pilots, 320 mains and needle clip in 2nd groove from pointy end).

 

Go do a perfect plug chop with a fresh set of B8ES' gapped to .028" and report back.

 

http://www.dfn.com/a...s/plugchop.html

 

I bet it's rich as all get out now.

 

Perfect worked fine for me

[bigblock]

Alright thanks for all the advice guys, Akheathen hit it right on the head, i was having so much fun with all the top end that i didn't care much for the fact that the bike wouldn't idle worth shit or was bogging. Sadly it started snowing again up here so now i gotta wait until it melts all again to take the banshee out, but when i do, a plug chop with the instructions Strm Trpr gave me will be the first thing ill do.

[Strm Trpr]

Alright thanks for all the advice guys, Akheathen hit it right on the head, i was having so much fun with all the top end that i didn't care much for the fact that the bike wouldn't idle worth shit or was bogging. Sadly it started snowing again up here so now i gotta wait until it melts all again to take the banshee out, but when i do, a plug chop with the instructions Strm Trpr gave me will be the first thing ill do.

Right on, I'll be watching your thread.

It'll be informative for all of us.