This is a discussion on banshee won't run within the Yamaha YFZ350 Banshee (1987-Present) forums, part of the Performance /Technical category; i have a 2000 banshee 350 that i bought last year and i ran good for a few months. I'm new to the 2 stroke ...
i have a 2000 banshee 350 that i bought last year and i ran good for a few months. I'm new to the 2 stroke world and apparently i had been mixing the oil and gas to lean. the crank bearing came apart and wouldn't run. I tore the motor down and put a new crank, seals,pistons,everything. It still wouldn't run. Put a new coil and new plugs in it. New kits for the carbs. New throttle cable. New fuel shutoff. The carbs appear the be in sync but it still won't run. The only way u can start it is to spray gas in the back of the carbs. It will start but runs like shit. Sometimes misses on the right side. It is getting gas to the carbs but it will not start on it's own. I have found a tiny split on the inside of the manifold boots but i think its from the ridge on the top of the carbs from pulling them on and off. I don't know what else to do. Any help would greatly be appreciated.
Check your reeds. even though you put a new jet kit in it doesnt mean its jetted properly. Also if you have the tors system on it buy the tors removal kit. these tend to cause issues like your having.
__________________ You are only as fast as your bike/wife will allow you to be 2000 powdercoated blue shee 68mm pistons/396cc trued/welded crank hinson clutch kit cut domes 35mm airstrikers +8 swinger complete Finally
i have pulled the reeds and they seem to be fine. one guy even told me that if they weren't completely flat that i could pull the reeds off and flip them over. they are flat. theres no tears or rips or anything. and the kits i put in the carbs would be stock. but its not a stock motor anymore. its a 358. so do i need to rejet? it ran great before the blowup/ rebuild. just don't know. and the tors system is a piece of shit. its still on the bike but its not plugged in. if you plug it up then you don't get any spark. if u unplug it you get great spark. i know the tors removal kit isn't that much but how big of a pain in the ass is it to install?
Last edited by banshee000; 08-27-2009 at 10:39 AM.
You say gas is reaching the carbs, but will only start when fuel is sprayed into the back side...... I would try checking the float height. Stolen from the Toomey web site
Now you must verify the float level setting, as they are frequently out of adjustment and any bouncing around that the bike does just makes them go off more. They should really be checked at least every 3 months or sooner. If you are racing, set them before every race, when you do your normal pre-race maintenance.
Hold the carb with the throttle bore vertical and the float hinge at the top so that the floats can swing freely. Swing the floats with your finger to verify they are free and operating properly. Now, just rotate the carb towards the upside-down position only until the floats just sit down on the float needle valve. Any more rotation will cause the weight of the floats to push down on the spring loaded float needle valve and you will get an erroneous reading. The proper angle is about a 45 degree angle from vertical.
At this point with either a metric measuring scale or the tail end of a pair of calipers (or other such accurate measuring device) measure the distance from the float bowl gasket surface -- WITHOUT THE GASKET-- to the top of the float itself. This measurement should be 21mm exactly on both floats. If you get some other reading just bend or tweak the float arms until you get this setting. Just don't bend them sideways so that they may interfere with the float bowl itself. Check for clearance when you are finished. When you are satisfied they are perfect, replace the float bowl gasket and float bowl.
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the kit is extremely easy to install. you run the throttle cable through the new caps and through the spring thats with the caps and on to your slide. then run your slide in the carb and screw on. sounds like you already have the tors disconnected so just got to yank it out.
as far as the jetting goes you will need to rejet it. are you running pipes and an aftermarket filter?
__________________ You are only as fast as your bike/wife will allow you to be 2000 powdercoated blue shee 68mm pistons/396cc trued/welded crank hinson clutch kit cut domes 35mm airstrikers +8 swinger complete Finally
yeah i have a set of pro circuit platinum pipes and 304 silencers and an aftermarket air filter with a prefilter. don't know what kind tho. and the air box lid is off.
most likely jetting. get it rejetted for the pipes and filter and it might fix your problem. if it doesnt fix it 100% im sure if needed it anyways.
__________________ You are only as fast as your bike/wife will allow you to be 2000 powdercoated blue shee 68mm pistons/396cc trued/welded crank hinson clutch kit cut domes 35mm airstrikers +8 swinger complete Finally
what jetting would you recommend? like i said before i'm new to the 2 stroke world and don't know a whole lot. any help or information you could give me would be appreciated.
__________________ You are only as fast as your bike/wife will allow you to be 2000 powdercoated blue shee 68mm pistons/396cc trued/welded crank hinson clutch kit cut domes 35mm airstrikers +8 swinger complete Finally
my elevation is around 1000 to 1500 ft. above sea level. and i just ordered a tors elimination kit so hopefully i'll have it next week. so can anyone tell me what kind of jetting i need or will need when i remove the tors.???
Last edited by banshee000; 10-15-2009 at 11:27 PM.
well i got the tors removal kit finally and put it on and nothing. It's still doing the same thing. Guess i'm just gonna have to shell out some dollars and take it to the local yamaha shop.
hey. i got my banshee goin again. took it to the shop and it was the vent hose between the carbs was missing and the jets were too small. open airbox. so they put 280's in it. ran great for about 3 weeks. but now i have a new problem. it starts and idles great but when u give it any gas it bogs down but doesn't die. when u let off the gas it goes back to idleing just fine. and i changed the plugs. any help would be great. don't have money to take it to the shop everytime.
Last edited by banshee000; 03-16-2010 at 08:27 PM.
hey. i got my banshee goin again. took it to the shop and it was the vent hose between the carbs was missing and the jets were too small. open airbox. so they put 280's in it. ran great for about 3 weeks. but now i have a new problem. it starts and idles great but when u give it any gas it bogs down but doesn't die. when u let off the gas it goes back to idleing just fine. and i changed the plugs. any help would be great. don't have money to take it to the shop everytime.
There is a good chance your main jets are plugged.
really??? cuz i bought a clymer repair manual and it said 20:1... or 24:1 with castrol. and break in was 16:1. so will running that much oil mess anything up???
Last edited by banshee000; 03-19-2010 at 01:42 PM.
banshee won't run
08' yfz 450 Velocity intake,k&n filter, DMC Afterburner silencer, ceramic coated head pipe,9 paddle haulers.cascade gas cap,
Linear Mode
