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1989 yamaha banshee no start

Atv ran good before top-end rebuild, now it has fuel o carb bowls, spark, clean carbs, no clogged ports, new plugs, all hoses, tubes, and wires correct but it wont run. Could i have put the the reed cages upside-down?

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No you cant put them in upsidedown if they are not indexed to fit one way then you can run them either way.we need to consider a few things first spark if we have spark havve we checked the flywheel to make sure the key is not sheared and it is tight. next compression i assume since we did a top end compression is good but what about crank seals if they have never been done and are leaking transmission oil will get on ththe plugs and foul them. next fuel if gas is in the float bowls is it getting though the jets take the air filter off and spray starting fluid in the carb throat kick it if it fires for a second the carb jets need to be cleaned all that is left is air and i know you have that covered i hope this helps these 4 things are what make engines run so if you get all 4 its gonna run good luck dirt bike dan

Posted on Apr 18, 2013


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Posted on Jan 02, 2017

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SOURCE: banshee wont rev

Usually related to TORS, specifically the safety switch in the clutch/park brake assembly. If it's defective the engine won't rev. Solution: look for a TORS removal kit.

Posted on Aug 21, 2009

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I have a 2004 banshee at the yamaha dealer being worked on.It would not run when i took it up there they cleaned the carbs and put it back together it will start but when you rev it, it holds itself wide open and wont shut down unless you pull the plug wires.they also checked the floats in the carbs said they where ok. they think it is a vent issue with the gas tank or the fuel shut off valve.IS THAT POSSIBLE

Posted on Aug 27, 2009

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SOURCE: banshee running wide open after a couple of revs

The problem with vents is that a vent can get plugged and lessen or completely kill the flow of fuel. They will not make an engine rev wildly. Your banshee has standard carbs. The throttle cables may be routed incorrectly, pinching or stretching the cables. Remove the air filters. Look inside the carbs. Do the slides move freely up and down when the throttle is twisted? In the diagram below note the junction tube on the throttle cabel. The cable can stick at inside the tube. Is the connector hose between the carbs in place? Also, there is a switch on top of the carb. This can go haywire also. Odd that the problem was not present before they cleaned the carbs.
Can I get a “very helpful” rating on this answer?

Posted on Aug 27, 2009

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SOURCE: Yamaha banshee. Just rebuilt top

Check the plug color to see if it is normal. I would put new spark plug caps and new spark plugs on the machine and see if that helps . From what you describe , if the spark plug caps do not work , you will probably have to either , adjust your air screw setting or change your pilot jets up one size to compensate for the other changes.

Posted on Aug 17, 2010

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When was the last time new crank bearings and seals were installed? With all the work you have done on the carb I think the problem is the crank seals. But, check the bearings. At rest, the flywheel must be rock solid > no movement up or down, left or right.

If the bearings are solid then only replace the seals. Chances are the engine can stay in the frame if only the seals are being replaced. Best part is that seals are a low cost item.

One other possibility is a partially blocked exhaust system. Check the exhaust first. Checking the exhaust doesn't cost anything. Disconnect the exhaust pipes from the motor. Excite the neighbors by a quick ride down the street with no muffler. If the problem is instantly fixed then get a new exhaust.

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