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Need some help guys. Can't get a fresh rebuilt motor started


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So I finally got everything together and tried to fire it up tonight. It is firing, but won't stay running and backfires a little bit.

 

Mods....

 

T5 pipes

Ported cylinders

Fresh top end

V force 4's

Boss intake

Cfm airbox

K&n filters

Cool head w/ 22cc domes

Stock carbs 27.5 pilots, 310 mains, stock needles, air screw 2 turns out

Dynatek Cdi ( I have spark) new br8es plugs

 

 

Here is what I have done before trying to start it.

 

Leak tested (passed)

Cleaned carbs in my sonic cleaner (spotless)

93 octane 32:1 with maxima oil

Turned in idle screw until I felt it touch the slide. Then went 1.75 more turns

 

 

I'm open to any and all suggestions. The bike does not have a key. When I was making sure it had spark I noticed the key wires were not connected. So I tied them together seeing if it still sparked and it did. The wires are now together. Could this be my problem?

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I had the wires backwards. I connected the key wires and it fired up first kick! It does seem to vibrate a lot though. I have never owned a banshee before so I don't know what to expect. When it's idling the brake lever is vibrating. These motors have counterbalances, right?

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New crank? Trued and welded?

Do you have the 2 dampers in? One in the left front and on in the right rear? I think. Might be opposite, but anyways they are on the bolts that go through the motor mounts.

You are correct...I always remember by thinking if you pulled back on the chain that is the direction the motor would twist.  They are between the frame and the motor on the two main motor mount bolts.

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Thanks for the pics sheerider. I will look and see if they are there. I have 27.5 pilots in there right now. My mods are in my first post. Think I might go back to stock, but I'll have to order them. The motor shakes around a good bit. It just sucks cause I have never owned a banshee or known anyone that has. I have a gopro and I'm going to try to make a video. I might just be paranoid.

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