Popping?

[brendan_922]

Ok, this Saturday i was riding/testing out the shee, I could have swore i heard some quite® pop's (not sure if i was on or off the throttle) after doing some nice pulls 1-6(gear) a couple times. then it started to bogg quite a bit when i gave it some gas no  matter where i was in the rpm's Then i heard one super loud pop and shut it of as soon as i heard it. then about five minutes later i rode back to my house which was maybe 50 ft and it ran fine I dont think it was getting to hot as it usually starts to drip coolant onto the pipe when it gets hot. Any info on what might have caused this would be nice.

 

FMF fatty pipes, stock silencer, no snorkel, 260 jetts, sea level...

Edited December 19, 2013 by brendan_922

[5150banshee]

I've been told a few times it pops when she is lean.

 

 

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[WINDYCITYJOHN400]

Your flywheel spun.

 

Pull your side cover and check the keyway. Pretty sure the key went for a ride and now your flywheel is way off on the timing. Time to pull it and check the damage.

 

If your bike EVER drips coolant out the pipe…the head gasket/O-ring is blown and that don't fix it's self!

 

If your bike was crazy lean….than THAT could lead to detonation and popping. All causes of a blown head gasket. Bikes that are hot or running with cylinders full of water are going to be boggy too.

 

Sounds like you got a few issues in the mix. 

[brendan_922]

WINDYCITYJOHN- it only drips when it gets HOT under regular riding it never drips. (doesnt drip out of the pipes it drips ONTO the pipes).. what could cause the  flywheel to have become 'spun'? I KNOW im a newb

Edited December 19, 2013 by brendan_922

[WINDYCITYJOHN400]

When your motor is accelerating, the crank is spinning and the flywheel is gaining speed with the crank. This is generally a smooth increase in speed so the flywheel doesn't get much stress as far as wanting to spin free from it's connection to the crank. But when you get off the gas at a high speed, if you don't pull the clutch in, the motor "Backloads" or "Engine brakes". In that instance the crank in slowed very quickly from it's acceleration and the forces on the flywheel are reversed. (Picture an item in the bed of a pick-up truck with stick shift. Under acceleration it's against the bed, lift off the gas and it wants to roll to the front)

 

This happens with the flywheel and it's quite common for the flywheel to roll on the crank. This shears to key in the keyway and allows the timing to be moved wildly off of it's normal settings.

 

On a side note…..if your bike is dripping out the overflow when it gets hot under normal riding, your jetting is too lean or your timing is too advanced. Banshees don't have cooling issues…..Banshee owners just have a history of jetting issues. LOL

[brendan_922]

thanks for the info. its dripped out the overflow when it was bone stock doing a long stupid burnout... other than that it hasn't.  

[WINDYCITYJOHN400]

thanks for the info. its dripped out the overflow when it was bone stock doing a long stupid burnout... other than that it hasn't.  

 

Ok….well that's stupid. Don't do that any more and you'll be fine. 

[Larry's Shee]

Ever do a plug chop/read? (properly?)

 

If flywheel has slipped, lap the wheel to the crank.