94 banshee Electrical box concern

[Weston_]

94 banshee, bored out to 392, lots of other mods, we are still working on this thing, weve bought new carbs, no air leaks, everything clean, fresh packing in pipes, no exhaust leaks, weve swaped jets over a 1000 times and still cant get that toprange power, it wants to pin out and start poping and crackling, n its not through carbs,its through exhaust. It a banshee that thing should snap your neck when u hit the gas, but weve done everythng and it just wants to pin out super quick  in every gear, and start poping, its got great compression, 160, psi on 6 kicks . we think it migh be the elecricalbox, because somethings killing that top range power, i dont know a lot about electrical, and do i need to buy a sport electrical-box, i need some  answers  

[SKEETER]

What's the trick to boring a stock cyl to 392cc?

[Weston_]

I can answer other questions later, where going to Sahara on  new years, so i need to know what the problem is if anyone can help me out  

[Weston_]

@BOOBS , u can by 392 big bore kits 

[monster]

Try swapping the ignition coil. 

[Weston_]

What do think  about the CVI box, this things super hoped up so what about a aftermarket CVI box, could that be why its not wanting to give that full power and why its killing the power on the engine. 

[hoppedupandcutdown]

probably Spark plug caps, maybe reeds. Swap a known good CDI to test, don't waste money on a A/M CDI. Are your new carbs Chinese by chance?

[monster]

Sorry I didn’t explain why  the coil is where I’d start . Had my sons banshee runs great until high rpm sputters missing poping like bad jetting.  After half a day of tinkering. Swap good coil from other banshee runs great. The coil was breaking down under high rpm and load.  It’s just 2 10mm bolts and a plug. I have a 10 mil serval and I’m running all OEM ignition.  

 

Have a Merry Christmas

[Weston_]

What brand coil should i look for ? 

[monster]

Yamaha or get a used one. Swap one from a friend to diagnose. 

[SKEETER]

Super hopped up . LOL'Z

[Weston_]

They  have lots of brands, thats what im asking i dont want a little cheapy

[ATV_hub]

Don’t go out and buy a new coil just yet, test your electronics first, the coil may not be the issue

[locogato11283]

I have found several times that if a Banshee starts and idles fine, but runs like shit at WOT, the CDI is bad.

I've had this happen several times.