Yamaha ATV Forum

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-   Yamaha YFZ350 Banshee (1987-Present) (https://www.bluetraxx.com/forums/yamaha-yfz350-banshee-1987-present/)
-   -   Cracked piston bridges (https://www.bluetraxx.com/forums/yamaha-yfz350-banshee-1987-present/93748-cracked-piston-bridges.html)

Bikez 08-23-2018 09:40 PM

I'm having problem with cracked intake bridges in a 4 mill short rod crank weisco pistons from driveline I've ran different squishes from 55 to 42 timing a +4 running 110 compression around 150

diggerzmound 08-24-2018 04:56 PM

I would double check the crank bearings.

fastbansheekid 08-27-2018 10:55 AM

Have you talked to driveline? Who is setting up the motor?

Bikez 08-27-2018 08:00 PM

Yeah I talked with driveline. He says detonation.... I talked with my local sponsor he's telling me to ditch the short rod stroker and go with 115 rods...

fastbansheekid 08-28-2018 08:20 AM

you have pictures of the damaged pistons?

Bikez 09-08-2018 05:00 PM

Yes I have pictures but I sold the short rod crank and bought a hot rods long rod crank

Bikez 09-08-2018 05:05 PM

I'm putting back together my 4 Mill 421cub. I bought 20cc domes from modd quad . I usually get them from noss or driveline. I notice that there squish band is wider. And there shaped like deep cereal bowl inside.. I'm a little skeptical about using them . What do you guys suggest

Bikez 09-09-2018 09:19 PM

Dome delima
 
I'm putting back together my 4 Mill 421cub. I bought 20cc domes from modd quad . I usually get them from noss or driveline. I notice that there squish band is wider. And there shaped like deep cereal bowl inside.. I'm a little skeptical about using them . What do you guys suggest

diggerzmound 09-12-2018 09:39 AM

Send ModQuad a quick message or call them. If they are the right ones, id run them.


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