Cracked piston bridges - Yamaha ATV Forum
 
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post #1 of 9 Old 08-23-2018, 09:40 PM Thread Starter
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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

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post #2 of 9 Old 08-24-2018, 04:56 PM
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I would double check the crank bearings.

01' Raptor 720, Stage 2, FCR'd
97' 250 Vitos Blaster
06' Rhino 450
94' Banshee T-5's, Vforce, ported, Cool Head, 2-1
06' Wolverine 450 - Stock!
06' LTZ 440
94' Vmax4 750, 96' 600 MountainMax, 07' Nytro(b00sTed)
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post #3 of 9 Old 08-27-2018, 10:55 AM
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Have you talked to driveline? Who is setting up the motor?
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post #4 of 9 Old 08-27-2018, 08:00 PM Thread Starter
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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...
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post #5 of 9 Old 08-28-2018, 08:20 AM
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you have pictures of the damaged pistons?
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post #6 of 9 Old 09-08-2018, 05:00 PM Thread Starter
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Yes I have pictures but I sold the short rod crank and bought a hot rods long rod crank
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post #7 of 9 Old 09-08-2018, 05:05 PM Thread Starter
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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

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post #8 of 9 Old 09-09-2018, 09:19 PM Thread Starter
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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
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post #9 of 9 Old 09-12-2018, 09:39 AM
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Send ModQuad a quick message or call them. If they are the right ones, id run them.

01' Raptor 720, Stage 2, FCR'd
97' 250 Vitos Blaster
06' Rhino 450
94' Banshee T-5's, Vforce, ported, Cool Head, 2-1
06' Wolverine 450 - Stock!
06' LTZ 440
94' Vmax4 750, 96' 600 MountainMax, 07' Nytro(b00sTed)
06' Vmax 1200
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