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Offline Dieselboy93

Cracked head a common issue?
« on: January 02, 2017, 02:30:51 PM »
So I just bought a 2014 zforce 800ex guy I got it from said it had a wiring issue and would lose spark on the front cylinder. So I traced wiring found nothing but both plugs were fuel fouled so I replaced them and this thing started and ran good but had noise in front cylinder. I removed the wave cover and found the head was cracked around the intake side rocker shaft. The previous owner had just replaced this head for the same issue I have the old head that's cracked in the same place. Is this a common issue or what? I have I didn't waste a bunch of money on this thing

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Offline davidpaul

Re: Cracked head a common issue?
« Reply #1 on: January 02, 2017, 03:28:40 PM »
Never heard of cracked heads before, has she been overheated ?
2015 Zforce 800, Dr Pulley weights and sliders, Dobeck EJK, Innovate Motorsports AFR gauge,
Custom exhaust outlet, Ramair foam air filter, Led light bars, Modified air intake, CRD a-arm guards

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Offline NMKawierider

Re: Cracked head a common issue?
« Reply #2 on: January 02, 2017, 04:37:28 PM »
Nope, me either. Never heard of this. Not a common problem for CFM but have heard of some Can Am's with cracked heads after being over torqued...and these 800s are a rough copy of the Rotax 800.
2015 Z Force 800 (53") EPS -
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор (Rodin's) Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage | 9.7" GPS | Bandit Springs Rear & Gen-3 Shocks Front

My Videos On YouTube

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Offline Cosmosdan

Re: Cracked head a common issue?
« Reply #3 on: January 02, 2017, 08:18:04 PM »
Check the mating surface. I think something is up with it, like a low spot by the tapped hole or maybe it's not as flat as it should be, high between the mount points.
2013 Z6 Trail
Iron Baltic skid plates
UE Boom Speaker mount
RZR 800 Shocks
Mostly stock trail riding
25g. Rollers and A1

2016 Outlander max 570
Too new for mods yet

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Offline Z8rider

Re: Cracked head a common issue?
« Reply #4 on: January 03, 2017, 10:25:52 AM »
a stiff or kinked cam chain could have been the initial cause that contributed to the cam chain jumping and having a piston to valve collision. Machine have around 900-1200 miles on it? was it cracked on the boss where the rocker arm shaft slides in, opposite side of the cam gear?

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Offline Dieselboy93

Re: Cracked head a common issue?
« Reply #5 on: January 03, 2017, 12:13:56 PM »
The the ear on the inboard side of the intake rocker shaft is cracked/broken off I'll try and upload some pics later thanks for the input so far

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Offline Dieselboy93

Re: Cracked head a common issue?
« Reply #6 on: January 03, 2017, 12:18:35 PM »
a stiff or kinked cam chain could have been the initial cause that contributed to the cam chain jumping and having a piston to valve collision. Machine have around 900-1200 miles on it? was it cracked on the boss where the rocker arm shaft slides in, opposite side of the cam gear?
This is exactly what happened timing chain tension seems loose to me but haven't looked in the manual guy I got it from is a second generation Mechanic him and his dad put it together you think there may be a faulty tensioner?

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Offline NMKawierider

Re: Cracked head a common issue?
« Reply #7 on: January 03, 2017, 02:39:08 PM »
a stiff or kinked cam chain could have been the initial cause that contributed to the cam chain jumping and having a piston to valve collision. Machine have around 900-1200 miles on it? was it cracked on the boss where the rocker arm shaft slides in, opposite side of the cam gear?
This is exactly what happened timing chain tension seems loose to me but haven't looked in the manual guy I got it from is a second generation Mechanic him and his dad put it together you think there may be a faulty tensioner?
Well...there has been some known tensioner issues....
2015 Z Force 800 (53") EPS -
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор (Rodin's) Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage | 9.7" GPS | Bandit Springs Rear & Gen-3 Shocks Front

My Videos On YouTube

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Offline davidpaul

Re: Cracked head a common issue?
« Reply #8 on: January 03, 2017, 03:24:05 PM »
a stiff or kinked cam chain could have been the initial cause that contributed to the cam chain jumping and having a piston to valve collision. Machine have around 900-1200 miles on it? was it cracked on the boss where the rocker arm shaft slides in, opposite side of the cam gear?
This is exactly what happened timing chain tension seems loose to me but haven't looked in the manual guy I got it from is a second generation Mechanic him and his dad put it together you think there may be a faulty tensioner?

What's the issue with the chain tensioners ?
Well...there has been some known tensioner issues....
2015 Zforce 800, Dr Pulley weights and sliders, Dobeck EJK, Innovate Motorsports AFR gauge,
Custom exhaust outlet, Ramair foam air filter, Led light bars, Modified air intake, CRD a-arm guards

*

Offline NMKawierider

Re: Cracked head a common issue?
« Reply #9 on: January 03, 2017, 03:32:22 PM »
a stiff or kinked cam chain could have been the initial cause that contributed to the cam chain jumping and having a piston to valve collision. Machine have around 900-1200 miles on it? was it cracked on the boss where the rocker arm shaft slides in, opposite side of the cam gear?
This is exactly what happened timing chain tension seems loose to me but haven't looked in the manual guy I got it from is a second generation Mechanic him and his dad put it together you think there may be a faulty tensioner?

Well...there has been some known tensioner issues....
What's the issue with the chain tensioners ?

Not exactly sure but they either are wearing fast in some cases or coming apart.
2015 Z Force 800 (53") EPS -
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор (Rodin's) Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage | 9.7" GPS | Bandit Springs Rear & Gen-3 Shocks Front

My Videos On YouTube

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Offline davidpaul

Re: Cracked head a common issue?
« Reply #10 on: January 03, 2017, 03:53:09 PM »
a stiff or kinked cam chain could have been the initial cause that contributed to the cam chain jumping and having a piston to valve collision. Machine have around 900-1200 miles on it? was it cracked on the boss where the rocker arm shaft slides in, opposite side of the cam gear?

Ok thanks
This is exactly what happened timing chain tension seems loose to me but haven't looked in the manual guy I got it from is a second generation Mechanic him and his dad put it together you think there may be a faulty tensioner?

Well...there has been some known tensioner issues....
What's the issue with the chain tensioners ?

Not exactly sure but they either are wearing fast in some cases or coming apart.
2015 Zforce 800, Dr Pulley weights and sliders, Dobeck EJK, Innovate Motorsports AFR gauge,
Custom exhaust outlet, Ramair foam air filter, Led light bars, Modified air intake, CRD a-arm guards