Cracked Piston

Our Gift to You! 1yr Paid Subscription to Quad Off Road!


	[All Forums] [Most Popular] [HL Related] [OEM] [Swap Shop] [Scott's Pics]	Chat Inbox

Cracked Piston

View related threads: (in this forum | in all forums)

Logged in as: Guest

Users viewing this topic: none

Printable Version

All Forums >> [Most Popular Discussions] >> Tech Questions >> Cracked Piston

Page: [1]

Message

<< Older Topic Newer Topic >>

Cracked Piston - 8/26/2008 3:09:57 AM

rocketron

Posts: 267
Joined: 4/5/2005
From: BC, Canada
Status: offline

While tearing down my 660 to replace crank, I noticed my piston is developing cracks in the 4 corners where the skirt starts on the piston. The piston is a 0.10" over Wiseco. Anyone have any idea why this would have happened. It has about 4-450 miles on it. The bike did heat up once but not bad, mabey up to 210.

_____________________________

Mine, 02 698 Grizzly, MBRP Power Tech4, snorkles, 26" Mud Bugs, winch, K&N Filter, jet kit, Outlaw clutch kit, HL Lift Springs, Mudbuster cam, 11:1 Wiseco piston, Hot Rods +4mm crank, 29.5 Outlaws!

Wife's, 04 Polaris 700 twin, 26" mudbugs, HL front wheel spacers, 2" **** lift, Heel Clicker clutch, handguards, winch, reverse override, 3 headlight mod.

Post #: 1

RE: Cracked Piston - 8/26/2008 10:38:47 AM

YAMAFORD

Posts: 1743
Joined: 9/23/2006
From: Oakfield Ga.
Status: offline

exesive piston to cylinder clearance. When the piston reached the top of the stroke it rocks on the way down. You probably have a couple deep ridges at the top of the cylinder.

_____________________________

Kelvin http://photobucket.com/yamaford

funny vid

http://www.myspace.com/yamaford

MINE

04 660 black
27x10 SB's snorkle, rad relocate, 1 ****, 686, clutch kit

WIFES
660 RHINO CAMO 28INCH VAMPS
DADS
03 660 wetlands camo
snorkle,rad relocate ****s on all 4, 29.5 outlaws on ss112 sra wheels
600 grizzly backu

(in reply to rocketron)

Post #: 2

RE: Cracked Piston - 8/26/2008 5:53:13 PM

ectrip78

Posts: 111
Joined: 1/24/2008
Status: offline

_____________________________

03 hauck 800 big bore grizzly/29.5 laws on chrome ss 112s/hauck stage 3 cam/jet kit/pro com cdi/ported and polished head/titanium valves and springs/hauck match ported exhaust/full skid and a arm plates/winch/full snorkel kit//2inc lift /hl x clutch kit/rad relocated/turner axls the works but not done

(in reply to YAMAFORD)

Post #: 3

RE: Cracked Piston - 8/26/2008 5:59:16 PM

runnwo

Posts: 107
Joined: 3/2/2007
Status: offline

over heat will also cause 4 corner scuffing or cracking on any engine

(in reply to ectrip78)

Post #: 4

RE: Cracked Piston - 8/26/2008 6:11:29 PM

kidsoncoffee

Posts: 1756
Joined: 1/2/2008
From: Milton FL
Status: offline

Bore that sucker .60 over and be done with it. Run some 93 and that grizz will turn any tire.

_____________________________

2008 Big Bear 400 4x4
Extreme Products 2" Lift
Custom 2" Snorkel
27" MudZillas
2 Front Apes
1.5" Spacers All The Way Around
DynoJet Jet Kit
UNI Filter
55W Halogen on the Back
More to come......

1999 Yamaha Kodiak 400 4x4
2" Home made bracket lift
1.5" Snorkel
DynoJet Kit
UNI Filter
27" Swamplites on 14" ITPs

Riding Pics at http://www.flickr.com/photos/17656867@N03/
http://www.myspace.com/joshislazy

(in reply to runnwo)

Post #: 5

RE: Cracked Piston - 8/26/2008 10:12:08 PM

rocketron

Posts: 267
Joined: 4/5/2005
From: BC, Canada
Status: offline

No wear on the cylinder. Two very minor marks (won't catch your finger nail) vertically in the bore. Talked to machine shop in town today and he figures it is heat induced or not enough break in time. Did some quick measuring and skirt is shrunk up a bit. Ordered up a couple pistons (1st and 2nd over) to see if he may have gave a little too much clearance. One other note, I did blow a head gasket after installing initially, causing the overheating.

_____________________________

Mine, 02 698 Grizzly, MBRP Power Tech4, snorkles, 26" Mud Bugs, winch, K&N Filter, jet kit, Outlaw clutch kit, HL Lift Springs, Mudbuster cam, 11:1 Wiseco piston, Hot Rods +4mm crank, 29.5 Outlaws!

Wife's, 04 Polaris 700 twin, 26" mudbugs, HL front wheel spacers, 2" **** lift, Heel Clicker clutch, handguards, winch, reverse override, 3 headlight mod.

(in reply to kidsoncoffee)

Post #: 6