how do i know if a head gasket is bad? - Yamaha Raptor Forum

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Old 02-10-2012, 04:10 PM   #1 (permalink)
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Default how do i know if a head gasket is bad?

hey fellas, been a while since ive been on but heres my question. i had all the tell tale signs of a bad head gasket, coolant smell out of the exhaust, coolant in the exhaust pipe itself ect. i have the motor on the bench, got the gasket out. can you actually look at the gasket and tell that it is bad? anything else it can be? i just want to be 100% sure before i put her back together. also, there was coolant in one of the bolts that holds the cylinder to the crank case. the black coating on the head gasket was gone right where the coolant was in that bolt. also coolant drips on the valves. maybe i answered my own question. just wanna be sure. should i inspect the water pump as well?
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Old 02-11-2012, 09:46 AM   #2 (permalink)
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Im no expert but i would say your head gasket is leaking for sure. You might want to check for warpage were the cylinder and head meet to make sure its perfectly flat. That would make it leak for sure and if it ever got hot it could warp. Hopefully its just a crummy gasket. I wouldnt expect any problems with the water pump. Good luck=)
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Old 02-11-2012, 10:00 AM   #3 (permalink)
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a few good pics would help, but you probly answerd your own question...How old is the gasket?
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Old 02-11-2012, 10:53 AM   #4 (permalink)
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a few good pics would help, but you probly answerd your own question...How old is the gasket?
i rebuilt in '09. I hope nothing is warped. Runs mint besides this problem. Never has overheated. how long should these gaskets last? should be a long time right? before the build the motor was never touched until i put in new internals.
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'01 660
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wiseco 11:1 piston
hotcams stage 1 cam
hotrods rod
stock valves/springs
dalton pro clutch basket
barnett dirt digger clutch
l&a one way
DG exhaust
pro design intake w/k&n
160L 165R 25pilots clips 5th position
12t front 41t back sprockets
holeshot hd's

front end doesnt touch the ground much!
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Old 02-11-2012, 10:56 AM   #5 (permalink)
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ill check everything for warpage with a straightedge (tomorrow hopefully if the wife lets me out to work on it lol) and just put her back together. luckily i had a spare headgasket from my rebuild. hopefully it will be a problem solved.
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'01 660
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hotrods rod
stock valves/springs
dalton pro clutch basket
barnett dirt digger clutch
l&a one way
DG exhaust
pro design intake w/k&n
160L 165R 25pilots clips 5th position
12t front 41t back sprockets
holeshot hd's

front end doesnt touch the ground much!
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Old 02-11-2012, 11:12 AM   #6 (permalink)
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ill check everything for warpage with a straightedge (tomorrow hopefully if the wife lets me out to work on it lol) and just put her back together. luckily i had a spare headgasket from my rebuild. hopefully it will be a problem solved.
Hahaaahaha..."If the wife lets me out to work on it"... I know that feeling..
Good luck with her....& the Rappy
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Old 02-11-2012, 11:22 AM   #7 (permalink)
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lol. ill keep you posted. im aching to go for a ride here. been a while
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'01 660
686 build
wiseco 11:1 piston
hotcams stage 1 cam
hotrods rod
stock valves/springs
dalton pro clutch basket
barnett dirt digger clutch
l&a one way
DG exhaust
pro design intake w/k&n
160L 165R 25pilots clips 5th position
12t front 41t back sprockets
holeshot hd's

front end doesnt touch the ground much!
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Old 02-11-2012, 11:31 AM   #8 (permalink)
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any local machine shop should be able to re surface ur head. i had car quest re surface the head on my rappy and it was like 20 bucks. just an idea
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Old 02-11-2012, 11:36 AM   #9 (permalink)
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any local machine shop should be able to re surface ur head. i had car quest re surface the head on my rappy and it was like 20 bucks. just an idea
They often leak between the layers. Take the head gasket apart to see........
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Old 02-11-2012, 07:24 PM   #10 (permalink)
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you would know better than me willy! lol had mine surfaced because is was not flat and popped 2 head gaskets before i figured it out
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