# cracked head -yamaha **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [December 6, 2007, 4:13am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052 "2007-12-06T04:13:48Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\ **Post date:** [December 6, 2007, 4:13am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/1 "2007-12-06T04:13:48Z")
i believe i cracked the head on the 92 blaster last nite:( couple of questions… 1- what causes a crack in the head between the cooling fins? 2- who makes big bore kits at a reasonable price? im really unsure of why it happened thou:rant: ---
**Author:** ![eurodad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/eurodad/32/5988_2.png) [@eurodad](https://forums.speedlife.net/u/eurodad)\ **Post date:** [December 6, 2007, 5:31am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/2 "2007-12-06T05:31:54Z")
i’ve never heard of a head cracking, what makes you think it cracked? and i just had a big bore done by eric gorr on a 02 rm250 it’s now a 265. it was about 400 bucks for the bore and replating and a piston and gaskets. i’ve had 2 other cylinders done by him also. send this guy an email and ask him for pricing. [ericgorr@hotmail.com](mailto:ericgorr@hotmail.com) he owns this -\> [http://ericgorr.com/](http://ericgorr.com/) also try moto 814. he only does 2 strokes. not sure if he does atv’s he is in the process of a move, i don’t think he was taking business till middle of dec. i’ll be sending him my cylinder for my 07 rm 250 soon for a big bore and porting [http://www.moto814.com/](http://www.moto814.com/) ---
**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\ **Post date:** [December 6, 2007, 7:10am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/3 "2007-12-06T07:10:13Z")
i heard a small pop then the bike started losing power and rpms eventually it stalled and wouldn’t restart.as i was kicking it over it appeared that about kick 15 there was liquid being forced out of the head as a wet line in the head before it would evaporate. i really need to look at this closer ---
**Author:** ![smokeyburnouts](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/smokeyburnouts/32/5987_2.png) [@smokeyburnouts](https://forums.speedlife.net/u/smokeyburnouts)\ **Post date:** [December 6, 2007, 7:53am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/4 "2007-12-06T07:53:07Z")
probly either that or the studs pulling out (came un-seated). that happened on my Quadracer 250 when i raced it, awhile back. if so, that might be some big money cause the coolant can seep down into the low end and smoke your crank bearings. edit: nevermind. blasters are air-cooled ---
**Author:** ![JackdUp](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jackdup/32/6015_2.png) [@JackdUp](https://forums.speedlife.net/u/JackdUp)\ **Post date:** [December 6, 2007, 7:57am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/5 "2007-12-06T07:57:38Z")
I’d guess that it was a manufacturing defect. Air pocket in aluminum and stressing it caused it to crack the surrounging material? ---
**Author:** ![SP71Supra](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sp71supra/32/5955_2.png) [@SP71Supra](https://forums.speedlife.net/u/SP71Supra)\ **Post date:** [December 6, 2007, 12:02pm UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/6 "2007-12-06T12:02:24Z")
Blasters NEVER die!!! I used to have one, it was so much fun… I beat the piss out of it, ran damn near straight gas in it one time, that bitch kept on truckin! ---
**Author:** ![wishmasstir](https://avatars.discourse-cdn.com/v4/letter/w/a88e57/32.png) [@wishmasstir](https://forums.speedlife.net/u/wishmasstir)\ **Post date:** [December 7, 2007, 9:10am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/7 "2007-12-07T09:10:21Z")
[http://pubat0.pennswoods.net/cgi-bin/classifieds/index.cgi?mode=view&viewcategory=Motorcycles\_ATVs&adindex=26724319047](http://pubat0.pennswoods.net/cgi-bin/classifieds/index.cgi?mode=view&viewcategory=Motorcycles_ATVs&adindex=26724319047) ---
**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\ **Post date:** [December 7, 2007, 12:33pm UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/8 "2007-12-07T12:33:05Z")
nice post above- i guess blasters don’t die after all well i cant locate or duplicate the cracked head theory so why will it not start after those funny circumstances:( i have spark to the plug i guess make sure gas is getting there and clean it up real good before a tear down inspection ---
**Author:** ![smokeyburnouts](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/smokeyburnouts/32/5987_2.png) [@smokeyburnouts](https://forums.speedlife.net/u/smokeyburnouts)\ **Post date:** [December 7, 2007, 1:43pm UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/9 "2007-12-07T13:43:16Z")
is it siezed? if the studs in the head unseat, then the head isnt torqued and can seize it or cause it to not start. its unlikely but possible. like i said, it happened out of nowhere on my 250R. the only way i knew was cause coolant seeped out (and into the cyl) since youre air-cooled it wont seep, but it would still mess things up. ---
**Author:** ![rmrider897](https://avatars.discourse-cdn.com/v4/letter/r/aeb1de/32.png) [@rmrider897](https://forums.speedlife.net/u/rmrider897)\ **Post date:** [December 7, 2007, 1:57pm UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/10 "2007-12-07T13:57:29Z")
Was it cold out? Did you turn it on and gas the shit out of it? If your head is really cold and then you start it, it will get really hot on the inside while still being cold on the outisde and sometimes the delta T will cause bad things. ---
**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\ **Post date:** [December 7, 2007, 3:11pm UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/11 "2007-12-07T15:11:17Z")
it’s not seized at all i don’t even think the compression is out of whack btw i have a compression tester what should it be? it was 28 degrees out side and i rode it for about 20-30 min before this happened ive been riding it in cold snowy weather ever since i bought it in 2005 an never had a problem ---
**Author:** ![eurodad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/eurodad/32/5988_2.png) [@eurodad](https://forums.speedlife.net/u/eurodad)\ **Post date:** [December 7, 2007, 9:14pm UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/12 "2007-12-07T21:14:09Z")
your not the greatest at descibing sounds. was it a metal like pop, was it a pop out the exhaust, a pop out the airbox? could be a foled pludg again. the liquid you may be seeing could be fuel from a flooded motor being forced out a slightly loose sparkplug or ? or? ---
**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\ **Post date:** [December 8, 2007, 4:36am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/13 "2007-12-08T04:36:11Z")
it was a metal pop- and ill try a new spark plug ---
**Author:** ![spoolinsteve](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/spoolinsteve/32/6026_2.png) [@spoolinsteve](https://forums.speedlife.net/u/spoolinsteve)\ **Post date:** [December 9, 2007, 9:34pm UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/14 "2007-12-09T21:34:18Z")
wait so is it cracked or not? if the heads cracked between the fins what would a new plug do? did you hit a puddle or water or anything when this happened? scratch all that i re-read. any more news? ---
**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\ **Post date:** [December 10, 2007, 4:30am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/15 "2007-12-10T04:30:38Z")
> [@Open Call Out](https://forums.speedlife.net/t/open-call-out/32317/150): > > wait so is it cracked or not? if the heads cracked between the fins what would a new plug do? > > did you hit a puddle or water or anything when this happened? > > scratch all that i re-read. any more news? i cant duplicate the head thing- no water but lots of snow-i have to try the plug and take a compression test once i find out what that number should be ---
**Author:** ![wishmasstir](https://avatars.discourse-cdn.com/v4/letter/w/a88e57/32.png) [@wishmasstir](https://forums.speedlife.net/u/wishmasstir)\ **Post date:** [December 10, 2007, 7:52am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/16 "2007-12-10T07:52:45Z")
blasters compression stock is 125-130psi, this is for sea level though so yours might be off but as long as its close. remember to hold the throttle when you kick it ---
**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\ **Post date:** [December 10, 2007, 8:05am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/17 "2007-12-10T08:05:29Z")
thanks! ---
**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\ **Post date:** [December 15, 2007, 9:16am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/18 "2007-12-15T09:16:41Z")
remember this was a cold day there was a small pop-started losing rpms and power rode it for a 1/4 mile and it died with no restart well replaced the plug no start gas on the plug was minimal so i did a compression check compression was 40- yes 40 so what causes compression to be that low ? and what to do next to fix this ??? or who fixes these?? ---
**Author:** ![GNocide](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gnocide/32/5947_2.png) [@GNocide](https://forums.speedlife.net/u/GNocide)\ **Post date:** [December 16, 2007, 10:11am UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/19 "2007-12-16T10:11:30Z")
COMPRESSION SHOws 40 with the throttle open what is the normal cause of that? what do look for and do next? i have verified spark and a new plug but no start condition anyway. although i cant tell you if the spark im seeing is enough. ALSO there is minimal gas on the plug so thats inconclusive. ps anybody that wants to see/lend a hand and is around irwin- let me know- i don’t have a trailer or tow vehicle. ---
**Author:** ![eurodad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/eurodad/32/5988_2.png) [@eurodad](https://forums.speedlife.net/u/eurodad)\ **Post date:** [December 16, 2007, 12:57pm UTC](https://forums.speedlife.net/t/cracked-head-yamaha/194052/20 "2007-12-16T12:57:29Z")
> [@FS: 1995 Talon Tsi](https://forums.speedlife.net/t/fs-1995-talon-tsi/25055/48): > > COMPRESSION SHOws 40 with the throttle open > > what is the normal cause of that? > > what do look for and do next? > > i have verified spark and a new plug but no start condition anyway. > although i cant tell you if the spark im seeing is enough. ALSO there is minimal gas on the plug so thats inconclusive. > > ps > anybody that wants to see/lend a hand and is around irwin- let me know- > > i don’t have a trailer or tow vehicle. if the compression is 40 no need in looking at anything else or worrying about the spark or amount of fuel. time to tear into it. [Next page](https://forums.speedlife.net/t/cracked-head-yamaha/194052.md?page=2)