what a milled head has done for me

[blaster199]

this first bike is my dads the second bike is mine both of our bikes screwed the topend after putting a milled head on

now my bike nothing like my dads but my milled head is now for sale if anyone wants it lol

 

[specialized7]

who did the work on the heads?

 

[super noober]

I agree^^^^^^ seems like it could have been poor quality work?

 

[blaster199]

they were both bought off ebay my dads when he bought it ,it didnt even have a lip on the head

 

[tjsdaname]

did you run race gas with the head??

because if there milled more that like .35 thats your prob...

 

[TopTechKid27]

i work on all types of 2 strokes and honestly they look like they got VERY hot. this can be caused by running the wrong type of gas but most of the time is caused by running lean. did they tell you how much was milled off?

 

[blaster199]

on mine i ran a vp race fuel and it was suppost to be to where you can run pump gas but no my dad did not but yes i ran vp race fuel and the spark plug looks perfect on mine just the right color you want

 

[TopTechKid27]

yea yours just looks like it got hot some how....but idk how. your dads on the other hand looks like it got really hot and the piston melted broke off pieces and slammed into the head. the same thing was wrong with mine when i bought it and head wasnt even milled.

 

[blaster199]

he was at the sand dunes when his happen i was told your bike always run hotter there

 

[FLOTEK]

if the head is not cut right and or the wrong fuel is used ,thats the result-detonation

 

[TopTechKid27]

that could be i dont happen to have any dunes in MO to find out on. what size jet was he running when it blew.

 

[blaster199]

we went to little sahara in ok. it was well worth the trip i dont know what size of jet but he was running rich

 

[blasterfreek30]

u said there was no lip on the head, was the piston hitting the head???

 

[blaster199]

i think on my dads its did cause the head will need work if it is reused but my head is just fine

 

[ron89]

damn they look badd.. that fist pic looks like she ran lean and or had detonation.. from the looks of it they were cut past .030 but hard to tell..

if it was me i would of mounted the head and did a compression test to see where i was at cause, if you needed to run 100+ and you only ran 93 then there you prob why they ran lean...

 

[TopTechKid27]

on the first pic of your dads motor whats with all the blow out on the head did that happen when it blew or did it always leak at the head gasket.

 

[blaster199]

we didnt do a test cause at the time we didnt know that if you mill off so much you have to run a race fuel on my dads it ever has a leak it quit when we were way out in the sand and it had ro start do we could get back to camp so we kicked till all our legs were tired to get it running so we could get back to camp we were miles away that might be the reason his is worse and he was not running a race fuel

 

[hickskateboarder]

put oil in the gas?

 

[Paulie B]

put oil in the gas?

HAHAHAHAHA
You know they did

 

[Wildcard2]

You can get away with milling much more than .030" off the stock head, but it requires chamber work. If they simply milled it down too far and didn't rework the chamber your resulting compression would be to high and cause massive heat and detonation for sure.