check this out i have been chasing my ass trying to fix a problem with my ski it just was not running right and i have to date changed elec box rebuilt my motor (ported while apart) tryed more compression bored my nozzel and i was just about to sell my prop thinking it just wasnt turning it but last night after changing my head to a different o ringed one and it blew the o ring out i put a straight edge across the barrel and it looks like this has been the problem for ages i will let you know in a couple of days if it was . hopefully now i own a ski that has more bottom than a 550 again
bad casting
- Thread starter cambo au
- Start date
douglee25
m3booooy
- Location
- South Jersey
cambo au said:
Sh$t! That'll do it! Glad you found your problem.
Doug
thats a hell of a gap you got there. id imagine that your plugs wouldve been wet.
It could have been a hydrolock that stretched the cylinder, but not to the point of cracking it.
On my original 701 cylinder, I hydrolocked it (from a failed hood liner during a sub), the cylinder cracked and the head was about 2-3mm above the sleeve though the crack was not even 1mm, so the rest was from stretching the water jacket.
On my original 701 cylinder, I hydrolocked it (from a failed hood liner during a sub), the cylinder cracked and the head was about 2-3mm above the sleeve though the crack was not even 1mm, so the rest was from stretching the water jacket.
Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
That is not from the sleeve dropping, that is a bad casting.........If it was just the sleeve, the sholder that the sleeve presses into would be higher up, in this case, all of it is low.
you could get it decked to correct this
you could get it decked to correct this
Mark44
Katie's Boss
- Location
- 100% one place
Damn.. and yes deck that cylinder and you are good to go Like BK said.
Mark44
Mark44
Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
I would guess not.
Mark44
Katie's Boss
- Location
- 100% one place
Check the squish before you deck it. I had to deck my cylinder just to get the proper squish on my ada head. Strange I had to take off .025 to get a squish of.050
Mark44
Mark44
actually i dont think it was a bad casting because they would have to take a run over it after they put the sleeves in so i am thinking that it may have dropped when my barrel was bored apparently they do that occasionally but i am getting it decked to fif it i am looking on the bright side more comp. no it has never run good since i put it back together the plug was not wet but i was getting a little salt on the electrode and could not work out where it was coming from it was showing up fine on the comp guage. Matt e thanks for the thread on porting hopefully now i can see how good it works
feartheride
feartheride
- Location
- St.Catharines,On.Canada
Big Kahuna said:
Like Big K said the sleeve couldn,t have dropped because the entire surface is low
SUPERTUNE
Race Gas Rules
- Location
- Clearwater Fl.
This IS a very common problem with the 701/760 cylinders!
Just getting them hot will do that. I machine the deck on just about every motor that goes through my shop... I also made special tools to clamp sleeves in when installing new big bore liners. I learned a long time ago with that CRAP!:banghead:
Just getting them hot will do that. I machine the deck on just about every motor that goes through my shop... I also made special tools to clamp sleeves in when installing new big bore liners. I learned a long time ago with that CRAP!:banghead: