hemi heads

[3ban5shee0]

my banshee keeps blowing up after about every 5 hours its happend twice now

 

i got the banshee 3 years ago 4mm stroker kit hemi heads .60 over ran good blew it up by washing it some water ran down the intake and into the cylinder so i called my buddy told him hes like bring it over so i took it over he bored it .80 over put it together called me said its not running like it did so i figured maybe it just needs broken in so i rode it wasnt right so i parked it got on it a week later rode it for a while blew up right piston looked like it melted got another set of used jugs that was bored .60 over got them bored .80 over put it together same thing blew up about 5 hours of ridding so i started asking around and someone told me hemi cubs are only meant to run .60 over and under anything above that will cause it to blow up

just wondering if any body has ever heard of that

thanks for your help any advise is greatly appreciated

[cb67rs1]

man if you are buring holes in the pistons and have changed jugs you have a problem with you head or you intakes sucking air somewhere. what kind of head do you have and what kind of intakes?

[rebelbanshee2]

what compression did it have and what gas were you running?

[3ban5shee0]

man if you are buring holes in the pistons and have changed jugs you have a problem with you head or you intakes sucking air somewhere. what kind of head do you have and what kind of intakes?

451682[/snapback]

i have a hemi head i forget the full name of them and i beleave stock intakes its been 3 years sense ive messed with it. it ran great when the it was bored .60 over but after it blew up and i bored 80 over thats when it started to mess up it didnt have the power it did when it was .60 over both times

[3ban5shee0]

what compression did it have and what gas were you running?

451683[/snapback]

im not sure about the compression but i was running 103 octane

[23champ]

Not sure if your talking about a Vito's Hemi Head or not, but thats what I'm running. Who ever told you that the head is only good for 60 over is full of shit.

Your prolly suckin air somewhere. Did you make sure to remove all the gasket material from the cases when you put the motor back together. Also make sure your intake gaskets are good.

 

If you have an air leak it will run lean...Does it rev up a lot, and possibly surge on idle?

[3ban5shee0]

what about when i washed it if the water ran into the cylinder and warped the head

everything looks good i didnt rebuild it my buddy did im not sure if he cleaned everything or not but im sure he did

and yes they are vito hemi heads

Edited December 25, 2005 by 3ban5shee0

[23champ]

I dont think it blew up by washing it. I've seen motors completely submerged in water. One of my buddies got so much water in his banshee that it hydrolocked.

We had to take the sparkplugs out, tip it over and run the kickstarted trough to get all the water out of the cylinders. We cleaned the plugs off and dumped a little gas down the cylinders, drained the bowls on the carbs, and it fired right up...he rode it home, changed the tranny oil and cleaned the air fliter. Its been running ever since, and that was about 2 yrs ago. 2 stroke motoers are tough as nails.

[tOj]

I dont think it blew up by washing it.  I've seen motors completely submerged in water.  One of my buddies got so much water in his banshee that it hydrolocked.

We had to take the sparkplugs out, tip it over and run the kickstarted trough to get all the water out of the cylinders. We cleaned the plugs off and dumped a little gas down the cylinders, drained the bowls on the carbs, and it fired right up...he rode it home, changed the tranny oil and cleaned the air fliter.  Its been running ever since, and that was about 2 yrs ago. 2 stroke motoers are tough as nails.

451797[/snapback]

 

 

That's some crazy sht right there..

[wayfst]

change the cdi box, sounds like your timing is going nuts.

[Shee-Male]

If the engine hydo locked it can either bend a rod or if its a stock crank it can turn the counter weights on the pins and put it out of phase. I would pull that thing apart and make extra sure!

[3ban5shee0]

if i had a warped head what would it do

 

i never had a problem until i washed it i tried to start it it wouldnt run at first but it finally started then like two seconds later it blew up and there was water and dirt in the right cylinder so i just guessed thats what cuzed it

[Cotton eyed Joe]

if i had a warped head what would it do

 

i never had a problem until i washed it i tried to start it it wouldnt run at first but it finally started then like two seconds later it blew up and there was water and dirt in the right cylinder so i just guessed thats what cuzed it

452012[/snapback]

I wouldn't worry about having a warped head.

 

I'd worry about something not sealing on the intake side. Look at your carb boots, and inspect for cracks. Also check the gaskets for the intake boots as well.

 

If you have stock carbs, the tops have gaskets that can go bad or get debris trapped between them and the sealing area and allow air to suck past, causing a lean condition from what I've heard.

 

A warped head would probably cause more cooling system problems I'm thinking.

[23champ]

If the engine hydo locked it can either bend a rod or if its a stock crank it can turn the counter weights on the pins and put it out of phase. I would pull that thing apart and make extra sure!

451908[/snapback]

 

 

The motor had already died before it sucked all the water into it. We pulled the bike up on dry ground and tried to start it, but the kickstarter was locked up tight..thats when it was hydrolocked.

[Ducman]

I agree with the above air leak theories.