Cracked cylinder - can I get this welded??

[SXR-FOREVER]

I broke off another 10mm cylinder stud on my cases and went to switch my cylinder on to my backup cases and noticed this crack. I was thinking about getting it welded to just last me until the end of the season or atleast for one or two more days of riding (last days of scheduled filming).

Bad idea? I ordered a girdle kit which I am hoping will help too.

 

[snowxr]

Sandblast and weld it. It should hold.

 

[NathanMoore]

Yeah for sure weld it up. If welded properly, should definitely get through this season and I don't think you'd have any problems for many seasons...with a girdle head.

 

[suva]

It'll last fine with a girdled head.

 

[SXR-FOREVER]

sweet!!! saves me alot of money!

thanks for the replies

 

[wsuwrhr]

Sandblast and weld it. It should hold.

Yep exactly.

Then before you install it, make sure the cases aren't warped or something sitting flat for whatever reason.

Otherwise it will crack again.

Brian

 

[SXR-FOREVER]

do I need to worry about the cylinder getting warped from the welding??

 

[Roo]

My buddy cracked 3 kawi cylinders in a row in this same spot.

Finally welded and reinforced all around the base of the jug.

Seemed to do the trick.

 

[wsuwrhr]

do I need to worry about the cylinder getting warped from the welding??

It should be "flat sanded", but with the sleeves sticking out that isn't possible.

The main thing is you need to make sure the cylinder doesn't "rock" on the cases(with no gasket).

Something isn't flat or is binding which is why it may have cracked in the first place.

Maybe drill the bolt holes slightly bigger.

Just do a little investigating before you put it together.

Brian

 

[SXR-FOREVER]

Awesome thanks.

Anyone know why I keep shearing the cylinder studs?? Getting these things EDM'd out and helicoiled is getting expensive..

 

[wsuwrhr]

Awesome thanks.

Anyone know why I keep shearing the cylinder studs?? Getting these things EDM'd out and helicoiled is getting expensive..

Just curious, how tight are you getting the cylinder?

Maybe too tight?

Brian

 

[SXR-FOREVER]

everything is to the service manual's specs

 

[wsuwrhr]

Wow,

That is a 10MM stud, or is it 8MM?

Brian

 

[SXR-FOREVER]

10mm...its the second one too.

My first one the ez out snapped in it which was really a btch to fix

 

[QJS]

If you use the ADA style girdle (long studs) it will take the load off that part of the cylinder. It will weld fine but its a good idea to clamp it on a flay surface to stop it distorting with the heat but this means either dropping the sleeves out or making a tool so that you can clamp it with the sleeves in.
Chris.

 

[SXR-FOREVER]

I have a upper case that is shot off an old 750 thats still flat on the gasket area, I'll bring that to the welder.

I ordered the ADA girdle kit and it should be here friday. Just waiting on my rods for the crank and then I'll get that rebuilt and I'll be ready to go!

 

[yamanube]

You know for the money you put into this motor.......

 

[SUPERJET-113]

A professional welder should know to preheat the whole cylinder before welding to avoid any warpage.

 

[SXR-FOREVER]

You know for the money you put into this motor.......

I'm workin on it!! People dont like to return emails I guess when you tell them you have cash in hand...:thinking:

 

[wsuwrhr]

10mm...its the second one too.

My first one the ez out snapped in it which was really a btch to fix

Sounds to me like I would be buying some new studs from Kawi or looking at something from ARP before I had to do it a third time.


Brian