Did a leakdown test... Fount a leak

[fliip]

I found a leak where the cases come together .... if you are looking at the engine from the front of the blaster, it is just to the right and below of the exhuast outlet. Could this be a bad gasket and a crankseal, or just a bad gasket? :-/

 

[stephen12091985]

if its where the cases split there is no gasket and you need some yamabond and you will have to split the cases to fix it.

 

[brandoz28]

what he said^^^ and are you positive its between the cases and not the base gasket? get some soapy water and spray it around where you think its leaking and do the test again

 

[fliip]

So, There is no gasket that goes between the cases? Or are you telling me that my gasket is junk? I wish I could say it was my base gasket, but I sprayed soapy water everywhere... I put 10 psi of pressure in it and it all leaks out in about 15 - 20 seconds. I sprayed where the cases meet and I got alot of BUBBLES!

 

[brandoz28]

ok, the only thing between the cases is a sealer. like yamabond. you can get it from the dealer or rockymountainatv.com

 

[stephen12091985]

ok, the only thing between the cases is a sealer. like yamabond. you can get it from the dealer or rockymountainatv.com

yep i just bought some tonight cuz i got the same problem lol

 

[fliip]

Okay, thanks for all your help! Looks like I'll be splitting my cases after I get my yz250 running..... So, you guys think it is just the cases not sealing? Could it also be my crank seal?

 

[stephen12091985]

could be the cranks seals to.you will have to take off ur flywheel and stator to get to that one and take off the gear inside the clutch cover that goes on the crank to get to that one then do the leaktest and spray soapy water on it

 

[brandoz28]

you have to split the cases anyway, just put in new crank seals.

 

[slickerthanyou]

you have to split the cases anyway, just put in new crank seals.

I agree! YA have it apart so for few extra bucks can't hurt.

 

[fliip]

Yup, might as well. I guess its pretty much a free job exept for the seals... Thanks for all your help!