what to do with these air leaks?

[mopar1rules]

i just got done putting my engine back together (it was apart for case porting) and now it has a big air leak. at least some of the air leak is coming from both reeds, hole where boost bottle plugs into rubber intake boot, and possibly the cylinder base gaskets. i sprayed starting fluid to confirm this. the crankcase seems to be ok. couldn't get it to rev up when spraying along the seam line. maybe the base gaskets aren't leaking, and that the leak by the reed block is sucking up the fumes, before it gets to the cylinder base gasket. i put anerobic gasket sealer on the base gaskets, so i would think that they would be sealing fine. i didn't put any on the reed gaskets, so maybe its just those? what do you guys think? what do you think i should do, for a greater chance of having these gaskets seal in the future? they were all brand new gaskets (moose racing brand from parts unlimited) and torqued down to the specs in the service manual.

Edited July 19, 2008 by mopar1rules

[shee4speed]

Put some permatex gasket sealer on them and that should take care of it, if it's your reed gaskets.

[mopar1rules]

like the orange high temp stuff?

[shee4speed]

I think the grey stuff would be sufficiant.

[Snopczynski]

I would a leak down test if you think you have that many leaks.

[tgbanshee]

I used Threebond 1211 on my case halves along with a super thin layer on the cylinder base gaskets and the reed valve gaskets and the motor was air tight when I did the leakdown test. This stuff is pretty good, Jeff at F.A.S.T. has it as well as cascade-innovations you might wanna give it a shot. Also check to make sure it isn't leaking from the right side of the crank, sometimes air can get past that rectangular keyway in the crankshaft and leak into the clutch area.

 

Edited July 19, 2008 by tgbanshee

[mopar1rules]

i'll tear down and do a leak down test tomorrow. thanks guys for all the input so far.

[shee4speed]

I used Threebond 1211 on my case halves along with a super thin layer on the cylinder base gaskets and the reed valve gaskets and the motor was air tight when I did the leakdown test. This stuff is pretty good, Jeff at F.A.S.T. has it as well as cascade-innovations you might wanna give it a shot. Also check to make sure it isn't leaking from the right side of the crank, sometimes air can get past that rectangular keyway in the crankshaft and leak into the clutch area.

 

I'm gonna get me some of that stuff. Thanks! Edited July 19, 2008 by shee4speed

[C&B]

threebond is the shit!!

[mopar1rules]

i tore the top end back down yesterday and noticed the head gasket wasn't sealing either. there was coolant between the head gasket and head. i also noticed it was wet and green at the bottom of the clutch side cylinder. i know people said if it gets wet there with coolant, that the rubber plugs on the bottom of the cylinder are junk. well, it just had brand new ones put in both cylinders, just to be safe. i think i'm going to be putting some right stuff on them, before i reinstall the top end. i also, noticed that the mag side intake boot, is now torn on the bottom side. i also noticed that on my intake boots, the little rib thats suppose to seal up against the reed assembly itself, is not sticking up above the rest of the rubber intake boots mating surface. so, it will never act as a seal. no wonder they leak. i think i'm going to order new intake boots, and order all yamaha gaskets this time, as this moose kit bit me in the ass this time around.

[shee4speed]

Good deal! sounds like you got her all under control. You'll have her running before long.