Base gasket. Dry or drippy install?

Wolf Wizard /

When installing a paper base gasket or intake gaskets you guys like to shove her on dry or give her a lil’ somethin? I don’t like the idea of a dry install unless I KNOW I was the first one in there and the mating surfaces were not nicked or damaged from prior gasket removal.

I usually just cut all of my own gaskets out of the gray stuff from the auto parts store. Clean the cases with carb cleaner and a clean rag, then brush down the gasket with a super light layer of two stroke, then assemble and torque to spec.

Recently read that silicone and paper gaskets don’t usually do too well together (Which I see advocated for a lot) and that it is best to pick one or the other. But some people will use different sealers like copper seal, yamabond, or even engine assembly grease. Which I guess are not silicone based like rtv. What are your thoughts And experiences? I’m mostly curious because I recently matched my A35 cases for a 70kit and I’ve never had this slim of a sealing surface. (I did not take all the sharpie area off in the picture, the surface now is about 2mm at its thinnest.) and I’d rather have it go togeather correct the first time. And save the headaches of tearing off my top end a bunch.

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Re: Base gasket. Dry or drippy install?

I have always dipped my cereal box gaskets in 2t oil before installing. Dunno why

Re: Base gasket. Dry or drippy install?

Oil helps it compress evenly, it will get somewhat wet during use and I think the basic idea is you soak it first so it's all soaked instead of unevenly wetting during use and potentially compressing more in those spots and enabling a leak.

People also use sealers, for some applications it's worth it, but honestly I mostly use sealers 1) where no paper gasket can go due to clearance, like many engine cases and 2) just to hold paper gaskets in place. it's a pain when the gasket falls and you punch a hole in it when putting in a bolt cuz it slid down and wasn't lined up right. If you glob it all up with silicone though the little bits can make unnecessary mess. I don't think silicone is "breaking down" paper gaskets as I've seen some places suggest, theres some mild acetic acid (vinegar) part of the curing usually (however those types of RTV are usually not good vs gas/oil) but that's not gonna hurt anyone. I think it's more that you just don't get any synergy - if it's a high pressure seal it's gonna leak out whichever is weaker, the paper or the silicone around it. so you don't benefit from both. (except holding it in place)

As for which RTV? doesn't seem to really matter. people have used everything and everyone' got their favorites and there are small differences and none significant. it's like asking what oil to use. some people say use the fanciest nicest most expensive, and someone else has probably run for 15 years with superglue and playdough

Anyway in your case, you can smear some JB or epoxy on the outer edge it'll give the gasket more space to seal and no chance of it hurting anyone. An easy way is clean it up, put your gasket down and put some wet JB there, compress it with the cylinder as you put it on and then you don't need to worry about poishing it flat. it's just there to back-up the seal. I'd also cut that case match a little away off the edges, though any lip in the match creates unwanted turbulence...

Re: Base gasket. Dry or drippy install?

DrGeorgeTompson (Alan) /

I always thought wetting the gasket was to keep it from sticking to the surfaces?

Also instead of sealant you can hold gaskets with a bop of grease. A lot of motorcycle manuals say to grease gaskets. I've never tried using grease on moped gaskets.

Re: Base gasket. Dry or drippy install?

oh yea definitely! wasn't thinkabout that but if you ever wanna reuse, wet it. that's very true. even just getting old gaskets off is way easier. I definitely use grease a lot to hold stuff in place too. whatevers closer hah, usually i'm just using sealer to hold like a trans gasket cuz I just sealed the case with it or whatever and it's right there on the bench. grease is also nice cuz you don't spill oil everywhere when you inevitably knock it over

Re: Base gasket. Dry or drippy install?

RTV has no place even close to a motor , let alone in it .

RTV won't break down a gasket . RTV does become uselessly gummy when exposed to petroleum 'products' . Once it reaches the gummy stage , it easily breaks away and ends up in places that can cause huge problems .

We've run into some of those problems in big Hondas : clogged oil pickups , seized bearings and plugged pressure relief valves .

As for gasket treatments like copper seal or High Tack , use them sparingly .

Grease and oil soaking hurt nothing , unless the gasket is sealer impregnated . Then apply dry .

OEM Honda gaskets are generally applied dry in every application .

Re: Base gasket. Dry or drippy install?

If you are going to use a sealant make sure it is anaerobic. Motoseal, yamabond, curril k2, etc. You can also build up the sealing surface with epoxy if your worried it won't seal.

Re: Base gasket. Dry or drippy install?

Always a thin layer of yamabond or equivalent.

Fuck the haters.

Sometimes just yamabond.

Re: Base gasket. Dry or drippy install?

Wolf Wizard /

thanks for the info dudes!

Going to go with the old faithful and oil the gasket and try a little grease this tkme to hold it in place/ make removal easier.

I’ll leak down test the motor before mounting it to the bike to make sure and if it fails I’ll try building the deck wider in the thin area with jb weld as suggested.

Re: Base gasket. Dry or drippy install?

> P D Wrote:

> -------------------------------------------------------

> RTV has no place even close to a motor , let alone in it .

RTV will definitely decompose in gas/oil. and definitely globs of it can get where you don't want. I could ee this being a problem in 4 strokes clogging small oil passages or whatever but in a 2 stroke it's gonna get ground up or spit out if it's where it doesn't belong. In theory RTV is wrong, but really you're not sealing big holes or gaps with it, it's filling tiny scratches that're ideally mostly isolated from gas/oil anyway. I HATE when I get a bike and there's globs of RTV oozing out everywhere but it usually still works, or at least the RTV is rarely the weakest link...

I honestly believe it doesn't matter, provided you're not being an asshole and just gooping crap everywhere like a mess.

Re: Base gasket. Dry or drippy install?

yea you've got a nice opportunity with JB there cuz it won't require much and it's not directly sealing anything, just providing backup in such a way it'd never potentially wind up ingested.

As for yamabond, hondabond, the anaerobic ones seal without air and ideally you don't have air in well sealing surfaces, but I don't think it matters which one you choose, they're all based on the same chemistry

Re: Base gasket. Dry or drippy install?

Paper gaskets: chainsaw bar oil

Rubber inlet manifold gaskets: Hylotyte Red 100

Airbox boot sealant: weatherstrip adhesive

Oil drain plug threads: PTFE tape

Re: Base gasket. Dry or drippy install?

> JBOT Admin Wrote:

> -------------------------------------------------------

> Always a thin layer of yamabond or equivalent.

>

> Fuck the haters.

>

> Sometimes just yamabond.

Jbot what number Yamabond ?

Re: Base gasket. Dry or drippy install?

4

Re: Base gasket. Dry or drippy install?

I never thought of jb weld. My buddy that helped rebuild my motor mostly fixes landscaping equipment ie. Lawnmowers so he didn't care much about air leaks. He just put my cylinder head on a grinder to clean it. I might just jb weld my cylinder head gasket to the cylinder head and wait for it to dry before attaching it to my cylinder.(edited)

Re: Base gasket. Dry or drippy install?

> kenny s Wrote:

> -------------------------------------------------------

> I never thought of jb weld. My buddy that helped rebuild my motor mostly

> fixes landscaping equipment ie. Lawnmowers so he didn't care much about

> air leaks. He just put my cylinder head on a grinder to clean it. I

> might just jb weld my cylinder head gasket to the cylinder head and wait

> for it to dry before attaching it to my cylinder.

IMHO , That^ would be a mistake .

I usually apply head gaskets dry and apply proper torque . Of course the mating surfaces should be true flat to each other .

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