Modern Vespa

Hi everyone, was just wondering, when closing up engine cases, have any of you added "gasket sealer" to the new engine gasket (and other gaskets)? If so, which one (brand) have you used? Is it a good idea to use sealers?
Thanks
Fab

The service manual says "spread seal paste on both surfaces of the gasket".

Everyone has their favorite. I use MotoSeal.

That's putting it mildly.

I use Permaseal aviation-grade gasket sealer. Others swear by hondabond/threebond/yamabond. Others use RTV silicone. Still others insist that if grease was good enough for the OG, it's good enough for you.

Hylomar spray.

I am a convert from the days of grease before converting to permetex and then the one true gospel of hylomar (and the angels did sing).

Find said religion here:
https://shorturl.at/31FXd

always

Is that like the copper spray, but for paper instead of metal?

Hi gang, thanks for the replies. I was looking around and read that good, old grease does the job too? I didn't even consider grease. I have some high-temp moble1 grease...would that work well? I just don't want to put anything really sticky that will make it tough if i need to reopen the cases.
Thanks
Fab

I mentioned plain ol' grease!

Yes, you could use it and it can work. What you'll ultimately find is that the more modern solutions are more likely to work correctly over the long-term.

The Permatex aviation gasket cement is the least sticky, while still working. You can generally get the gasket back off pretty easily, then clean up the sealer with acetone.

Pretty much yes... I think copper spray may be rated for higher temps but Hylomar goes up to 425+ IIRC

It's just so easy to spray the gasket surfaces and the mild drying times gives you a zero worry window to get it on the cases and the cases closed. None of the options listed will make it harder to reopen the cases, albeit some of the more sticky ones will ruin your gaskets if you have to reopen the cases.
But... that is a small price to pay for piece of mind.

In the case(s) of hondabond/yamabond/threebond, I beg to differ, but other than that, yes.

I like motoseal, but here's a little trick I've developed. Put it only on the lower half of the case gasket and selector box but all of the cylinder base gasket! That way when parked, there's no drips and you don't have to worry about air leaks.

Fair... I have exp with the three I mentioned: grease, permatex, and hylomar. (Case separator always wins.)

Yikes that's pricey must be good.

never used the spray but have been using Hylomar from a tube or can since the 80s.

nice thing is if you need to split the case you can often do it without destroying the old gasket. Nice for road side work.

What ever you have lying around. .... Honestly, I use Motoseal because I bought a fairly large tube of it 15 years ago and still have half of it left.

+1 to both of the below statements.

Beauty about the spray is that whatever isn't used at that sitting, stays good in the can. Sort of like spray paint vs. a can of paint. Plus the spray gives a nice, even, light coat, without having to muck around smearing it with your finger, or some other appendage, or some kind of tool.