Vacuum leak from hell

Puch E50 all stock. I have a leak at the top of the base gasket, gone through two different cylinders round port and square port two base gaskets and it's still leaking. I got pissed off and put motoseal on the base gasket and nothing. Is it possible to have a small crack in the case behind the cylinder?

I think I'm talking outload (edited)

Re: Vacuum leak from hell

I might add that when the engine came to me someone had used the better part of a tube of RTV to seal something off.

Re: Vacuum leak from hell

Cases split into top and bottom halves. You will see a hole if there is one.

Re: Vacuum leak from hell

Could the leak possibly be between the case halves ?

Re: Vacuum leak from hell

Found it. In a distant galaxy far far away I went to de anza college auto tech I started to remember one of the first we were told was never use carb cleaner to check for vacuum leaks, It will hit the hot engine and vaporize then get sucked in to the carb, always use something that's heavier then air so what doesn't get sucked in will fall away. too many years and too many brain cells.

Re: Vacuum leak from hell

Dirty30 Dillon /

Good chance you may have mismatched case halves

Re: Vacuum leak from hell

> Jeff Parr Wrote:

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

> Found it. In a distant galaxy far far away I went to de anza college

> auto tech I started to remember one of the first we were told was never

> use carb cleaner to check for vacuum leaks, It will hit the hot engine

> and vaporize then get sucked in to the carb, always use something that's

> heavier then air so what doesn't get sucked in will fall away. too many

> years and too many brain cells.

Carb cleaner works fine, but only use it on a cold engine. If checking a hot engine, WD40 will work.

Re: Vacuum leak from hell

> Jeff Parr Wrote:

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

> Found it.

Good . Where ?

And , pitch the carb cleaner in the trash and never buy it again .

Always use flammable brake cleaner instead . It cleans better , quicker , leaves no residue , does not eat rubber type things and generally costs less .

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