Air Leak

Mark Younggren /

Set up:

Puch 70cc Athena

15mm treats grandpa intake

15mm cline bing

I have a air leak from intake to carb

Don’t want to break the screw that tightens the carb on intake. It’s a tight fit already for a pop can shim won’t work so what the cure to fix it?

Re: Air Leak

Wrap electrical tape around the intake instead of a beercan shim, that's what I do. Or buy a genuine bing

Re: Air Leak

Mark Younggren /

Wrap around intake end and then slide carb on?

Re: Air Leak

O ring

Re: Air Leak

Dirty30 Dillon /

Don't fucking use e-tape, for god sakes. That's such a bad choice for a gas environment.

Plop an oring into the outlet of the carb like everyone does to stop the airleak at the clamping slot.

Classic symptom of bad clone carb.

Re: Air Leak

Mark Younggren /

Fair enough o-ring it is.

In reality for a tight air leak free set Up should you be able to spray carb cleaner in all the classic spots (carb, intake, head, exhaust) for a couple seconds and have no change in RPMs. Basically is a 100% air leak free set up possibly with zero change in RPM spraying Carb cleaner for a while?

Re: Air Leak

Dirty30 Dillon /

Spraying carb clean is the fast and loose way to find leaks. Obviously, any time you spray an aerosol anywhere near the carb there is a chance you are going to suck up some atomized solvent and cause fluctuations.

The only methodical and complete way to test for airleaks is a leakdown test. Which will expose pressure loss through covered seals or internal leakages between trans/crank, etc.

Re: Air Leak

My peers bash me for using electrical tape. I never have to fuck with air leaks on an intake though. And it's not like duct tape, it doesn't disintegrate. I've had an electrical taped intake on my most reliable, fastest build for 5 years with no issues.

Re: Air Leak

Mark Younggren /

If it works it works and isn’t a safety issue with it. Everyone has electrical tape and finding the right o ring is an easy task but a lot more time consuming then going to the garage and putting a couple wraps of tape around the intake.

Re: Air Leak

> Mark Younggren Wrote:

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

> If it works it works and isn’t a safety issue with it. Everyone has

> electrical tape and finding the right o ring is an easy task but a lot

> more time consuming then going to the garage and putting a couple wraps

> of tape around the intake.

Exactly, as long as you cut the tape after you wrap it so that none of it sticks past the end of the intake and blocks any fuel flow you're good to go.

Re: Air Leak

Pushrod Fifty /

The intake flange ears could be warped, causing a massive air leak.

Re: Air Leak

Mark Younggren /

The bike still runs great and Iam breaking it in so it’s pretty rich still 82 jet and not really WOT for longer then a few seconds.

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