Finding a vacuum leak

In this video I investigate whether the Yamaha 20 HP has a vacuum leak causing it to go lean. I do this by spraying LPG over the crank case and then also blocking off the exhaust and doing pressure test on the crank case. For outboard repair information, checkout my website: https://outboard.dangarmarine.com/guide If you are enjoying this channel, please consider making a donation to https://www.paypal.me/dangarstu or become a Patreon of Dangar Marine at   / dangarmarine   T-shirts and other merchandise available at https://teespring.com/stores/dangar-m... Common items used in these videos are available from my Amazon store at https://www.amazon.com/shop/dangarmarine Dangar Marine is proudly sponsored by MarineEngine.com. MarineEngine.com supplies a wide variety of spare parts for many brands of outboard motors. If you are in the US, be sure to check out their online store http://www.marineengine.com/ All music available at http://soundscloud.com/dangarstu