Yamaha VStar 250 Petcock Test

How does a petcock on an older style carbureted bike work, and how can you bench test it? Watch this video to learn what may be a problem with a petcock and how you can check if it is indeed a problem or not.

[@Sol-vk5pj]

Thanks for sharing . I did not know how the vacum system works .

[@marsoelflaco5722]

A cliff hanger...we'll never know what the problem was...🤷🏽‍♀️

[@flyingcatsofthesalishsea.]

I had a air leak at the frame to carb rubber gasket and I replaced with a new one and it turned out to be the wrong one. So after ordering another it turned out they are different, the new one works. The bike would lean out so that tells me air leak. Thanks for the upload.

[@davidgiffordsr.930]

Thanks. I'm having the same problem on and off after it sat all Winter. Rode about 2 + miles, it shut down totally thrice, a few times ran rough, but managed to keep going, Filled up the tank a little over 1 mile in, half way. Now, I'm afraid to ride it. Oh, it's running slower too, and will stop if I don/t keep the throttle open a bit. Haven't taken it off full choke yet.

[@quancena5772]

I had my bike died after 42km when i had just filled up, but it was weird to me because i had put about 5 liters of fuel in it, i checked the gas tank and it was pretty much half empty (around 4 lt of fuel left), so i switched to "reserve" and it was fine.
Later on the ride i went back and switched it to "on" again and it immediately died.
I'm pretty sure the lines are backwards, "on" is actually "reserve" and "reserve" is "on", my bike was used so maybe someone messed the lines up in the past (it had a carbureter rebuild done to it), it could be that your sisters in law's bike has the same issue?
42km is kind of in line with what a full reserve tank would give me because i've tuned the carb relatively lean, and i've gone another 60+km on what the petcock says it's "reserve" without it dying on me so i'm pretty sure that was the issue.
Could you update on the matter if it was something else in the end?

[@Jimbo-v3m]

clogged screen inside the tank

[@donj.5284]

Thanks for sharing!

[@jaicornelius9359]

Pretty informative

[@tio123ist]

That was a cool vid thanks for sharing

[@uthe54]

Glad it was helpful to you!

[@LuckyTown77]

I saw, " it was a covid " . Need a long ride to clear my brain fog.

[@tio123ist]

@@LuckyTown77 😆

[@harryblackburn9556]

I replaced mine with a manual petcock for a Vstar 650 and an electric fuel pump. No worries.😀

[@brandynwangen5704]

It’s probably just the carb bowl sticking and with my bike if I put something under 91 gas it going to have a harder time staying running

[@Tubaka01]

That was really informative. Did you ever figure out what was going on?

[@uthe54]

The problem seemed to have gone away on its own. Could've been a number of things. Often times it seems when dealing with motorcycles, sometimes those odd fuel issues go away on their own and we can blame anything from old fuel, ethanol, or debris.

[@bestintentions6089]

Thats good to know, I am planning to get this one I hope it will be mostly worry free.

[@user-gb5gt9if4u]

fuel pump on other side is also vacuum operated,

[@ronaldogonzales115]

when you ride what setting should you have the petcock on?

[@idkuokjones9056]

On

[@osogran8458]

Qué le pusieron en español por favor

[@calebpye6259]

Lost my petcock diaphragm spring hellllp

[@mike_sab]

Have you found it?

[@osogran8458]

En español por favor