Newbie with questions. - Honda Rebel Forum
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post #1 of 8 Old 08-29-2019, 08:46 AM Thread Starter
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Newbie with questions.

What is the gas valve for? There is a valve, or switchshaped like a key right under the gas tank, and I have no idea what it is for. Ithink it is always set to the open position, and when I move it to the closedposition it starts dripping gas, is this what is supposed to do? The previousowner had no idea that the valve existed and never touched it. He always leftit in the on position. Should I look into replacing the piece?

86 rebel bobber 450
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post #2 of 8 Old 08-29-2019, 09:26 AM
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That is called a petcock. It is not supposed to leak.

The petcock has 3 positions when intact; On, off, and reserve. On and off are easy to understand. Reserve allows you to get an advanced warning that you will run out of gas in 20 miles or so. Most riders put their petcock to the on position when riding. Some smarter riders put the petcock to the off position when not riding. When you are riding in the on petcock position and the gas level is getting low in the tank, the engine will sputter as it runs out of gas. A quick flip from on to reserve will restore the engine to running and you have to start looking for a gas station.

I use the odometer to tell me when to fill the gas tank. I refill every 100 miles.

1985 CMX250 ... 1986 CMX450 ... 2005 Ruckus 50
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post #3 of 8 Old 08-29-2019, 10:03 AM
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Turning the petcock to the off position when parking the bike is a good habit to develop. It will prevent gas from overflowing or getting past the rings and into the oil (neither of which is a good thing) in case the float valve sticks.
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post #4 of 8 Old 08-29-2019, 10:21 AM
 
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Originally Posted by flitecontrol View Post
Turning the petcock to the off position when parking the bike is a good habit to develop. It will prevent gas from overflowing or getting past the rings and into the oil (neither of which is a good thing) in case the float valve sticks.
The "float valve" mentioned above is in the carburetor. It is a valve that operates similar to the float valve in your toilet tank, to regulate the amount of gas in the carburetor bowl. As carbs get older and/or gunked up, the valve can stick open causing it to not function properly and allow gas to overflow (think of a "running" toilet, but instead of water getting wasted running down the drain, it is gas that overflows into the engine block.)

As mentioned, it's best to turn the petcock to the closed or off position when the motorcycle is not in use. It amazes me that the previous owner did not even know that it existed.

Also, practice sitting on the bike and reaching down to flip the switch to the various positions by feel, without looking/seeing it. You may need to do this while riding if you run low and need to switch to reserve. You may also need to do this if you forget (as I have done on more than one occasion!) to set the valve to "open" and only discover it is still "off" as you're pulling onto the street!

.
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post #5 of 8 Old 08-29-2019, 11:01 AM
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Since the previous owner didn't know about the petcock, he probably didn't know to drain the "puke tube". It's shown in this diagram (top right), and will be the only tube with a plug in the end. It's part of a cluster of tubes behind the right side of the engine. Replace plug after draining. https://www.hondarebelforum.com/f36/...ubes-9200.html

Other helpful info you may or may not know; do not use any XXW-30 automotive oils in the Rebel. They contain friction modifiers that will ruin the clutch. XXW-40, and XXW-50 weight oils, such as Castrol GTX and Shell Rotella are OK. You can also buy motorcycle specific oils, but they are generally over priced and no better than Castrol/Rotella. Change the oil every 1,000 - 1,500 miles. It takes 1.6 quarts of oil. The oil level is measured with the bike level and the dipstick unscrewed and just resting on the threads.

If you don't know when the valve clearance was checked, do it know. They should be checked every 4,000 miles. See this thread for the simplist way to do it. https://www.hondarebelforum.com/f28/...ent-33874.html

Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #6 of 8 Old 08-29-2019, 11:10 AM Thread Starter
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Thank you so much. This makes so much more sense! Ill have to buy a new Petcock then because it is leaking a lot of gasoline. And ill probably have to have the carburetor cleaned since this is what most likely caused the leakage. Thank you!
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post #7 of 8 Old 08-29-2019, 01:23 PM
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The carburetor won't cause the petcock to leak. The petcock may only need a new gasket, which still available online or from a Honda stealership. See here: https://www.cheapcycleparts.com/oemp...d476/fuel-tank

If the engine is running well, the carbs probably don't need to be cleaned.

Not sure how the previous owner has the petcock set up, but from the factory, the 450 came with a vacuum activated petcock. Fuel doesn't flow until the engine starts. If you need to replace the petcock, the 250 petcock will work but is gravity flow, not vacuum.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
Here's how: https://www.hondarebelforum.com/f19/...re-121087.html
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post #8 of 8 Old 05-23-2020, 01:25 PM
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This thread has some good information for a newbie. My recommendation is to re-read it several times till you learn, and follow the important advice.
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