Consistent loss of air pressure | GTAMotorcycle.com

Consistent loss of air pressure

axian_rider

axian_rider

Well-known member
Hi all,

Just got my bike this year, and have some issue with the air pressure for my tires


I have been riding the bike (2007 ninja 250) for the past 3 months. But I didn't decide to check my air pressure until about 2 days ago, cuz the tire looks fine. And to my surprise, the gauge shows 0 psi. I checked the gauge in the tire of my car and it was working fine.

So I go on and pump air into it, reached about 35 psi (tire was cold). Then took off to work. When I check the pressure again this morning, it's only 30 psi (cold tire).

Is it possible that I have a minor leak? Or is this normal?


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Check the valve stem, if that's okay it's time to look for a nail or screw in the tire.
 
Use soap and water and spread it over the tire, look for bubbles. Most likely is/was a nail in the tire. Once you find the problem ask us how you can fix it.
 
thank you all, I'll take a look.

However.. this might sound a stupid question... but what's the valve system? and what/how do i check?

Scudzo_2 said:
Check the valve stem, if that's okay it's time to look for a nail or screw in the tire.
Click to expand...
 
axian_rider said:
thank you all, I'll take a look.

However.. this might sound a stupid question... but what's the valve system? and what/how do i check?
Click to expand...

Valve stem is where you're putting the air in :p ... it is pretty common to leak from it or around it.
 
yeah, check if it's leaking out of the stem, or around it, could just be a stuck valve core (part inside the stem, easily replacable)
 
Thanks for all the help.

So I did the soapy water test this morning, but see no bubble. While I check the pressure, it dropped around 5 psi again. So looks like it is consistent of 5 psi a day.

I've also checked the rear wheel as well, same 5 psi lost a day, but I didn't get to do the soapy test on it.

Any ideas? Or should I spray again to double check?

Thank you all for your help!


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spray again, the air is getting out somewhere. Make sure you check around the valve stem, around the valve core (remove the dust cap first), where the tire and rim meet (the bead) and if that all turns up negative start checking the sidewalls and the tread for leaks. How old are these tires? Are there any cracks in the rubber?
 
Spray the valve with soapy water and move it around in a circular motion. I've seen many were they don't appear to be leaking at a stand still but leak when the tire is spinning and valve is being affected by the centrifugal forces.
 
Are they original tires? If so then there may just be small cracks allowing air to escape.

However with a tpg reading 0 I'm surprised you didn't see/feel the tire deforming
 
meme said:
Are they original tires? If so then there may just be small cracks allowing air to escape.

However with a tpg reading 0 I'm surprised you didn't see/feel the tire deforming
Click to expand...

I am just as surprise. It doesn't look deflated at all, unless it would look differently from a car tire. What prompted me to check was because the turning felt a little off, but visually it was ok. I'm gonna check again later on today or tomorrow.

The tires aren't original. I got the bike second hand, but the tires were referred to as "new", and the marking on it suggested so as well.


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sometimes there can be a leak around the bead. where the rim meets the tire. inspect the whole tire for any punctures as well.
 
I don't lose 5 pounds over the winter so you have a problem. Once I was losing a pound a day and found the leak with soapy water. It was a nail.
 
You can also check the tire mounting within the rim itself. Sometimes dirt are trap in those area upon installing the tire. Another thing is to fill up your tire with nitrogen instead of regular air. It will last longer and keeps the pressure cool even with extreme riding.
 
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