Is 0.5 psi loss on rear tire in 48 hrs ok? - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 8 (permalink) Old 07-24-2016, 08:56 AM Thread Starter
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Is 0.5 psi loss on rear tire in 48 hrs ok?

'05 800, I gave the shop my front and rear wheels and the Michelins had them do the swap, they reused both tubes and I think they are OEM tubes because the rear I am checking now has the 90 degree metal stem, so this was a few month ago and they set the pressure on the rear at 35.5 psi. So 2 weeks I used one of my expensive digital tire gauges to check pressure on the rear and it was at 35.5, then a couple days later I was about to go for a ride and the rear was completely flat as a pancake, so I thought bad valve stem? hole in the tube? but the psi was fine on the rear for 2 months after shop did it so can't be a hole in tube, so I thought it must be either the valve stem or that digital tire gauge I used, so I replaced the valve stem with a new one, and also I checked over my digital gauge and noticed the metal pin on it that pushes on the valve stem was out of line and loose, so I bought a new pressure gauge, pumped up the tire and checked it on Friday using this new gauge and I put 35.5 in the rear, today I checked it again (not using my expensive digital gauge anymore) and it's at 35.0 just now, does that sound like I got a leak? or should I wait a few more days and check it again. I have a sense that my expensive digital car tire pressure gauge I bought off ebay has bit the dust and is broke and side-swipped the valve stem pin to remain out of line enough to let out the air. Dunno what happened.

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post #2 of 8 (permalink) Old 07-24-2016, 09:56 AM
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Tire pressure changes with temperature. I wouldn't be concerned just yet, but I would keep an eye on it. On average, you lose about 3 PSI/month. That's considered normal. Thing to check: make sure the valve core is seated all the way. If they aren't tightened, they can lose little amounts of air.

I grabbed a fistful of throttle and all my worries disappeared.
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post #3 of 8 (permalink) Old 07-24-2016, 10:08 AM
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Quote:
Originally Posted by hayes View Post
Tire pressure changes with temperature. I wouldn't be concerned just yet, but I would keep an eye on it. On average, you lose about 3 PSI/month. That's considered normal. Thing to check: make sure the valve core is seated all the way. If they aren't tightened, they can lose little amounts of air.
Did that to a friends car,took core remover and loosened up one his
took 2 days to go flat,he couldn't figure it out,I fixed it
As hayes says keep a eye on it 1/2 lb in 48hrs should'nt b a concern
Had new tires put on mine month ago and haven't even ckd pressure since
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post #4 of 8 (permalink) Old 07-24-2016, 11:17 AM
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Did that to a friends car,took core remover and loosened up one his
took 2 days to go flat,he couldn't figure it out,I fixed it
As hayes says keep a eye on it 1/2 lb in 48hrs should'nt b a concern
Had new tires put on mine month ago and haven't even ckd pressure since
During the winter, put a cup of water in the tire (easier if you're mounting them). Overnight, they freeze and cause a wicked vibration. As the tires warm up, the ice melts and the vibration goes away. It's fun to watch people try to figure out what the F is going on.

Want to talk pranks? Put 1/2 an ounce of wheel weights on their driveshaft. That's a fun vibration to try and diagnose. I recommend only doing this to people you know because you might get your ass kicked...
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post #5 of 8 (permalink) Old 07-24-2016, 11:22 AM Thread Starter
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I didn't know about the normal 3 psi loss/month, good thing you mentioned it. I checked and snugged up the new valve stem, check psi it's at 35.0, and will keep an eye on it. I like my new tire pressure gauge, bought it at NAPA and I am tossing that expensive digital one, In my humble opinion I think the depression pin on it is broken and is what caused the rear tire to go flat.

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post #6 of 8 (permalink) Old 07-24-2016, 12:24 PM
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Quote:
Originally Posted by hayes View Post
During the winter, put a cup of water in the tire (easier if you're mounting them). Overnight, they freeze and cause a wicked vibration. As the tires warm up, the ice melts and the vibration goes away. It's fun to watch people try to figure out what the F is going on.

Want to talk pranks? Put 1/2 an ounce of wheel weights on their driveshaft. That's a fun vibration to try and diagnose. I recommend only doing this to people you know because you might get your ass kicked...
Little off subject,told a newbie at work to go get a pallet stretcher
Gone for like 1/2 hour,
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post #7 of 8 (permalink) Old 08-16-2016, 01:57 PM
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Wow, while .5PSI over 48 hours doesn't sound bad, I can say that I very rarely have to add air to my tires. Typically I'm adjusting because of changes in temperature, but for instance, I let the bike sit from December (warm 60+ degree day) to March (60+ degree day again), and had 0psi lost in 4 months!

My wife's Shadow, OTOH, loses at .5psi or more per day. I feel like I'm constantly adding air to her tires. Next time she needs tires, I'm having *my* guy do it instead of whatever shop she used lol.

-John
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post #8 of 8 (permalink) Old 08-17-2016, 08:17 AM Thread Starter
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as of now, I checked my pressures again and the tubes haven't lost any air since I replaced the stem valves for new ones and began using new metal valve caps

Thunder Mfg teardrop 40's K&N 170MJ 48PJ 2.75turns DynoJet Needle DNO106 2nd notch V&H Cruzers Aeromach risers Michelin Commander IIs Wix 51358 filter 17T/40 Sprockets, 2357 rear bulbs
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