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My bike has been sitting tires look fine but they keep having low tire pressure a few days after I fill them to the correct psi. Is it normal for tires to lose pressure just sitting for a bit? They are older but no holes or nails and the tread looks ok. Thanks
 

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Junior Grue
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A good tire, rim and fill valve will hold air within a few pounds over several months.

I'd soap up everything to find where it's leaking.

I'll not get into using old tires as there are lots of posts here about that.:readit:
 

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some tires have a habit of slight leakage over a couple of weeks,check the tires for age cracks and check that the valve core is/isn't leaking,use a valve cap other than a plastic one,since the better ones tend to have an o-ring in them just in case the core leaks
 

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Still Learning
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The rim may have corrosion at the tire seat or just need cleaning, by removing the tire. Or it could be a leaking valve stem. Both can be checked by inserting the stem and the tire rim bead area in a water tub to check for leaks.
If the tires are more than 5 years old, there is a date code on the sidewall after the tire vin number, replace them as the rubber hardens and doesn't grip the road well and as said, you may fall down and get hurt and so may your precious cargo not to mention your bike.
Replace the valve stems too. The rubber ones sold by Honda crack and break off at the rim where they insert through the rim. Get all metal 90° stems that have a nut to secure it to the rim. There are billet aluminum stems for @$22 for 2.
Or, maybe you like playing Russian roulette? Being cheap and using old tires on the bike is like spinning the chamber every rotation of the wheel. You feeling lucky today?
 

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Oh - THAT guy...
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You can check for leaks and all that, but please check the date on the tires. It is wisest to err on the side of caution with those black donuts. On a car if you lose one you still have three points of contact-no big deal. Lose one on the bike and it could be a much bigger deal.
There are several threads about it here, but look for a 4 digit number near the rim line on the sidewall, probably in its own smoother 'box'. It might only be on one side of the tire. The first two numbers are the week of the year manufactured, the last two the year. '4108' is the 41st week of 2008. If they are over 5 years old, new tires are a good idea and while the tire is off, inspect the rim well, clean up any potential issues, and install new valve stems.
 

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You can check for rim leaks & valve stem leaks without pulling it or submerging it. Go to HD and buy some leak detector in the plumbing dept. You can also make your own with a dishwashing detergent/water mix. You'll see bubbles at the leak site.
 

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If you're still using the stock rubber valve stems, wiggle them as you spray them with windex. This will tell you if they are leaking as the tire & wheel rotates going down the road
 

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Go to HD and buy some leak detector in the plumbing dept. You can also make your own with a dishwashing detergent/water mix. You'll see bubbles at the leak site.
When did Harley Davidson get a plumbing dept?
 
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