All the videos on changing a scooter valve stem are similar, and all very helpful. For me, the Harbor Freight bar clamp I had stopped ratcheting as pressure was reaching its maximum, and it still hadn't uncovered the inner surface of the valve stem. As I was afraid that this flimsy clamp's mechanism might break, and worse, that the bar clamp would be stuck on the tire, I removed it and tried a different type of clamp I had. (I had also previously tried two large C-clamps but couldn't get that to work either.) What worked really easily for me was using a large wooden handscrew clamp, the type with two wooden jaws and two threaded rods to adjust the jaws. I used a wooden block (flooring sample from Home Depot) on one side, held by the clamp against the rim, and then tightened the jaw of the clamp just below where the valve was. No problem at all. I couldn't remove the old stem with a screwdriver or small pry bar, so I cut it off from the outside of the rim with a pair of diagonal pliers and pulled it through. I applied soapy water to the rubber of the new valve stem, inserted a #2 Phillips head screwdriver inside it to contact the metal part, and seated it in place with a few taps of a rubber mallet against the handle of the screwdriver. I used a bicycle foot pump to gradually inflate the tire until it popped into place on the bead, then continued inflating to full pressure. All in all, a very satisfying experience to be able to do this myself. My scooter dealer wanted $128 to do this, but it only cost me $8 total for two (angled) brand new valve stems.

Your trick did it for me, on a much wider tire, which was tricky. Getting the stem in place wasn't easy, pliers are definitely needed. Tip: add strips of electrical tape to the rim to avoid scratching it, especially when using the pliers. You forgot one very important step: you need to use soap-water in order to properly seal the bead. Simply apply a very soapy solution around the bead with your fingers, make it nice and wet. Dish soap is perfect for this. Thanks for the vid, helped a lot.

I already had this idea to try except I was going to use a C-clamp but my front tire is old and I was afraid I would damage my tire. (I am going to replace it in a few weeks but I need the scooter now) So, I saw your video and then ran to Harbor Freight and bought a 12" bar clamp like yours for $3.99. I just completed installing my new valve and from start to finish it took 6 minutes or less! I wanted to thank you for your brilliant suggestion of using the HF clamp. It is PERFECT for this job and now I will have it around for other jobs too. Thank you so much. No tire damage at all because those rubber feet on this clamp are just right.

Great video make more please. Very straightforward straight to the point that's what I like.

Old post but I’m glad this was here! I was riding TO work and the front valve stem started leaking rapidly. I rode probably 10 miles on my bike flat. I thought my steering head bearing went loose when it happened. I mean, in 40 years I’ve never had a front flat. Aired the tire up at work ( I carry a battery powered air pump from Walmart and a tire kit in the saddlebag of my 2021 Kawasaki Versys 650.) Seemed to hold air until I left work at 8pm that night. Almost instantly it went flat. I stopped about halfway home (25 mile ride!) filled the tire. No real help. Basically rode home doing 60 mph leaning to the back of my bike. Some people might think that speed is crazy but the slower you go the less stable the bike. Coming to a stop is a knuckle biter! Went to Harbor Freight next day and bought three of those clamps just in case. Tried last night but couldn’t seem to break the bead. This morning I thought I’d give it another try and use three clamps… POP! I think the hardest part was getting a socket on the back of my new valve stem. Just rode the bike. Holding air. No damage to the tire! No damage to the rim because even though I was going fast I was very careful around turns. It’s a bit out of balance. The bars shake a bit at low speed. But I have Ride-On in my tires so I’ll just add some. Probably lost some or it dried out riding home on the flat. Thank you for the video. Saved me a couple hundred dollars.

What a great hack! I just changed my stem on my honda metro in 5 mins

Brilliant idea! Harbor Freight Tool, here I come~!

Thanks man!

My tires a tube tires but I want to go tubeless and this video helped me out.

Excellent

Worked for me on my 1800 Goldwing but had to initially use an 8" C clamp to break tire rim seal. Afterwards the two flimsy Harbor Freight clamps did the trick.

Cool video. I have a rotton stem on the back tire of my yamaha R1. Not a scooter but this is good info. Thanks

Thank you its very smart your video was very helpfull , My tire 120/70 R 17 I use a 4 inch clamp I use a rubber valve at the end i pulled it with vicegrips and click no problems

Great hack, just tried and completed it this morning... had to use 2 clamps to break the seal.

Kman you're a genius thank you! The best hack I've seen for this job on the web.

I just picked my tire up from the repair shop, they charged me 75.00 for this. To bad I didn't think of researching it before I took it to the shop.

what brand rim stem do you use?

Thanks for the video, I was told by “Canadian Tire” staff my electric scooter 🛴 Navee N65 valve was the issue for the flat. How do I measure the valve to order the right size? - my operators manual gives me no measurements for my scooter valve; it’s only 6 months old - (annoying)!! Thanks so much😊

do what i did i rod it home on flat slow soon as i when to make a turn into the naborhood the beed broke off i almost crashed but i know it was comming so i had both feet down to catch myself befor it almost crashed sidwas then i got off it gave it little gas to walk it home eazy cus my house was right on the corner but i had no strap so oldschool with rope and a tool twisted the rope in the took for a seal and we good

@kman auto what size is your clamps

I haven't been able to find those stems - where do you get them? Great video - thanks!

What scooter is that?

Dude! you have a Cacoon dangling from the rear of your front fender!

hi, does the front wheel need to be lifted to do this? I tried using a clamp to do as you did but since the tire is flat and sitting on the ground, I think that is preventing me from squeezing the tire enough to break the bead.

I don’t know what size to get

Can i just inflate the tire after this and ride?

@KMan Auto will the stand/lift you're using work on motorcycle's and if so what is the name of the brand you used or what kind should I get for my crotch rocket front and rear stands or the one your are using

who makes that 90 degree stem?

If you don't break the bead, you can damage the sidewall clamping it. Ask me how I know. 😅

Weird a trailing front axle

@Kman Auto I have a crotch rocket so do you have to have motorcycle stands in order to do this

Why did the guy at the tire shop tell me I have to get a new rim and he was totally stumped as far as replacing a valve?

Tried this with motorcycle. Did not work

Yo mo videos

Problem is the bead will never set unless you have a super powered compressor.