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UTC

Lurker
Vespa ET4 (2001)
Joined: UTC
Posts: 2
Location: Herefordshire
 
Lurker
Vespa ET4 (2001)
Joined: UTC
Posts: 2
Location: Herefordshire
UTC quote
Hi first time on here so be gentle with me,

I have a problem with my ET4 the rear tyre keeps going flat when I'm riding it, I've been to the garage and had the tyre and rim checked for leaks and nothing, I live about 15 miles away from city and by the time I'm about 3-4 miles in its completely flat and impossible to ride safely!

Any ideas?

Thank you!
@der_blechfahrer avatar
UTC

Molto Verboso
ET3 & PX150 & GTS 300 Super Sport MY23 & Yamaha Neo's electric
Joined: UTC
Posts: 1881
Location: Berlin
 
Molto Verboso
@der_blechfahrer avatar
ET3 & PX150 & GTS 300 Super Sport MY23 & Yamaha Neo's electric
Joined: UTC
Posts: 1881
Location: Berlin
UTC quote
Replace the valves. The stems could be porous. (Is that the right word?)
@greasy125 avatar
UTC

Sergeant at Arms
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: UTC
Posts: 14966
Location: The state of insanity, SoCal
 
Sergeant at Arms
@greasy125 avatar
Weird 80's Vespas & Cool Vintage Lambrettas
Joined: UTC
Posts: 14966
Location: The state of insanity, SoCal
UTC quote
First of all, clean everything up. The rim, tire and all that mess. Like squeaky clean so you can see if there is any defects or problems.

Then, inflate the tire to 30-40psi and spray some soapy water on the bead, rim and valve stem.

Look for bubbles. Rotate the rim and tire as necessary.

Find the culprit and replace as necessary.

I'm gonna put my money on a valve stem or a dirty rim not allowing the bead to seat.

-g
@treppenwitz avatar
UTC

saggezza di scala
2009 'Burma Shave' Red GTS 250ie
Joined: UTC
Posts: 7060
Location: Israel
 
saggezza di scala
@treppenwitz avatar
2009 'Burma Shave' Red GTS 250ie
Joined: UTC
Posts: 7060
Location: Israel
UTC quote
greasy125 wrote:
First of all, clean everything up. The rim, tire and all that mess. Like squeaky clean so you can see if there is any defects or problems.

Then, inflate the tire to 30-40psi and spray some soapy water on the bead, rim and valve stem.

Look for bubbles. Rotate the rim and tire as necessary.

Find the culprit and replace as necessary.

I'm gonna put my money on a valve stem or a dirty rim not allowing the bead to seat.

-g
ESPECIALLY the valve stem and the pin inside. I've had two incidents exactly as you described and each time it was a poorly seated / defective valve stem assembly.

Oh, BTW, shalom and welcome from Israel!
@old_as_dirt avatar
UTC

Veni, Vidi, Posti
2007 GTS
Joined: UTC
Posts: 22556
Location: Harriman, Tennessee, Tn
 
Veni, Vidi, Posti
@old_as_dirt avatar
2007 GTS
Joined: UTC
Posts: 22556
Location: Harriman, Tennessee, Tn
UTC quote
also could be the valve stem needle inside is loose and just needs a little tightening.
@judy avatar
UTC

World Traveler
2007 LX150 Daring Plum Leonardo Da Vespa
Joined: UTC
Posts: 29304
 
World Traveler
@judy avatar
2007 LX150 Daring Plum Leonardo Da Vespa
Joined: UTC
Posts: 29304
UTC quote
Aloha and welcome to the forum from Hawaii. What the guys said and when your get it fixed throw some Ride On in there. I and the rest of the gang over here use it in all our tires. Good luck
@david_masse avatar
UTC

Ossessionato
2016 Vespa GTS 300 i.e. ABS sold, 2010 Vespa GTS 300 ie Super (sold) & 2003 Honda Shadow VT750 ACE (sold) & 2006 Vespa LX150 (sold)
Joined: UTC
Posts: 3196
Location: Toronto (formerly Montreal)
 
Ossessionato
@david_masse avatar
2016 Vespa GTS 300 i.e. ABS sold, 2010 Vespa GTS 300 ie Super (sold) & 2003 Honda Shadow VT750 ACE (sold) & 2006 Vespa LX150 (sold)
Joined: UTC
Posts: 3196
Location: Toronto (formerly Montreal)
UTC quote
Welcome to MV from the Great White North!

Sounsd like the gang has you covered.
@motovista avatar
UTC

Veni, Vidi, Posti
GT 2.4
Joined: UTC
Posts: 9032
Location: Watts, Cherokee Nation
 
Veni, Vidi, Posti
@motovista avatar
GT 2.4
Joined: UTC
Posts: 9032
Location: Watts, Cherokee Nation
UTC quote
Given the age of your bike, it could be that the rim has corroded to the point it won't bead anymore. In which case, you have to either get a new rim or put a tube in, which is good until it goes flat, because they do that fast.
What's been said so far is good advice. Clean the rim and tire where they meet. You can then coat the bead area of the tire with a light coating of dish soap and Inflate it to 50-60 lbs to seat the bead, make sure the bead is seated evenly around the tire, make sure the valve is tight in the stem, and then spray it down with soapy water. You will find out where the leak is. If you don't, spray the rim down too, and look for air bubbles. It's rare, but I've seen rims break down to the point air was leaking through them.
@dannyh avatar
UTC

Resident Gentleman
--------2008 LX150-------- Sold
Joined: UTC
Posts: 5045
Location: Brady, TX
 
Resident Gentleman
@dannyh avatar
--------2008 LX150-------- Sold
Joined: UTC
Posts: 5045
Location: Brady, TX
UTC quote
I don't really have any better advice than what's been given, but

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