"Clunk" when shaking rear tire!
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Member
180ss with moded engine
Joined: 29 Mar 2009
Posts: 24
Location: Montreal
Fri May 22, 2020 2:34 pm quote
Hi everyone, i had posted quite some time ago about my vespa feeling a bit "squirly" when going on curves.
I was in the garage before and took a look at the rear tire of my bike. i grabbed the tire at the 9-3 position and pushed an pulled on it. i could here a "clunking" noise and a slight movement in the rear hub.
i checked the bolts holding the tire (by hand) and they seemed tight. i think it might be the hub.
does the nut holding it on need to be torqued to a certain spec? should i use an impact gun? any info would be great. thanks
fab
Enthusiast
Joined: 22 Jul 2018
Posts: 73

Fri May 22, 2020 4:22 pm quote
There is a specific spec but I don't have it handy. Spent years using an impact so....




....I switched to the spec. No reason other than the spec is the spec. You do you though.
Molto Verboso
08 GTS 250, 79 P200E, 62 Allstate
Joined: 11 Jan 2006
Posts: 1554
Location: Florence, OR
Fri May 22, 2020 5:18 pm quote
Hey Chef,

55 to 65 ft lbs according to the Haynes manual. It's also here on this website: http://www.vespamaintenance.com/specs.html

Hope this helps!
Molto Verboso
Vespas 1964 GS160, 1965 SS180, 1977 V9A1T, 1983 PX150E
Joined: 16 Apr 2011
Posts: 1324
Location: Siam
Fri May 22, 2020 7:36 pm quote
Don't use an impact gun to install! There's a 99% chance the threads in the castle nut will strip. Just use a socket and a torque wrench or breaker bar extension. I've even stripped a castle nut using just a breaker bar. That's because the reproduction castle nuts are often of inferior quality. Using an impact gun to remove the nut is ok. I do that if I can't get it off with the breaker bar. As far as your "clunk" is concerned, it could be a few things. I had a "clunk" last week and found it to be old worn out motor mount buffers.
Addicted
bare metal cafe racer
Joined: 01 Sep 2017
Posts: 697
Location: Aotearoa (New Zealand)
Fri May 22, 2020 9:54 pm quote
I reckon you’d have bigger problems if either the wheel nuts or hub nut had come loose. +1 for the motor mount bushings - there is a usually clunk from that even when they are new (and needs a shim to remove completely).
Member
180ss with moded engine
Joined: 29 Mar 2009
Posts: 24
Location: Montreal
Sat May 23, 2020 2:34 am quote
Thanks gang. Will try torquing it down today.
I had read, to try (while standing on the bike) the push bike backwards and apply rear brake hard. If there is play, chances are it's the mounts. Is this a good test? If so, i did it and no play or clunk at all.
I remember changing the mounts/bushings about 15 years ago. I don't ride the vespa that much.
Fab
Member
180ss with moded engine
Joined: 29 Mar 2009
Posts: 24
Location: Montreal
Sat May 23, 2020 4:11 am quote
Update. I got my torque wrench, and tightened the castle nut down. I also tightened the bolts that hold the tire. I also checked tire pressure as it was low, according to the specs on the link shared. It was at around 25Lbs, and seeing as i weight around 205lbs, i brought it up to 37lbs/ft of air.
Clunking is much better(hardly there).
Thanks everyone.
Fab
Addicted
2016 Sprint S 150 (his), 2016 Sprint 150 Blu Gaiola (hers), 2006 GTS 250 Excalibur Gray (hers), 2006 GTS 250 Black (his), 2012 Kymco Downtown 200
Joined: 21 Oct 2016
Posts: 823
Location: Vermont
Sat May 23, 2020 5:21 am quote
Be careful on putting more air in the tire. Some will have 2 pressures. One for a solo rider and another for with a passenger. I would not exceed the passenger pressure as the tires do heat and the pressure will increase.
Member
180ss with moded engine
Joined: 29 Mar 2009
Posts: 24
Location: Montreal
Sat May 23, 2020 6:15 am quote
Okay...so what's the right pressure for a single person? (210 Lbs)
Fab
Addicted
2007 Stella 150
Joined: 02 Nov 2019
Posts: 532
Location: Rochester, Minnesota
Sat May 23, 2020 8:10 am quote
chef wrote:
Okay...so what's the right pressure for a single person? (210 Lbs)
Fab
Look for a maximum pressure on your tire. I've never seen a tire that didn't say for example. "Max weight 300lbs at 40 PSI", the users manual has no idea what tire you have, don't exceed that pressure. Going by that page it looks like you are close to being correct.
Hooked
2006 px125
Joined: 28 May 2010
Posts: 354
Location: Perth, Scotland
Sun May 24, 2020 9:39 am quote
Take the wheel off and check the hub bolts. I had something similar and although it seemed tight enough there was enough movement in the wheel to almost sheer off the hub bolts. The back wheel could easily have come off doing 60mph so very glad I caught it in time.
Also had a mate that discovered the same problem on a short run, he limped back at 20mph with just 2 bolts intact.
Member
180ss with moded engine
Joined: 29 Mar 2009
Posts: 24
Location: Montreal
Mon May 25, 2020 4:18 pm quote
Cazshai...the hub itself is new. I think that when I installed it, I didn't tighten it enough.
Fab
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