whistling engine sound of PX125
Post Reply    Forum -> Not-So-Modern
Author Message
Hooked
61 Gs150 vs5 , 55 Acma125, 62 Gs160 mk1, Lambretta TV200
Joined: 15 May 2010
Posts: 113
Location: korea,south
Sun Oct 11, 2020 10:30 am quote
Hi guys,
I just rebuilt a PX125 engine
All bearings except clutch crank bearing were replaced.
All seals were replaced.
New clutch discs,
oversized piston & cylinder. (new piston)
the gudgeon pin bearing was not replaced.
crank was not replaced.

But it makes some whistling noise..that I feel not normal..
Someone told me that the con rod could have a problem.. So I just attache a video piston working..

I don't know how to insert the youtube video here..
https://youtu.be/p2MgTl3iKBc
https://youtu.be/h5EwlNnOMdo

Does anyone know what happened to it?
I already split this engine twice.... hope no more split it again.. lol
Thanks!

KakaoTalk_20201005_002623488_09.jpg

KakaoTalk_20201005_002623488_06.jpg

Addicted
Old douglas ..smallie with polini 115..super with nasco 177
Joined: 07 Nov 2013
Posts: 620
Location: New Zealand
Sun Oct 11, 2020 12:34 pm quote
maybe?
flywheel cover slightly bent and rubbing on flywheel is most likely

.....and not sure....in your pic is the oil scavenger plastic bit up the correct way ?

good lucki
Hooked
61 Gs150 vs5 , 55 Acma125, 62 Gs160 mk1, Lambretta TV200
Joined: 15 May 2010
Posts: 113
Location: korea,south
Thu Oct 15, 2020 10:23 pm quote
Re: maybe?
Bluecati wrote:
flywheel cover slightly bent and rubbing on flywheel is most likely

.....and not sure....in your pic is the oil scavenger plastic bit up the correct way ?

good lucki
Thanks!
Addicted
'64 Motovespa 150S (177) , '66 Allstate SF, '64 VBB, '66 180SS
Joined: 27 Mar 2013
Posts: 755
Location: S.Salem, NY
Fri Oct 16, 2020 1:44 am quote
I doubt that the crank is the source of the noise. Even if the bearings were dry or the con rod was rubbing the web, I doubt you would be able to hear it.
Pop the FW cover off and see if the noise goes away but you know it needs to be there for cooling the cylinder so you don't want to run it very long. You could look at the inside and see if you notice any contact wear marks.
The plastic scavenger can't be installed any other way.
Maybe not a big deal, but you should pop the circlip off the axle and flip it around so the sharp edge is facing out. Generally, with circlips, the load should be against the sharp side. You'll see what I mean when you take it off.
Addicted
'64 Motovespa 150S (177) , '66 Allstate SF, '64 VBB, '66 180SS
Joined: 27 Mar 2013
Posts: 755
Location: S.Salem, NY
Fri Oct 16, 2020 2:15 am quote
Please excuse me... Obviously, you are not going to open the case to flip that clip, but you might keep this in mind in the future.
Missouri Loves Company Rally   vespa scooterwest scooter west Motorsport Scooters   Cool Ass scooter seat cover
Post Reply    Forum -> Not-So-Modern
[ Time: 0.1493s ][ Queries: 27 (0.0411s) ][ Debug on ]