2 replies [Last post]
hooverbj's picture
VBMWMO #9255
Joined: 04/01/2017
Posts: 77

I replaced the burned out bulb in my rear tail light on my 66 R50/2. When I went to close the assemble it was struggling to go back to a nice tight fit. I proceeded to try and put the small regular screw bolt back in hoping that would tighten up everything again. But the threaded part on the tab was bending at the wrong angle and I stripped the small screw. I thought I could find a replacement at my local Ace Hardware. But it appears that a 5mm was too small and a 6mm was too big. Does anyone know what thread this screw is? or where I can find a replacement?
Brian Hoover
1966 R50/2
Cedar City, Utah

wa1nca's picture
VBMWMO #8374
Ashfield Ma.
Joined: 09/27/2012
Posts: 358
Tail light screw

Checked my parts book and other sources and found the screw is not listed by itself but is sold with the chrome ring
If you stripped the threads on the screw then most likely you also stripped the threads on the tail light housing also

I suppose you could call Vech and he would know

In the meantime you could use a screw with a nut on the taillight shell



Tommy Byrnes
54 R51/3 55 R50 64 R27 68 R69US 68 Sears Allstate 250 (Puch)

schrader7032's picture
VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6540
If you have a digital

If you have a digital caliper, you can could the number of threads over a given distance. Metric screws/bolts are listed a "mm per thread". So, if you've tried a 5 and 6mm and they don't work, it would appear that the thread size is 5.5mm per thread. There are a number of other bolts on the bikes that are this odd ball pitch. IIRC the small screw that caps off the vacuum port on my /7 carb is 3.5mm per thread.


Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

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