Honda CB750 Sandcast

General Category => General Discussion => Topic started by: 4pots1969 on April 29, 2018, 04:34:55 am

Title: Curious cam chain tensioner...
Post by: 4pots1969 on April 29, 2018, 04:34:55 am

Who has already seen this cam chain tensioner left in the photos?
Is it a very late tensioner or a part of the parallel market?
Thanks ;)

Title: Re: Curious cam chain tensioner...
Post by: Steve Swan on April 29, 2018, 11:02:58 pm

Gerard, very curious indeed!  Hope someone will have some ideas !

Title: Re: Curious cam chain tensioner...
Post by: acruz on April 30, 2018, 06:36:48 pm

The left one has lots of small circles, are these from casting?

Title: Re: Curious cam chain tensioner...
Post by: Nap Bollemeijer on May 01, 2018, 07:03:13 am

Those marks seem to indicate extractor pins used for die-casting, there all over plastic parts as well if you look careful.

Title: Re: Curious cam chain tensioner...
Post by: 4pots1969 on May 02, 2018, 04:25:56 am

Yes indeed, very good remark !!

Title: Re: Curious cam chain tensioner...
Post by: Nap Bollemeijer on May 02, 2018, 07:25:40 am

For the same reason the "gap" is filled because otherwise you need a more difficult mould to be able to make the gap.

Title: Re: Curious cam chain tensioner...
Post by: 4pots1969 on May 02, 2018, 08:33:39 am

The "gap"... What is it?

Title: Re: Curious cam chain tensioner...
Post by: Nap Bollemeijer on May 03, 2018, 09:21:42 am

I mean the flat middle spot on the top picture left, instead of the lowered right one.