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Converted Duc
Biondino
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PostSubject: Valve clearance   Thu Sep 21, 2017 4:09 pm

Gent's,

I note that Beetle maps run best with specified valve clearance of 1mm & 1.5 mm (4thou & 6thou). My question is are these the standard settings a MG mechanic would use on a rollerised GRiSO? Or do we have to specify them when getting the bike serviced?
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Pete Roper
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PostSubject: Re: Valve clearance   Thu Sep 21, 2017 4:25 pm

Various gaps have been specified over the years and most people don't think about what they are trying to achieve with them or why and how they change. The general, if it is thought about at all, choice is the widest settings quoted. This is based on the assumption that they will close up with heat. In fact the opposite is true.

The 8V is very sensitive to valve clearance changes. All the Beetlemaps are built for 4&6 sure they will run at 6$8 but sub-optimally.

Pete
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beetle
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PostSubject: Re: Valve clearance   Thu Sep 21, 2017 4:30 pm

Specify!

But don't say 1mm & 1.5mm. Say 0.1mm & 0.15mm.


Twisted Evil
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Fra Cristoforo
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PostSubject: Re: Valve clearance   Thu Sep 21, 2017 7:19 pm

1mm and 1.5mm?

tackitty - tackitty - tackitty
like the tracks on a dozer in the desert
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Converted Duc
Biondino
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PostSubject: Re: Valve clearance   Thu Sep 21, 2017 9:58 pm

Oops placed the . in the wrong place Embarassed
That is what happens when you grow up with imperial and change to metric half way through school.
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PostSubject: Re: Valve clearance   Fri Sep 22, 2017 8:39 am

Just to confound things, the 4 and 6 thou are for GRiSO but the Norge is still 6 and 8 thou?

Mine runs fine at stock settings with Mark's map.

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2highlander
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PostSubject: Re: Valve clearance   Fri Sep 22, 2017 11:17 am

Since 2015 Guzzi specifies 0.15 and 0.2 for flatties and rollers whereas 0.1 and 0.15 which I use for beetle maps didn't hurt so far.
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PostSubject: Re: Valve clearance   Fri Sep 22, 2017 4:17 pm

Don't be confounded Greg. There's a very good reason for that. Get me drunk one day, and I'll tell you.

drunken
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