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 Valve clearance

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Converted Duc
GRiSO Capo
GRiSO Capo
Converted Duc


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Join date : 2014-12-16
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PostSubject: Valve clearance   Valve clearance Icon_minitime1Thu Sep 21, 2017 7:09 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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Pete Roper


Posts : 9466
Join date : 2013-05-29
Age : 65

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PostSubject: Re: Valve clearance   Valve clearance Icon_minitime1Thu Sep 21, 2017 7:25 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
GRiSO Capo
GRiSO Capo
beetle


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Join date : 2013-09-30

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PostSubject: Re: Valve clearance   Valve clearance Icon_minitime1Thu Sep 21, 2017 7:30 pm

Specify!

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


Twisted Evil
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PostSubject: Re: Valve clearance   Valve clearance Icon_minitime1Thu Sep 21, 2017 10:19 pm

1mm and 1.5mm?

tackitty - tackitty - tackitty
like the tracks on a dozer in the desert
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Converted Duc
GRiSO Capo
GRiSO Capo
Converted Duc


Posts : 305
Join date : 2014-12-16
Age : 57

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PostSubject: Re: Valve clearance   Valve clearance Icon_minitime1Fri Sep 22, 2017 12:58 am

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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ecs
GRiSO Capo
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ecs


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Join date : 2013-11-11

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PostSubject: Re: Valve clearance   Valve clearance Icon_minitime1Fri Sep 22, 2017 11:39 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
Biondino
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Join date : 2016-09-28
Age : 62

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PostSubject: Re: Valve clearance   Valve clearance Icon_minitime1Fri Sep 22, 2017 2:17 pm

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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beetle
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PostSubject: Re: Valve clearance   Valve clearance Icon_minitime1Fri Sep 22, 2017 7:17 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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