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 Roller tappet kits

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Steve Waller
Carlotto
Carlotto


Posts : 32
Join date : 2014-07-30

PostSubject: Roller tappet kits   Tue Jan 05, 2016 4:28 am

Can someone (Pete?) provide some definitive advice on the difference between the A, B and C kits that are available for upgrading to roller tappets?

I understand that the C kit is for earlier four valve heads where the head needs to come off to shim the valves. However, not quite so clear on the difference between the B and A kits. I have a 2011 Stelvio which I believe needs the A kit. However, the B kit is quite a bit cheaper and the only difference I can see seems to be the provision of a seal for the spark plug hole in the rocker cover.

Cheers
Steve
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Pete Roper
GRiSO
GRiSO


Posts : 3783
Join date : 2013-05-29
Age : 59

PostSubject: Re: Roller tappet kits   Tue Jan 05, 2016 7:08 am

'C' kit consists of three sets of head gaskets, inlet and exhaust manifold gaskets, rocker cover gaskets and tampons, shims for the inlet valve spring seats and o-rings for the rocker covers as well as the new camboxes and assorted hardware.

'B' kit contains just camboxes and hardware plus rocker cover gaskets, o-rings and tampons. None of the gaskets required for replacing the heads after shimming and no shims.

'A' kit is the same as the 'B' kit apart from the fact that the camboxes are machined differently with th an o-ring groove at the bottom of the plug tunnel to accomodate the short tube used on later engines and the thicker neoprene gasket that seals the cambox to the rocker cover.

Your bike being a 2011 most likely requires a 'B' kit. The way to check is to look for a drilled 'Dot' in the paint on the inner face of the head next to the manufacturing date stamp and whether the plug tube is sealed by an o-ring or the later gasket. The dot in the paint indicates the valve Spring seats are already shimmed.

Pete
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Steve Waller
Carlotto
Carlotto


Posts : 32
Join date : 2014-07-30

PostSubject: Re: Roller tappet kits   Tue Jan 05, 2016 7:25 am

Thanks Pete, much appreciated as always.
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Pete Roper
GRiSO
GRiSO


Posts : 3783
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Age : 59

PostSubject: Re: Roller tappet kits   Wed Jan 06, 2016 1:06 pm

Quick way to check.

If your rocker cover looks like this you need a 'B' or 'C' kit.
[You must be registered and logged in to see this image.]

if it looks like this it needs an 'A' kit.

[You must be registered and logged in to see this image.]

To work out if it needs a 'B' or 'C' kit you need to check the heads for the dot in the paint.
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Street
Nibbio
Nibbio


Posts : 891
Join date : 2013-05-29
Age : 57

PostSubject: Re: Roller tappet kits   Wed Jan 06, 2016 2:55 pm

So, if it has a severed fingertip, it needs a "B" or "C" kit?
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Bill Hagan
Sfregiato
Sfregiato


Posts : 468
Join date : 2014-07-03

PostSubject: Re: Roller tappet kits   Wed Jan 06, 2016 4:18 pm

Street wrote:
So, if it has a severed fingertip, it needs a "B" or "C" kit?

You owe me a new laptop, as mine is now covered in spewed beer.   Very Happy

Kathi -- who humors me, but usually isn't that amused by stuff I point out here or elsewhere -- had a similar reaction. queen

Bill
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Street
Nibbio
Nibbio


Posts : 891
Join date : 2013-05-29
Age : 57

PostSubject: Re: Roller tappet kits   Wed Jan 06, 2016 5:12 pm

Desired effect achieved! Cred for me!
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Oz1200Guzzi
Don Abbondio
Don Abbondio


Posts : 1783
Join date : 2014-03-13
Age : 62

PostSubject: Re: Roller tappet kits   Wed Jan 06, 2016 5:29 pm

Yup, more cred Pete +1
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PostSubject: Re: Roller tappet kits   Today at 7:58 pm

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