[Ducati] Re: Loose valve stems

[Dave Acey]

----- Original Message ----- 
From: "Frank Snively" <drredbeard at bresnan.net>
To: <ducati at ducati.net>
Sent: Tuesday, March 13, 2007 10:42 PM
Subject: [Ducati] Re: Loose valve stems


> Received March 13:
>
>> From: Kristy Carruba <richkri at yahoo.com>
>>
>> I am adjusting the valves on my 98 900ss/cr and
>> noticed the vertical heads exhaust valve can be
>> wiggled in it's guide. It is not by much but I can't
>> move the others as much. The bike has 13 thou on it
>> and all clearances are in spec and always have been.
>> How much movement is normal? If I need to replace the
>
> In the early '90s, Cagiva bought a bunch of defective valve guides,  but 
> they got weeded out and replaced, all too often at owner's cost  (DAMHIK). 
> <SNIP>

My 91 900SS has had both exhaust guides replaced last year @ 25000km. I got 
a pair from Guy @ MBP which will last much longer.

You might also consider having a sleeve or insert installed if you have a 
competent shop locally. They were developed to service cast iron guides but 
they work in bronze guides as well.

http://hastingsmanufacturing.com/ServiceTips/valve_guide_liner.htm

http://www.alibaba.com/catalog/10792074/Phosphor_bronze_Valve_Guide_Sleeve.html

I have one in my 350 single and no problems so far after 1000 miles and 2 
track days.

Dave