I need help adjusting the idle on a volvo penta 135. It's on a 1997 17' horizon 190 by four winns. I'm not really a mechanic but can want to know if it is a easy fix or am I opening up a can of worms. Anybody have a clue how to do this? Thanks in advance mike

Hi,
A first being asked about a stern-drive boat engine, but as luck would have it; Volvo is one of those responsible manufacturers that make their manuals public. Find it at:
http://vppneuapps.volvo.com/ww/PIE/ViewFileFrame.aspx?n=34202&r=2005-01-19-18-12-26&t=PDF&a=7740979&p=T403&d=Owners Publication&s=19124176&lang=en-GB
And the maintenance schedule at:
http://vppneuapps.volvo.com/ww/PIE/ViewFileFrame.aspx?n=175893&r=2006-07-19-05-10-40&t=PDF&a=7746948&p=T423&d=Maintenance Schedule&s=51285&lang=en-GB
But note that these can be large documents and can be time-consuming to download.
I might point out that if this has started to die because the idle has become to low that this is symptomatic of other service needs.
Peace,
Clarke