The consensus here is that you should check the adjuster somewhere between 10,000 and 20,000 miles.  A lot depends on how far you ride when you get on the bike.  If you take lots of short trips you should be checking it closer to 10,000 miles......if you go for hundreds of miles on each ride....then more might be OK.  Several new members recently have just caught their tensioner in the nick of time and avoided expensive damage.

Here is a link for the most information....and where you can buy the modified tensioner from Verslagen.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1180206459

Here is another link to recent discussions:

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1438534586

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1438008459

If you are worried about it then check it, you have enough miles on your bike for it to become an issue.
 My '02 was out 16mm at 10k which was just under the service limit. Put a modified tensioner in and I'm good to go except for loosing the neutral safety light on the tank.  

Press your heels against the side of the engine. If you can feel an uneven vibration between each side then the tensioner needs to be at least inspected. It should give you plenty of warning before it dies completely. It'll rattle loudly.

the solution of chain tensioner problem is not bad. but i would slightly disagree with it.
when you extend the bolt side of plunger by welding an extra piece, you are safe as far as that thing drop will drop down and damage is concerned. but you see there is a slight problem with that and i might be wrong and please correct me if i am. the thing is that the whole chain is stretched a bit, ok? the adjustment is only on one side of the chain, in the photos we can see the chain glide pushes from the left side of the chain, ok? now the problem is the whole adjustment is on one side and that itself alone throws the timing off a little. if the adjustment was on both sides, left and right equally than the timing would be fine. but pushing the timing chain way to long only on one side will definitely effect the overall timing of the engine. therefore i personally would prefer to replace the timing chain rather than pushing it twice as far as it would by modifying the plunger and extending it. in my opinion the better solution would be to make a much better quality timing chain available for the bike. otherwise replace it with the new one already available. again i would say correct me if i am wrong. i also have suzuki boulevard s40 2009 and i will post my pictures too cuz mine too needs fixing

I'm new on here and need one of your adjusters. Is your deal for the two for one still on?

ok. then it means that this modification is not suitable for boulevard s40. i actually noticed a very obvious drop in performance along with a ticking noice and i suspected the timing chain and when i opened the side cover my plunger was out to its limits although the bike has only done 10000 miles. i will also post picturesverslagen1 wrote on 08/18/15 at 13:47:11:

You know what is really weird about this?  The chain will still be within the factory wear limits when the unmodified tensioner plunger pops out!

So...if the cam chain is in spec, and the cam timing is within reasonable limits, and the bike still runs fine....shouldn't the tensioner be able to go the full distance of the chain wear?

Seems to me that Suzuki should have made a tensioner that has about twice the travel of the stock tensioner...and one that is a bit less aggressive about tightening the chain.