Most likely... are you in Europe?...
Many Savages there, have a #125 main jet...
I think this to restrict power for graduated licenses...
Not certain...

Ah.. mmm...no! The late european Savages (I guess from '96 to 2000) had 125 main jets due to exhaust emmission regulations. Some other minor changes took place (power reduction in 2nd and 3rd gear working on carb and ignition timing).
Other changes were not made, concerning the carburetor.

Power restrictions for beginners licenses were made in europe, especially Germany, through a piece of tube to restrict the full way of the slide (positioned in the spring which holds the slide down). This does not mean the bike has not a full response on the throttle. Only missing some little hp's! (27 hp, due to a beginners insurance class)

I guess, something is wrong in the carburator. maybe sticky slide or a clogged main jet. Another possibility is an issue the engine taking unwanted air via the vacuum operated pet thingy system.

The posted symptoms in my opinion are pointing towards insufficient fuel to the engine on full throttle.

Check the vac system and also check tightening of the four small bolts holding the diaphragm backwards the petcock.

Or are there any changes or modifications made to the muffler or air filter?

If the object is simply to go fast, trade the LS650 for a faster bike. It will be much easier, and probably cheaper in the long run. Even a 250 Ninja is faster, and you can go up from there.

It's no help Renegade, but in New Zealand all our new S40s have a sticker to say that the ignition system complies with some Canadian emission standard, we even get two handbooks, one in English and one in what I assume is Quebecquois??? I brought mine new in 2010. Manufacturers plate says made in 2008. I'm wondering whether we didn't get a job lot of Canadian ones when the GFC hit. I have had the bog down problem and am running stock.

Make sure the spark plug is snug. Slightly loose plugs can cause problems. Weird, I know, but it happens and it's easy to check.  

Well, i believe the spark  plug is nice and tight just put it in and had a white flake on it (i'll have to read spark plug in tech again to see if thats good haha)... just fixed a leak coming from the cam chain cover did the plug/cap and its been running better and changed the oil (rotella t with a booster) all leaks have dissapeared now   (Hopefully i didnt just jinx myself) I'll deffinatly double check the rubber boot on the carb and the only thing i have done is put a crank case breather filter on the tube that usually goes to the air filter housing, and put a fuel filter on the fuel line that goes into bowl. I also screwed with the AFM its about 2 3/4 to 3 turns out. oh yes and moved up the slide needle to the bottom knotch so i believe thats the equivilant of the "white spacer" mod (while i took apart my carb for a good cleaning.) and J C you dont think the exhaust and cone filter would help?

Charon wrote on 09/06/12 at 17:28:59:


not really an assistant post... If there's an issue with the bike, ah, just buy another one. Next owner of this boggy and buggy bike can aks for help here  

If there is a problem, it can be fixed. I wouldn't trade my Savage's for some random other bike. I do not need to go fast, but the promised power should be there on call. If not, something is wrong. And that could be a point of a serious damage one day.