Not sure i think the final drive ratio is around 3 to 1.  Thats 23 and 68 on the stock savage final drive i think  Or something like that.  You csn count the teeth on the sprockets to find out for sure.  Too bad the bike doesnt have a tach.   You could go out and do some experimenting to figure Out what you like.  Just remember that for increase in speed you get an equal decrease in torque.  So your off the line performamce suffers.

Heres a link with it all layEd out
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1174239333/7#7

Looks like a 17 and 43 or 45 can give a decent decrease in rpms.

Ut depends on your pulleys not on your transmision.  As long as you have the same ratio pulleys as the ones on the 5 speed it will give you the same %age increase or decrease in speed.  I think your going the wrong way with a 50 tooth gear.  You want a lower ratio for more speed a higher ratio for more torque.  At 17 and 50 youd have a 2.94 ratio which is about stock for a 5 speed and if the 4 speed has the same pulleys it will not change your speed at all.  A 52 gear would be a 3.06 and would actually increase your rpms at speed.  If you want to make sure count the teeth on the front and rear pulley and divid.  This is your finak drive ratio.  Say you want to get a 10% reduction in rpms then take that number and multiply by 0.90.  This is your new desired ratio.   Using a combination of the front gear 14-17 and tge back gear 40-60.  Find a combination that meets the ratio requirement.

james may wrote on 01/19/11 at 06:14:58:

as soon as i read this i wanted to smack myself. my brain must be on timeout or something. thank you very much for digging to check part numbers and giving me the calculations to check ratios. very cool of you , thanks again!