This is the sixth in a series of reports intended to document the results of progressive modifications to the LS650 engine.
Part 1 outlined the project, set the rules, and established the baseline performance values for a box-stock LS650. You can find Part 1 here.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1620523526Part 2 examined the airbox. We improved performance dramatically with a few simple and inexpensive modifications. It was a lot of bang for the bucks. You can find Part 2 here.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1621150483Part 3 took a hard look at the exhaust system. We tried a Dyna muffler and a hybrid muffler (home-built). We also tried the larger Mac header pipe. The exhaust modifications provided significant improvements in acceleration and fuel economy. You can find Part 3 here.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1623048749Part 4 installed a performance carburetor and revisited the air filter. You can find Part 4 here.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1625732492Part 5 installed a new camshaft with higher lift and duration. The results were gratifying and informative. With some valve overlap, the exhaust header took on a new role. You can find Part 5 here.
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1626391255Part 6 installs a lighter flywheel. Reducing the weight of the rotating assembly should consume less horsepower, leaving more power to drive the motorcycle. We’re looking for quicker acceleration. It will also reduce the weight of the motorcycle which will provide a modest improvement in the horsepower to weight ratio.
What I am about to describe worked good for me. If you decide to try this stuff on your own, you assume responsibility for the outcome. If you don’t have the skills, don’t do it. If you don’t understand something, STOP and get help. Get a manual. Read up. Comply with ALL the safety requirements outlined in the manual. Make sure you know what you are doing before attempting any of these modifications.
Let’s get started.