BurnPgh
Serious Thumper
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SuzukiSavage.com Rocks!
Posts: 1732
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well tuned can mean a lot. You can tune for low end, peak HP, high MPG, etc. I assume you mean how can you be sure your carb is tuned properly. Only way to really do that is check your plug at idle, midrange, and WOT. If you're stock and properly tuned you're lucky. Idle for a few minutes, then check your plug (and all that that process entails). If its white you're lean, adjust idle mix screw and/or go up one jet size. If its black you're rich, adjust idle mix screw and/or go down one jet size. Idle a few more minutes, check the plug again. Etc until the plug is a light brown. For mid range (after you've got the pilot circuit right) run around a few miles. A short distance from home (or where ever if you want to bring tools) get in 2nd or 3rd and twist the throttle to 1/2 and run at a steady 1/2 throttle for 5-10 seconds. Simultaneously pull the clutch lever and hit the kill switch, then coast to home or where ever and check your plug. Again, white = lean, black = rich. If you're lean shave down the white needle spacer or replace with 4 or less #4 washers. Check your plug each time you make a change and adjust accordingly. If you're rich (on a stock machine) you'd be the first. IF that is the case, add a #4 washer and check your plug. Keep adding or removing space and checking your plug until the plug is light brown. Main circuit...get in 3rd-5th and run at WOT (after you've got the pilot and needle spacer/midrange right) for 5-10 seconds and simultaneously pull the clutch lever and hit the kill switch. Check plug. Lean, go down one size on the main jet. Rich, go up one size on the main jet. Once you think you've got it right...start at the bottom and do it all over again. After the second run through you'll be dam near perfectly tuned. Yes...its a super tedious PITA.
For more info on the air mix screw, white needle spacer, and jets...just search. Links and answers are everywhere. For a stock or near stock bike buy a jet set from Lancer. Has everything you need to do the above and get it right.
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