1. Mikuni Bst 31 Carburetor

Mikuni Bst 31 Carburetor

CV Carb Tuning from the Mikuni CV Carb Tuning from the Mikuni Manual Follow steps in order: 1. Top end (full throttle / 7.5k to redline) - Best Main Jet must be selected before starting step 2! Select Best Main Jet to get the best, most even top end power (full throttle/after 7500 rpm), select the main jet that produces the highest top speed / pulls hardest at high rpm: a.

If the bike pulls harder at high rpm when cold and less hard when fully warmed up, the main jet is too large. Install a smaller main jet and retest until you find the main jet that pulls the hardest at high rpm when fully warmed up. This must be done first - before moving on to the other tuning ranges. If the bike doesn't pull well at high rpm when cold and gets only slightly better when fully warmed up, the main jet is too small.

In order to properly tune the midrange and low rpm carburetion, THE MAIN JET MUST FIRST BE PROPERLY SELECTED after 10 to 15 minutes of hard use! Do not pay too much attention to the low end richness when you are changing main jets - you still need to be using the main jets that produce the best power at high rpm. You will deal with the low end / cruise later - after step 2. Midrange (full throttle /5k-7k). Select best needle clip position to get the best power at full throttle / 5k-7k rpm, after you have already selected the best main jet: a.

If the engine pulls better on a full throttle roll-on starting at.

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