modman82
New Member
I have a modified 787 in an 96 XP that is in the process of being broken in(Ports matched and polished, lightened flywheels, bored to 82.5 with Wiseco pistons, light mods, etc). I'm trying to tune the carbs(rebuilt to stock specs) to get enough throttle response to break it in properly. I have read and understand most of Mikuni's carb tuning info but have a few questions I hope someone can help with.
I got it idling good tied to the trailer in the water at about 1530 rpm's with the low speed adjusters way out to 1 1/2 to 2 turns from bottoming. This is the only way I can get it to rev smoothly off idle (More fuel demands being that the motor is modified?) I know it's still in the process of being broken in but want it to run decent enough to get to all the throttle positons to do the heat cycles it needs to break in(32:1 premixed, oil pump delete). The plugs look a little rich but OK in both cylinders. Do I need to go to a bigger low speed jet then try leaning the low speed needles in until it's closer to spec? My pop off is at 33 on both carbs... When I do rev it past half throttle with the low speed adjusters open so much it seems to bog then want to clean out making me think that a bigger high speed jet is needed to... If I have left out any info just please ask.
Thank you so much
I got it idling good tied to the trailer in the water at about 1530 rpm's with the low speed adjusters way out to 1 1/2 to 2 turns from bottoming. This is the only way I can get it to rev smoothly off idle (More fuel demands being that the motor is modified?) I know it's still in the process of being broken in but want it to run decent enough to get to all the throttle positons to do the heat cycles it needs to break in(32:1 premixed, oil pump delete). The plugs look a little rich but OK in both cylinders. Do I need to go to a bigger low speed jet then try leaning the low speed needles in until it's closer to spec? My pop off is at 33 on both carbs... When I do rev it past half throttle with the low speed adjusters open so much it seems to bog then want to clean out making me think that a bigger high speed jet is needed to... If I have left out any info just please ask.
Thank you so much