Something I have been curious about with those carbs, since I have considered getting one on my Hawk. Does the accel pump have any timing adjustment to it? If so, make sure to check and adjust it before running it to avoid any potential tuning headaches. You will want the spray from the pump to just clear the throttle slide as it opens. If it hits the throttle slide, it can make for some odd behavior, and if it sprays too late you can end up with a lean - very rich - normal behavior that can make for a very entertaining experience.
It's a good idea to setup and test this with the carb off the bike. I like to use mineral spirits over actual gas, but that is just personal preference.
Quote:
Originally Posted by Douglass
I installed the Mikuni 30mm Carb on my Apollo 250. Bike runs fantastic, but I have not taken it out on the trails yet.
|
The key difference between the VM26 and this particular carb is the accel. pump. It doesn't really add more power, but instead helps eliminate the slight moment of lean condition that happens when you open the throttle more.
On a standard carb like our Mikuni clones, the air rushes in, but it takes a moment for the fuel to be drawn in. On a well tuned carb, we won't really notice it as any sort of dead spot, but it does cause a minor delayed feeling in the throttle response.
The Accel pump squirts a tiny bit of fuel in right when you open the throttle to help eliminate that lean spot, and it gives the engine an almost light switch feel to the throttle. Good for when you want to be able to have power right when you request it. The CRF230F 26mm Keihin carb has a rod actuated accel pump from the factory, Many dirt bikes tend to for this reason.