Tc_01
06-04-2016, 10:54 PM
Short version of the question:
When my needle clip was at the top slot, my 250r was bogging really really bad at acceleration, until the higher rpm's. Then i moved the clip to the bottom slot and it accelerates much better, but still has a significant bog..does this mean i need a richer needle? Or richer main jet?
Ive gotten confused with the different threads ive read.
Long version of the question:
I started trying to jet my mikuni tm38 on my 84 250r. Originally, when I tried to accelerate, it was really doggish at low to mid rpms. Once it hit higher rpms, it took off very strong. I originally had the E-clip on the center notch of the needle. I meant to go richer by putting the clip at the bottom notch, but because i was paying attention to two things at once, i accidentally put it at the top notch. Acceleration got significantly worse. I took it apart to move the clip the other direction. This is when i realized i moved it to a leaner position rather than richer. So this time i moved it to the richest position.. it accelerates much better than the previous two positions, but it still bogs significantly.
Ive read that the main jet only affects 3/4 to full throttle so based on that i would say i need a richer needle..but ive also read that if your clip is at the richest slot, it means you need the next size bigger main jet. I can kinda understand that because the fuel has to pass through the main jet in order to even get to the needle. And this is only my theory, which could be dead wrong: if the main jet is too restrictive, the needle would need to be in its richest setting to create enough vacuum force at the main jet to pull more fuel through it??
When my needle clip was at the top slot, my 250r was bogging really really bad at acceleration, until the higher rpm's. Then i moved the clip to the bottom slot and it accelerates much better, but still has a significant bog..does this mean i need a richer needle? Or richer main jet?
Ive gotten confused with the different threads ive read.
Long version of the question:
I started trying to jet my mikuni tm38 on my 84 250r. Originally, when I tried to accelerate, it was really doggish at low to mid rpms. Once it hit higher rpms, it took off very strong. I originally had the E-clip on the center notch of the needle. I meant to go richer by putting the clip at the bottom notch, but because i was paying attention to two things at once, i accidentally put it at the top notch. Acceleration got significantly worse. I took it apart to move the clip the other direction. This is when i realized i moved it to a leaner position rather than richer. So this time i moved it to the richest position.. it accelerates much better than the previous two positions, but it still bogs significantly.
Ive read that the main jet only affects 3/4 to full throttle so based on that i would say i need a richer needle..but ive also read that if your clip is at the richest slot, it means you need the next size bigger main jet. I can kinda understand that because the fuel has to pass through the main jet in order to even get to the needle. And this is only my theory, which could be dead wrong: if the main jet is too restrictive, the needle would need to be in its richest setting to create enough vacuum force at the main jet to pull more fuel through it??