Post by CrankingWithCG on Jul 2, 2020 1:08:10 GMT -5
Stick with me, there's a lot to explain
Recently installed a 155 kit in my 150, with NCY valve springs, and a self ported head to back up the 28mm Keihin roundslide carb and the NCY metal intake. After much deliberation with the kickstart, it finally started.
I went from a 40 pilot 120 main w/ no air filter to a 42 pilot, 125 main with the filter reinstalled. The 42 seemed way too small, idle ran up and down, and hung up bad after i gave throttle. It sounded like it was idling at 3000 or something around there. Upon screwing the air screw all the way in, it idled down, but died from dropping so low.
Threw in a 48 pilot, and much the same problem, though not as severe. No hanging up, but the idle sits at maybe 2200 or so occasionally drops down after i rev, but comes right back up. Its not a very smooth idle either. Imagine like a built predator 212 or something like that. When playing with the idle screw, theres a certain point. If i go below the point, turning the idle down, by ANY amount, it starts chugging really low like its gonna die. If i turn it up past the point, back to choppy high idle.
It seems the richer i go, the better it gets, but should it really need a big pilot like a 52 or 55?? It doesn't make sense to me.
Also, theres a bit of a kind of dead spot. If im sitting, and I crack the throttle open hard, it bogs, like its chugging air. If i keep holding it, itll eventually die. However, if i hold the throttle open a bit, or rev multiple times, THEN launch, it takes off not as hard, but still fast as all hell.
In the midrange, itll sometimes cut out. Itll run kinda smooth, then miss, lose power for a split second, then back to runnning normally. Is this kinda thing rich or lean? It feels slightly weak, like the engine is struggling and not running smooth.
But when it runs.....oh man does it go! From a stop, if i kinda snap the throttle right, the front tire pops up a few inches. The top end isnt broken in yet, so i didn't wanna beat on it too hard, but on a quick run, i maybe held wide open for two seconds, cruising maybe half throttle most of the time, and hit a gps indicated 51. On the old kit, it started running out of steam around 55. 51 would be a very high cruising speed. On this, rpms sounded kinda high, or maybe the engine is just louder, but it hit 51 and it didn't feel the littlest bit over worked.
If anyone has any input, it'd be much appreciated!
Recently installed a 155 kit in my 150, with NCY valve springs, and a self ported head to back up the 28mm Keihin roundslide carb and the NCY metal intake. After much deliberation with the kickstart, it finally started.
I went from a 40 pilot 120 main w/ no air filter to a 42 pilot, 125 main with the filter reinstalled. The 42 seemed way too small, idle ran up and down, and hung up bad after i gave throttle. It sounded like it was idling at 3000 or something around there. Upon screwing the air screw all the way in, it idled down, but died from dropping so low.
Threw in a 48 pilot, and much the same problem, though not as severe. No hanging up, but the idle sits at maybe 2200 or so occasionally drops down after i rev, but comes right back up. Its not a very smooth idle either. Imagine like a built predator 212 or something like that. When playing with the idle screw, theres a certain point. If i go below the point, turning the idle down, by ANY amount, it starts chugging really low like its gonna die. If i turn it up past the point, back to choppy high idle.
It seems the richer i go, the better it gets, but should it really need a big pilot like a 52 or 55?? It doesn't make sense to me.
Also, theres a bit of a kind of dead spot. If im sitting, and I crack the throttle open hard, it bogs, like its chugging air. If i keep holding it, itll eventually die. However, if i hold the throttle open a bit, or rev multiple times, THEN launch, it takes off not as hard, but still fast as all hell.
In the midrange, itll sometimes cut out. Itll run kinda smooth, then miss, lose power for a split second, then back to runnning normally. Is this kinda thing rich or lean? It feels slightly weak, like the engine is struggling and not running smooth.
But when it runs.....oh man does it go! From a stop, if i kinda snap the throttle right, the front tire pops up a few inches. The top end isnt broken in yet, so i didn't wanna beat on it too hard, but on a quick run, i maybe held wide open for two seconds, cruising maybe half throttle most of the time, and hit a gps indicated 51. On the old kit, it started running out of steam around 55. 51 would be a very high cruising speed. On this, rpms sounded kinda high, or maybe the engine is just louder, but it hit 51 and it didn't feel the littlest bit over worked.
If anyone has any input, it'd be much appreciated!
