Hey there here's a new idle/throttle problem for you!
Skyhawk GT2 48cc;
SBP Expansion Chamber - tuned;
CNS 2 Carb with Slim SBP AirFilter;
Boost Bottle (proven to work great for me);
On 3rd notch on clip, and float is level;
Piston clean, jug smooth, brand new spark plug;
Great spark, no shorts anywhere;
No air leaks - checked everywhere with WD40 while idling;
All gaskets tight, again no leaks;
Muffler clear, not clogged;
Running 32:1 mix and have about 300 miles on the bike.
Southern California, warm weather, about 500 above sea level.
And sooo....
Had this bike running great up until a couple days ago.
I could idle fine (1.5 turns out on screw).
I could throttle right up through to top end (30mph) no problem, nice and smooth with a LITTLE bit of bog at about 10-15mph, then it would power out of it.
Put a new jug on (cuz' I broke the old ones exhaust flange), and noticed after puttin' her all back together, that I seemed to be running lean (bogging at WOT), so I adjust C clip down a notch, made it worse.
So I went back to middle position, and still no good.
Then, I realized that with the choke up about 1/2 way, I could get it to run fine at WOT, but deduced that that meant I was still running lean.
So I messed with the screws, and viola, with the air/fuel screw in almost down to it's 'seat', (90% screwed in), it idled fine, and I could get her to run though the whole band, for all of 2 rides, then bog, bog, bog, bog.
Then the backfiring began, let off throttle while riding and POP!!!
Then, no throttle response at all, just Bog, bog, bog.
Checked the plug and it was all crusty black, carbon fouled, but NOT wet black. That told me way to lean again!
So, I went through the entire checklist at the top of this post, and put her all back together with a new plug, and fired her up without the muffler on, and she idled to HIGH RPMS out of control.
Threw the muffler back on, and she calmed down a bit, but still out of control idle, and when I engaged the motor, she would just bog, bog, bog.
When I pulled in the clutch...Revvvvvvvv out of control.
Then, she calmed down a bit, and I was able to once again, keep her idling like this:
run, RUN, run, pop, p'pop, p'pop run, RUN, runrun, rrruunnnnnnn, p'pop, and when I gave her the tiniest sip of fuel with throttle, booooggggggggg, til dead.
Ok, there's a mouthful.
Throttle cable is tight/good from top to bottom, and I haven't a CLUE what's going on.
Here's a link to a video, Poor throttle... - YouTube
(sorry, you'll have to turn your head sideways!).
Listen for the idle pattern, and then at the end, I'm only revving it with about 10-20% throttle, and then it dies.
Thanks for your time!
Sincerely,
Chris B.
Skyhawk GT2 48cc;
SBP Expansion Chamber - tuned;
CNS 2 Carb with Slim SBP AirFilter;
Boost Bottle (proven to work great for me);
On 3rd notch on clip, and float is level;
Piston clean, jug smooth, brand new spark plug;
Great spark, no shorts anywhere;
No air leaks - checked everywhere with WD40 while idling;
All gaskets tight, again no leaks;
Muffler clear, not clogged;
Running 32:1 mix and have about 300 miles on the bike.
Southern California, warm weather, about 500 above sea level.
And sooo....
Had this bike running great up until a couple days ago.
I could idle fine (1.5 turns out on screw).
I could throttle right up through to top end (30mph) no problem, nice and smooth with a LITTLE bit of bog at about 10-15mph, then it would power out of it.
Put a new jug on (cuz' I broke the old ones exhaust flange), and noticed after puttin' her all back together, that I seemed to be running lean (bogging at WOT), so I adjust C clip down a notch, made it worse.
So I went back to middle position, and still no good.
Then, I realized that with the choke up about 1/2 way, I could get it to run fine at WOT, but deduced that that meant I was still running lean.
So I messed with the screws, and viola, with the air/fuel screw in almost down to it's 'seat', (90% screwed in), it idled fine, and I could get her to run though the whole band, for all of 2 rides, then bog, bog, bog, bog.
Then the backfiring began, let off throttle while riding and POP!!!
Then, no throttle response at all, just Bog, bog, bog.
Checked the plug and it was all crusty black, carbon fouled, but NOT wet black. That told me way to lean again!
So, I went through the entire checklist at the top of this post, and put her all back together with a new plug, and fired her up without the muffler on, and she idled to HIGH RPMS out of control.
Threw the muffler back on, and she calmed down a bit, but still out of control idle, and when I engaged the motor, she would just bog, bog, bog.
When I pulled in the clutch...Revvvvvvvv out of control.
Then, she calmed down a bit, and I was able to once again, keep her idling like this:
run, RUN, run, pop, p'pop, p'pop run, RUN, runrun, rrruunnnnnnn, p'pop, and when I gave her the tiniest sip of fuel with throttle, booooggggggggg, til dead.
Ok, there's a mouthful.
Throttle cable is tight/good from top to bottom, and I haven't a CLUE what's going on.
Here's a link to a video, Poor throttle... - YouTube
(sorry, you'll have to turn your head sideways!).
Listen for the idle pattern, and then at the end, I'm only revving it with about 10-20% throttle, and then it dies.
Thanks for your time!
Sincerely,
Chris B.