Replacement/upgraded accelerator pump jets? By glavey (Read 2,914 times)

[cyborg]

It's a sweet setup too Alley

[glavey]

Ok, I will try to get that done today or tomorrow. I already have a thread for all of the mods I am doing to my scoot here, but it isn't focused just on the oil cooler. I'll type up a seperate summary dedicated to just the oil cooler project.

I'm off to try and tame the carburetor.

[glavey]

I didn't get too much done with the scooter today.

I removed the 30 idle jet, installed the 33, and raised the clip/lowered the needle. The hesitation got a bit better; I could blip the throttle after letting the engine idle for a while and it wouldn't bog as much, though it does still bog. The same is true for holding the throttle open until the hesitation stops, though the engine still doesn't go straight back down to idle after snapping the throttle closed, but it is much better then it was with the 30 and 32 idle jets.

I was just about to shoot a video of this; I got my cellphone out and saw I had a few new text messages. A family member had an unfortunate accident involving a pothole. Big heavy car + bad alignment + (inflated) worn old tire + pothole = worst alignment, deflated old tire, many curse words, and $300 in towing and tires.

After I got back from helping them and doing some grocery shopping for them, it was already 5pm, which is when I tend to stop working on my scooter (or any loud activity for that matter). I like to keep my neighbors happy.

I'll continue tuning and changing jets tomorrow. Perhaps I'll get started on the oil cooler summary tonight.

[glavey]

I think I nailed it!

I went out, warmed up the engine with the 33 idle jet in the carb and the needle down one notch/clip one notch up from center. The hesitation and bogging were markedly improved, though still slightly present:



I lowered the needle/raised the clip one more notch to the top most position. Again, there was an even more pronounced improvement in acceleration from idle. The hesitation/bogging was only minutely present when the throttle was blipped after the engine had been idling for >30 seconds.



The engine was behaving excellently, but to get the highest idle, I had to have the mixture screw out 3 3/4 turns; a bit too much for my comfort. I put the 34 idle jet back in and moved the clip down to one notch above center.



The engine ran about the same as it did with the 33 idle jet and the clip one notch above center, but now there was almost no waiting for the engine to go back to idle after you snap the throttle closed, it just went straight to idle. Also, the mixture screw was only 2 1/2 turns out; perfectly acceptable.

Next I did what I did with the 33 jet, I put the clip in the highest position/needle in the lowest position, and retested. Perfection! Little if any hesitation, no waiting for the engine to come back down to idle.



I went out for a ride to test out the new tune. Much better acceleration from idle. I feel much less worried while at a stop light or stop sign with traffic behind me.

I am about half done with the oil cooler project summary; I'll probably have it done tonight. I'll post it in the tech contributions section when I'm done.

[Alleyoop]

The engine was behaving excellently, but to get the highest idle, I had to have the mixture screw out 3 3/4 turns; a bit too much for my comfort. I put the 34 idle jet back in and moved the clip down to one notch above center.

The engine ran about the same as it did with the 33 idle jet and the clip one notch above center, but now there was almost no waiting for the engine to go back to idle after you snap the throttle closed, it just went straight to idle. Also, the mixture screw was only 2 1/2 turns out; perfectly acceptable.

Next I did what I did with the 33 jet, I put the clip in the highest position/needle in the lowest position, and retested. Perfection! Little if any hesitation, no waiting for the engine to come back down to idle.

FANTASTIC finely found the right mixture and setting, GREAT JOB MAN.
Alleyoop

[cyborg]

Happy day!!!!!!!

[glavey]

May 21, 2015 17:59:19 GMT -6 cyborg said:

Happy day!!!!!!!

Indeed!

Now it's time to cook up some hot dogs on the grill, bake some beans, eat too much of both and make my room smell like a sulfur pit!

Oh, and Alley, I posted that oil cooler summary in the tech section. I hope it isn't too long.

[Alleyoop]

Thank you for the the write up on the oil cooler, many guys always want to get one but are little skeptical of putting one on. Your write will help calm their fears somewhat and they may just go and install one.
Alleyoop