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I don't believe it "adds" to the main jet. It is conjunction with it. So, overall fuel going to the cylinder could be affected by the a/f screw. I don't think you are going to get an exact percentage of how much the idle jet affects the overall fuel percentage, especially with the differences in carbs. I think it matters more on paper than real world applications. Once your idle is set, then use the your good judgement to adjust the the needle and main jet to fine tune the happy medium between off idle and wot.

Good luck.

Prodigit - you already have more than 800 posts since the new board has been open in its few months? Wow!

There are 2 things that crossed my mind. If you have the Airsal kit, it is aluminum. Remember that Aluminum is more prone to warping if it is overheated, which a lean condition can do.

Also, you say it's fine for about 60s. I wonder if you are not getting enough fuel into the bowl of your carb. Are you sure your fuel filter is not clogged or if directional, is the right way. Make sure that your fuel flow is good as well as the vacuum line for it.

Hi all,

So, within a month I purchased 2 of Enviromoto's Power Pack for the 139qmb. I also bought 2 NCY CDIs and 1 new carb. 2 separate purchases for 2 different scooters. Thats over $400!

The first time I ordered, it took him more than 3 days to ship the stuff out and not until I contacted him did he tell me that he was out of an item and had to wait on it. I ordered on a Tues morning and hoping to get it by the weekend. I am only about 3 hrs driving distance from him. Well, he didn't send it out until Friday afternoon and I was hoping to do the install over the weekend.

The 2nd time I purposely emailed him on a Monday if he had all the parts in stock and he said yes. I wanted to make sure so I could get my stuff to install on the weekend. Well, I got a response the next day and ordered. Again, not until I asked about the shipping did he tell me he was out of stock on something. He put into Google wallet that he shipped the item on Thursday afternoon (probably just got shipping label for it). Well, he didn't get it to the post office until Friday afternoon again.

Shipping wouldn't normally be a big deal, but I have to use a different address for the weekend because of where I am going to be. His packages have to be signed for with USPS. Both shipments arrived on Monday and I had to drive to the weekend locations to pick up.

THEN!!!
The NCY CDI that I purchased didn't work!. I emailed him, sent him pics of my wiring, sent him a video of the CDI not getting power with the key, and he tried to tell me that I had a DC system (again 50cc 139qmb scooter), and that I ruined the NCY CDI (AC). He then reiterated his no return policy even copy and pasting it. I told him I didn't want a return, but wanted an exchange for a working CDI. Nope. After ordering a DC CDI that didn't work, getting help on this forum to clearly identify that I have an AC CDI (which confirmed what I thought), I emailed Jeremy Hall TWICE if he had the pinouts for the NCY CDI so perhaps I could work with my wiring to make the NCY CDI work. NO RESPONSE TO THIS DAY!

What's funny is I get more responses and better customer service from Scrappydog. I mean, they email you if they don't have a part and it's estimated arrival, I canceled an order with full refund, items shipped next day, and you can get some of their stuff cheaper on ebay.

I paid for 2 CDIs that don't work on my scooter and Jeremy Hall is ignoring my emails. Funny is he is quick to get back to me if I am asking about purchasing a product....

Congrats on the install! A BBK was the first thing I did on mine and it is much easier to install than new owners think. Too bad you are just out of reach being in Mchenry. I'm in Chicago.

I appreciate your help. Unfortunately, I don't have the Peace scooter with me, other wise I was going to look at its wiring. Also, Jeremy hasn't emailed me back.

The extra oil being pushed could be caused by excessive blow by or a burnt piston (at the worst). If you were running that bbk with a stock main jet, then you were running the risk of burning a valve or piston from the heat. Is it a coincidence that your problem is happening when the weather got warmer? Maybe not, because the engine might not be as cool as the winter. Also check your oil level if oil has been blowing out a lot. Less oil means less cooling as well.

As far as oil ending up on the ground. It might have always been leaking out as you ride....you just see a puddle when stopped.

If I were you, I would take that bbk apart and see the condition of the piston, valves, and rings. If you are lucky, there is no damage, or there is only damage to the rings and the cylinder wall is still in good shape.