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-   -   72cc BBK, jet question (http://www.scootdawg.net/showthread.php?t=56094)

peonpete 10-30-2018 09:06 PM
72cc BBK, jet question
 
Hi guys, i put a 72cc kit into my scooter about a month ago and besides that everything is stock. It surprisingly runs great with the stock setup and gets up to 37mph against the wind and 40ish with the wind at my back [im 220lb]. Now, i do want to up jet the carb for more performance. I have a kit that has a 80, 82,85,88 and a 90 jet.

I would like to take the air restrictor out of the stock airbox for more airflow and use a jet with it.

OR

I am willing to buy a free flow air filter and couple that with a jet.

If i could get some opinions on what jet to use for both options i would really appreciate it.

wheelbender6 10-30-2018 09:17 PM
Its mostly trial and error when it comes to jetting. Install a different jet. Ride a while (need to get close to max speed to use the main jet), take a spark plug reading, repeat... until the insulator on your spark plug is a nice tan color. If its white, install a bigger jet. Gray or black, install a smaller jet. Sounds like a drag but its worth it.

casey360360 11-15-2018 02:52 PM
Quote:
Originally Posted by peonpete (Post 537238)
Hi guys, i put a 72cc kit into my scooter about a month ago and besides that everything is stock. It surprisingly runs great with the stock setup and gets up to 37mph against the wind and 40ish with the wind at my back [im 220lb]. Now, i do want to up jet the carb for more performance. I have a kit that has a 80, 82,85,88 and a 90 jet.

I would like to take the air restrictor out of the stock airbox for more airflow and use a jet with it.

OR

I am willing to buy a free flow air filter and couple that with a jet.

If i could get some opinions on what jet to use for both options i would really appreciate it.
My friends and I have a saying, "if you're taking it off, replace with Performance."

Parts for yours are on the cheap side, I'd say intake and filter, full exhaust, rejet.

Sent from my LGL158VL using Tapatalk

Zappa 04-13-2019 07:36 PM
Quote:
Originally Posted by peonpete (Post 537238)
Hi guys, i put a 72cc kit into my scooter about a month ago and besides that everything is stock. It surprisingly runs great with the stock setup and gets up to 37mph against the wind and 40ish with the wind at my back [im 220lb]. Now, i do want to up jet the carb for more performance. I have a kit that has a 80, 82,85,88 and a 90 jet.

I would like to take the air restrictor out of the stock airbox for more airflow and use a jet with it.

OR

I am willing to buy a free flow air filter and couple that with a jet.

If i could get some opinions on what jet to use for both options i would really appreciate it.
I know this is from last October, but I just joined a few days ago and noticed there was no followup, so not sure if you got your answer. You didn't specify if you are running a two or four stroke engine. I just did a 72cc cylinder and performance kit on a 2002 Zuma and I'm working on the tuning right now. The stock jet was a #80, my jet kit goes up to #120, but after doing some research, I started with a #95. I ran it with no air filter and noticed a big improvement in power and speed, that was until I put the stock air box back on, then it wouldn't get up to speed. I took the restrictor out, but it didn't make a difference, so I replaced it with an aftermarket K&N style filter and the power came right back. It still bogs a bit in the mid range and I think I have a fuel flow problem, but the plug was a nice tan color showing me it's burning well.


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