Scooter Jetting - First Time Advice? 150CC CY6

gmcjetpilot · 07-28-2017, 06:30 PM

OK I really like my BMS Prestige 150. However it is running lean (plug is white white white). My first UP jetting is described below. I'd like advice and comments (sage wisdom)....

Removed original 110 main and went in with 120 main, I skipped 115 since I am so lean. (what size jet should I go to if this is not enough. My choices are 125, 130, 135 & 140.

Removed original 32 pilot. I went in with 35 pilot, next size up with the jet kit I received. My next choices are 38, 40, 42, 45, 48, 50, 52 & 55.

Pilot Jet - Original was short, sat deep in the pocket it screwed into. New Pilot Jet is longer, mouth sits flush or slightly proud. (is this a big deal?)

Needle has a flat top and does not have clip ring adjustment.... (is this a needed mod, where you can adjust the height?)

I only took it on a short test hop. Seems to run fine, as usual. No top speed test. Still a little boggy in mid range acceleration, but overall same or slightly better.

Tried to go wide out recently with stock jets. At 150 miles on OD, I am still breaking it in. However I decided to try for top speed. 50 mph was it. Not impressed. Seemed fine at 45 mph, but I was surprised at low top end. I thought 55mph would be doable?

COMMENTS FOR A NEWBE RE-JET-ER....

View Poll Results: What is your Jetting Main and Pilot, Pick 2?
Main Jet 100 t0 108	0	0%
Main Jet 108 to 115	0	0%
Main Jet 115 to 125	1	50.00%
Main Jet 125 to 130	0	0%
Main Jet 130 to 140	1	50.00%
Pilot Jet 32 to 35	1	50.00%
Pilot Jet 35 to 40	0	0%
Pilot Jet 40 to 45	0	0%
Pilot Jet 45 to 50	0	0%
Pilot Jet 50 to 55	1	50.00%
Multiple Choice Poll. Voters: 2. You may not vote on this poll

07-28-2017, 06:30 PM	#1
gmcjetpilot Join Date: May 2017 Posts: 37	Scooter Jetting - First Time Advice? 150CC CY6 OK I really like my BMS Prestige 150. However it is running lean (plug is white white white). My first UP jetting is described below. I'd like advice and comments (sage wisdom).... Removed original 110 main and went in with 120 main, I skipped 115 since I am so lean. (what size jet should I go to if this is not enough. My choices are 125, 130, 135 & 140. Removed original 32 pilot. I went in with 35 pilot, next size up with the jet kit I received. My next choices are 38, 40, 42, 45, 48, 50, 52 & 55. Pilot Jet - Original was short, sat deep in the pocket it screwed into. New Pilot Jet is longer, mouth sits flush or slightly proud. (is this a big deal?) Needle has a flat top and does not have clip ring adjustment.... (is this a needed mod, where you can adjust the height?) I only took it on a short test hop. Seems to run fine, as usual. No top speed test. Still a little boggy in mid range acceleration, but overall same or slightly better. Tried to go wide out recently with stock jets. At 150 miles on OD, I am still breaking it in. However I decided to try for top speed. 50 mph was it. Not impressed. Seemed fine at 45 mph, but I was surprised at low top end. I thought 55mph would be doable? COMMENTS FOR A NEWBE RE-JET-ER.... Last edited by gmcjetpilot; 07-31-2017 at 11:36 PM.
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