Jet problem? By knottidedown (Read 353 times)

[knottidedown]

I had the "stock" jet in my 2012 Powermax 150 (it does not have any markings on it) with an aftermarket exhaust. Worked well (12 g rollers, stock spring in my clutch- at 6500 rpm I was going 50 mph, 7k-55 mph) I added a K & N type air filter and replaced rollers with 13 g sliders and a 1500 clutch spring (came with the new aftermarket clutch) and aftermarket clutch. I replaced jet with a 115 and I could not get over 20 mph without the engine coughing and sputtering, replaced with a 110. Could get to 25mph and same thing. Replaced with 105 and I can get to 44mph, but rpm is now at 7k at 44 mph. Any faster and the engine begins to cutout.

I thought the heavier sliders would allow me to go faster at lower rpm? Should I go back to the stock spring? I thought I would have to go up on the jet size when adding an aftermarket exhaust and air filter, but it does not seem that way. 

Any help?

[Alleyoop]

Yep, take the 1500 spring out from the new clutch and put in the old spring from the old clutch. That will require lower rpms to get up to speed. Then you can work on the main jet. Put in the OEM and work your way UP or put in the largest and work your way down.
Alleyoop

[knottidedown]

Had the stock jet on 150 powermax with aftermarket exhaust and all was GREAT. Put on an aftermarket ain't filter and now all is bad!
with a 125 jet it bogs as soon as I take off, 120 bogs around 15 mph, with 115 around 20, with a 105 around 35. I went back to the stock jet and it starts around 40 mph!!!! This is killing me!

[Bashan]

Why not return to the configuration that was running well? Most 150 OEM jets are 104. Pull your plug after running one of those big jets and it will probably be oily black. That means it's too rich. If your mixture is correct it will be a light tan. So adjust your air intake or the jets accordingly. You can tape off an "ain't" filter until you hit the right mixture.