Posts
35
Joined
10/31/2017
Location
Lewiston, ID
US
Edited Date/Time
4/4/2018 7:15am
So I just picked up a new 2017 150sx the other day. I rode it for the first time and I was impressed with the power and the light feeling it had. The jetting was a little rich on the bottom but I think that can be fixed by moving the needle. I've read a ton of different things on jetting and using different carbs. I want to just keep the mikuni carb and get it jetted right. Does anybody have some good jetting recommendations? JD jet kit worth it? Any feedback is appreciated.
Also let me know what are some good mods to do to this bike. I'd like to do a Vforce 4 reed block and a fmf 2.1 silencer. And of course a few other bolt on goodies. Let me know if you have any tips/ tricks about this bike and what else I should do to.
Thanks.
Also let me know what are some good mods to do to this bike. I'd like to do a Vforce 4 reed block and a fmf 2.1 silencer. And of course a few other bolt on goodies. Let me know if you have any tips/ tricks about this bike and what else I should do to.
Thanks.
My jetting was very rich until about half throttle when I got it. I tried a few different options starting with MXA's recommendations as a baseline and moved around from there. FYI I am using 40:1 with motorex premix and 93 octane pump gas. My riding consists of a combination of sand, loam, and dirt. I am an intermediate 25 year old rider, spend my time equally between racing and open practices.
I dropped the Pilot down to a 35 from a 45 stock. I messed with a 32.5 but ran the 35 for a bit of safety and piece of mind. I used the 43-74 needle in the lowest position (clip is at the very TOP of the needle so position 1). Air screw 2.5 turns out. I can't remember for sure but think I dropped to a 460 main from a 470.
Once I found this setting the bike ran so much cleaner. The throttle roll on is crisp off the bottom and after 37 hours I just did my top end and the piston was in great shape, not too lean, not too rich. I was prepared to buy the JD Jet kit if buying the pilot and main jets I mentioned didn't work out, but my bike runs very well, thus I never ended up purchasing it.
When it came time to do a chain and sprocket I added a tooth to the rear (49T sprocket) to make 3rd gear easier to carry with less clutch.
The only other thing i changed was adding a set of Pro Taper Fuzion bars in the SX race bend because I like a crossbar. THis summer I would like to get an FMF Fatty pipe. I am torn between the shorty and powercore 2.1 silencers, I see more people around me running the shorty, maybe someone with experience on both can weigh in.
My stock reeds upon inspection must have been a good batch because they were fine with no gaps, when the time comes i'll get a V-force 4.
Once I wear out the stock sprockets a bit, I plan on adding a tooth to the rear also.
For the silencer I have the same problem. I'm not sure if I should get the shorty or spend the extra money and get the 2.1. I cant see myself spending the money on the ti 2.1 so I'll probably go with just the stainless.
Also planning to go through the linkage and swingarm bearings to grease everything up well. Typically bikes that come from the factory aren't greased very well.
The Shop
On our 125 we went leaner pilot and needle and richer on the main.
Amazing fun bike to ride
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