[motomikey]

I just installed a yoshimura pro series am running a 170 45 main 2-turns on the screw air box mods pink wire cut.
gas it when its warm its starts sputering & poping??
Any ideas or set up advise would be great
thanks mike

[Asmith]

What type and what setting is the needle?

[motomikey]

the pipe is the pro seires,needle on 4th clip. I think i might of found the problem put a new ims tank on same time as pipe am going to check pet cock maybe plastic in it?

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It only tales a speck of crud to jack up the pilot jet and cause symptoms like yours.
If so a thorough cleaning and an in-line fuel filter would be in order. Doug

[motomikey]

I checked tank & screen ,pet cock all clean.
Maybe ill try going to 5th clip??

[[email protected]]

How about the pilot ?
A bike doesn't go from running great to sputtering and popping like that for no reason at all, unless the temperature dropped by 30-40 degrees or so.
I'd pull and thoroughly clean the pilot, and make sure th efront and back of the carb is secure in the boots.
Lots of us have installed that system or one similar without results that dramatic, usually little to no jetting changes are required as far as the low end goes, as long as the jetting was good before which your's clearly was.
My best main wound up being a 162 with the same needle, clip position and pilot as yours with the same exhaust but also running a Stage 2 HotCam.
This isn't a jetting problem. Doug