NEW GUY- '07 DS250 rejet questions (a little lost here)

[Labatt]

Hello, I am new here [img]i/expressions/face-icon-small-smile.gif[/img]

Short story short-

Bought wife a DS250, she is already griping about it being too slow after two months.

Mods for these are few and far between-
I can only find one pipe available, and I don't really like the looks of it, so I took a sawzall to the factory end cap up to remove the spark arrestor and make the output larger. (big difference for 10 mins worth of work)

Rejetted carb from 105 main to 120 and left the pilot alone @ 35????( if I remember right )

I moved the needle to the highest position ( the lowest groove...was originally only one notch higher/lower however you want to look at it )

Quad runs nicely now but I can not seem to get a bit of hesitation out of it when you snap the throttle hard. If you hit it hard enough you can actually choke the engine so bad it stalls. The mixture screw does not seem to make much of a difference. This only happens at rather low RPM's, I can get rid of it by turning the idle up high (too high to leave that way though)

Any ideas on where Im going wrong?

I am thinking I need to either readjust the needle or get a different pilot jet, but I am not sure.....could the main be too big?

[crazy1291]

You did what? Took out the endcap, and then even rednecked the hole bigger? Where did you get the 120 jet for this thing?

I would just play it safe and do this:

1) Get fmf powercore4 pipe for ds250
2) Get durablue powerfilter
3) Get dynojet stage1+2 jetkit
4) Install all these (stage2 DJ ofc, not stage1)
5) Take off airbox lid.
6) Ride the heck out of it.

[crazy1291]

By the way, have you found any clutch kits for this thing?

The power mods wont help this automatic quad reach full potential without a clutch kit I think.

[Labatt]

hmmmm, I looked at fmf's web site like the week before last aqnd could not find a pipe for it. I will look now. And yes I did "redneck" the endcap lol, out of what I thought was necessity not because that is normally how I do things though [img]i/expressions/face-icon-small-smile.gif[/img]

Edit- no luck on a clutch kit yet either.

[crazyrider1888]

do those fmf powercore4 work really good on the DS250 i have an 08 is the torque good and the power

[crazyrider1888]

do powercore4s make a diffrence for the DS250

[DS650powe]

could be needing for feel on bottem, try a larger pilot jet and see if that fixes it.

[crazyrider1888]

where do u find a pilot jet for the DS250 i have a fmf pipe coming the powercore4
hopfully it does somegood

[huntingfromaquad]

Try looking for Kymco Mongoose 250 parts. I think they are interchangable.