Help tuning 07 stock 70 mxr

[nordic quad]

Help with tuning 07 stock 70 mxr.Everything was way off when we got it from the dealer,it didnt want to rev up even with the weels clear of the ground,called the dealer he tould me to take out every other roller of the vario,this helpt it rev up but it did not shift propperly so i turned to the carb dropt the needle all the way down changed the main jet from 115 to 108,this gave us great hole shots and the vario shifted out,the problem now is that it sme times locks up in high gear in the slow corners and is slow to rev up.Have tried to install al 6 rollers after the fine tuning but still the same problem wont rev up at all tried eveything from 3,0 to 7,0 rollers.Is the solution a koso 2000 drivespring:ermm: :confused: .Any ideas anybody.
Stein A.

[Shawn+3]

Koso springs and rollers are the way to go.My son had a bog problem off the line and corners, changed to Koso springs and rollers problem has went away.

Shawn+3

[nordic quad]

Thank you Shawn+3 its alvays good too have a second oppinion,what kind of rpm setup do you have?
Stein A

[Shawn+3]

The Koso 1500 drive spring

Shawn+3

[nordic quad]

Thank you Shawn+3 i will give it a go.

Stein A

[Shawn+3]

Try4.5- 5.0 rollers with 1500 drivespring.

[nordic quad]

Ordered full Metrakit set up With vario and rollers,adjustable clutch and divespring,shold have it in a coupple of days will report back how it all works.

Stein A.