KTM/Husqvarna Power valve settings

[hjk437]

So im setting up my 2017 Husqvarna tx300 to run a 120 kit. I will be using an RK tek head, vforce 4 reeds, 38mm lectron, along with a fresh piston. Curious as to what baseline people have had good luck with on power valve spring choice and pre load. Im thinking red spring with a bit of pre load and play with it from there. Can anyone give me any insight on what has been successful for them on similar setups? TIA

 

[wwillf01]

So im setting up my 2017 Husqvarna tx300 to run a 120 kit. I will be using an RK tek head, vforce 4 reeds, 38mm lectron, along with a fresh piston. Curious as to what baseline people have had good luck with on power valve spring choice and pre load. Im thinking red spring with a bit of pre load and play with it from there. Can anyone give me any insight on what has been successful for them on similar setups? TIA

I would do red spring with it one turn from out... because most likely your always going to be on a full open because you will be at 5k and up on the rpms ...

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[hjk437]

do you mean one turn in from beginning?
thank you

 

[wwillf01]

Correct... so from flush with the case one turn... and even flush with the case because you want the power valve to open as soon as possible in my experience for a snowbike... then for sure the red spring.

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[portgrinder]

red. close to all the way out.

V force seemed to lose a couple ponies all the way through. will try again to verify.