2015 KTM 85 SX

Question

Workin on my son’s 2015 85sx,we ride woods,i put a flywheel weight on to smooth out the power band and help it lug better,both were accomplished,it has an fmf turbine core II silencer,carb settings are all stk and running a 118 main at 1000 ft,the bike seems sluggish on bottom,i know the weight is playing a factor,am i taking the wrong approach,ideas or suggestions ?


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Spencer 6 years 0 Answers 1350 views 0

Answers ( No )

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    Drop a tooth on the front sprocket. If that’s not enough go up one or two in the rear.

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    Jetting… Jetting

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    Top end fresh? Good compression?

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    Um, isn’t making it sluggish on the bottom what the weight is supposed to do?

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    That’s a sharp looking bike. Good dad.

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    Not sure about an 80cc jetting but 118 main sound lean. Jetting can make all the difference. If not sure buy a JD kit and play with the settings.

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    Flywheel weight is a good thing. Jet it by the book. Head mod,thinner base gasket, *Light porting. Ultimately you want a 105 kit.

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    I’ve found in my wise old age, get the bike running right and ride it. That bike will do things most adults can’t handle. YouTube Herlings on a 85.

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    What needle are you using? N5HG? If it’s a bit of a slug at bottom end, perhaps a leaner needle? N5HH?. \n\nOn our 105SX and SX, we’re running 40/115 pilot and main with N5HG needle at the top clip, 40:1 Motul 800, and most of the same pipe and silencer stuff you’re talking. They scream but do damned well for trail riding and lugging. However, hill climbs are still a challenge from a stop.

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    Call phil patton at fivestar in seagertown pa.

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    Finally got a 115 main jet put in it and tightened the power valve nut about an 1/8 of a turn and that lit a fire under it’s ass ! Thanks for everyone’s suggestions and opinions !

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