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Hey just picked up another scrambler 850 was told the tps was bad.  This atv has been beet to hell.  Wiring has been tinkered with the crankcase has been replaced recently and the motor rebuilt (can see horizontal scores thru spark plug hole where it’s just been honed out and rebuilt)

my guess is it was ragged out till the motor blew a rod and rebuilt but the clown that did it couldn’t get it to run again and sold it.  When I bought it it would pulse and smoke black at idle and die with throttle.

New tps installed and it won’t run period.  I went to celebrate it and I’m getting 5 volts on 2 of the 3 wires running to the tps.  Is this normal and if so how should I celebrate it?

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  • 2 weeks later...


I’m going to see how much a new Scrambler 850 computer is for it from Polaris cause I really don’t want to take the computer off my other bike it’s a pain to do and the wiring job on the base model from the former owner is shady I’d rather not screw my good ecu😂

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agreed.  cheapest i can find it about 150 tho..  i guess if it dont work i can return it..

and thats another thing.. yall think two wires could be crossed on it?  the whole bike has been rebuilt... wiring harness has been chopped up some here and there and its got a new crank case on it

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  • 4 months later...

update on this bike, found a wiring diagram, checked wiring, and its all good.  swapped ECUs with my other scrambler and the ECU is good.  took the bike to my local polaris dealer to dial in the tps and they charged me $100 to say the diagnostic tool said the new tps was toast.  so back to the drawing board.  ive heard of the timing gear on the cam jumping time on these machines so that may be an issue.. will check that also.

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