I was right, it was the harness(again)
Any reason why I can’t run the idle higher then .940v? With .940 I only get 1400 cold and 1600 warm so it’s still a little low. Base is set dead on at .7.
A tip someone gave me on FB; Set idle to desired RPM (1700+/- 200 RPM) then set your TPS to read .940. I did this and so far it seems to have worked well. Idles better cold and reverse works better. Ill test more this weekend. It is a apparently suggested by polaris directly for sleds that have idle issues. Mine has never idled cold since new and would still not idle with the .700/.940 TPS setting. Even warm it did not like to idle. I think it may be a BD turbo thing too.
On that note, if you go much above .950 it will not go into reverse and the ECM will not like it. I tried this and did not get favorable results. So far the best results are as said above.
To make the idle adjustment easier, you could also get a mikuni late model KTM 300/250 carb idle adjustment screw, cut the tip off, install a spring, and replace that PITA idle screw polaris put in. I will also be testing this over the weekend to see if it is affected by vibration. I will do a write up on it with part numbers if it works out well.