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So yesterday I picked up a 07 polaris sportsman 800efi stealth edition for 3k.  Will lead a pic ltr.  In good shape.  Here's what's wrong with it:

The rpm needle doesn't work just like my other sportsman... not too worried ab that.

The motor doesn't sound like it's running quite right and doesn't feel like it has much more power than my 500.  I'm thinking it needs a tune up and some fresh oil..  but also it feels like it's running rich.  It's a little buggy when you goose the throttle and sometimes farts when you let off (like I little backfire out the exhuast). I'm gonna check timing and valave clearence on the motor first but thinking of putting a tuner on it? Anybody got a suggestion?  Mainly looking for more power.

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What’s up Jacob, congrats on the bike. I would start by going through all the basic stuff first. 

Check the air intake for blockages or obstructions. Throw a new plug in, check the exhaust for anting blocking it. 

Take a look at the ecu for any moisture past or present. 

Check you throttle position sensor also.  It could be out of spec.   There is a tool to calibrate it. Just check the specs on the number.  This is a big item that could be the culprit of your problems.  

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Yea sorry I havnt been on the forum lately..  been working 14 hour days.  So it's running a lot better now that I drilled holes in the exhaust to open that up...  turns out factory these bikes are tuned rich so now it's really responsive and spunky.  Still want a tuner for more power but I'll get to that ltr.  So ima do the usual run down... valve and timing check, new spark plugs, and front in alignment as it has a fair amount of tow out.

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I dont think it's an electrical issue, just the factory tune.  The speedo I think is just the cable and magnet that needs replaced.  Here are some pics. Also to start off could someone look up the vin?  For some reason I can never find a site that says any of my vins exist..

20190811_094402.jpg

20190811_094417.jpg

20190811_094424.jpg

20190811_094430.jpg

20190811_094513.jpg

20190811_145750.jpg

Here's a pic of the vin

20190811_154955.jpg

20190811_145756.jpg

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Nice looking bike. I like the radiator mount. I’m a little leery of drilling holes in the exhaust. Should not have to do that, I disagree with ya having to do that, the amount of back pressure allotted for the engine is a design/performance thing.  If there is an issue like that it’s a tuning thing.   Do some research on the TPS for your bike. Look on YouTube. I’m sure it will open your eyes to some tuning tricks.  

Im sure your very excited!!  It’s a bad ass bike. Be careful with that power. 

 

  • Thanks 1

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Ok.  So I drilled a hole a while back on my 500 and couldn't believe how much more power it had..  the stock exhaust on almost everything nowadays coups up the power in my opinion.  No I wouldn't go cut the pipe off at the manifold, but this is a 1/2inch hole in the end of the exhaust.  I'll check the TPS as well.  Not really concerned with the stock tune as I plan to put a tuner on it anyway.

But yes, yall can hurt you engine by allowing too much backflow into the manifold.

Edited by JacobSlabach

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So this is what I'm talking ab.  Also has a good light bar and bumper on it.  Last pic is of the 500

20190811_202836.jpg

20190811_202815.jpg

20190811_202901.jpg

Also here's a video of it running.  It's super responsive...  but I think I'm herding a valve talking or something...

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I’m sure you are excited!!! I’m so happy for you kiddo.  Now you have to put that thing in some mud and show us some videos!!

Cant keep up them 14 hour days, all work no play is not good for anyone ! 

  • Haha 1

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So everything works except the mph needle.  I'll post another vid of me running it around...  sounds like it runs rough at high rpms to me...

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So to me it sounds good low end but seems to race high end and sounds like it's about to fly apart...  looked online and turns out this is an ohv engine, not a ohc, so no timing or valve adjustments... 

also can anyone point me to a yt video on how to test the speed magneto on polaris bikes? This one and the one on the 500 are dead I believe, but this has also been partly rewired for the rad relocate... 

also it seems to be continually losing starting power to the starter as time goes on..  the battery reads 12v and 14.3v when running. But the starter struggles on the first stroke to turn the engine over..

Gonna be a learning curve to figure out the tps.. but I think your right ab it not being right as every once in a while it seems to not have power.  Also noticed it seems to lose power at high rpm.

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So the main issue now is the battery is really going dead.  I'm thinking it's the party that charges the battery? Forgot what it's called atm lol.  How should I check that?

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Voltage rectifier/ regulator .  There  may be a blown diode in the rectifier allowing the battery to  bleed back.  You  could  disconnect the  battery  and  charge it  fully..  Then  use   you  meter   set  on 10  amps  and connect the battery through it to the system and see if  it reads any  draw..  Don't  turn anythnig on  while doing that test . Leave the battery  disconnected overnight to  see if the battery itself is  discharging through a [possible internal  short.

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Awesome thanks! Looks like I'll be spending some time tomorrow running thru electrical on the bike...

I want to take an automotive electrical class at my community college this yr..  see if I can gain  some know how.. 

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      1991   Trail Blazer
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