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post #1 of 3 (permalink) Old 05-23-2019, 04:16 PM Thread Starter
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09 polaris sportsman 90 issues

I got it for my daughter a while back and it sat. Now we bought a new battery and it wont electric start-we have to jump it from a car battery even with buying a brand new battery--would a new starter fix this? All the lights are unhooked.
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post #2 of 3 (permalink) Old 05-24-2019, 06:08 AM
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Location: Lena, IL
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Is the new battery hooked up properly? Check the connections first and I have learned over the years that new doesn't always mean good so I would test the battery too.

Mine: 2018 Sportsman 850SP - 26" Bear Claw HTRs on OEM steel wheels(I really don't like the Aluminum ones)
Polaris Hand warmers, Mirrors.
Hers: 2007 Sportsman 500 EFI, Polaris Winch, 26" Bear Claw HTRs on Moose 427x Wheels. QSC Clutch Kit, Hand Warmers
2001 Magnum 325 MOSE 12" rear wheel conversion. 25" Sedona Coyote tires
2001 Magnum 325 Warn winch and Moose 60" plow
2017 Polaris Ranger 1000XP - Roof and front glass
SOLD 2004 Sportsman 600 Twin
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post #3 of 3 (permalink) Old 05-24-2019, 06:16 AM
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Location: Illinois
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New batteries can be defective - that's why they have a warranty.

If it will start by jumping, it's probably one of a few things:

First, I would check the valve clearance - the valves will tighten up over time and need to have the clearance reset to prevent a drop in compression which leads to hard starting.

Second, if the difference is cranking speed is noticeable when jumping, it might just be a weak battery - was the new battery properly activated? An AGM battery should be filled with the supplied acid, let stand for 20 to 60 minutes before being connected to an automatic charger and charged at appx. 1.25 amps (depends on the battery AH rating - a 14 AH battery should not be charged above 1.4 amps and a 10 AH battery should not be charged above 1 amp). After charging, the battery should be allowed to stand for at least 1 hour and then the open circuit voltage checked (12.8 volts is nominal) before installation.

Third, if the starter motor gets hot quickly, then it's perhaps a bad starter motor. The starter motor should not be run more than 5 seconds at a time or more than 30 seconds total without letting cool for 30 minutes. If the starter motor has a high current draw, then it may need replaced. Connect an volt meter across the battery terminals - if the voltage drops below 10.5 volts when the starter motor is running, either the battery is weak or the starter motor needs replaced.

2006 Trailboss 330
2002 Sportsman 90
2005 TRX400EX (FOR SALE)
2003 LT-Z400 (needs engine work & is for sale)
2004 CRF250X
1971 Triumph 650 Bonneville (has 5 original miles)
1972 Triumph 650 Bonneville (undergoing restoration)
1979 Honda CBX (6 cylinder)
1970 Kawasaki G3SS 90cc Bushmaster
1976 Suzuki RE5 Rotary (not running & FOR SALE)
1981 Kawasaki KZ305-A
1981 Suzuki GS450T (undergoing repair & will be for sale when done)
1982 Kawasaki KZ750-H (FOR SALE)
1989 Honda VT1100C
2007 Vectrix VCTX Electric Scooter
1965 Montgomery Ward 3 1/2 HP Tecumseh Mini Bike
1970 Triumph T25 250cc Trailblazer
1968 Triumph 250cc Flat Tracker

Shop Owner and Mechanic with over 50 years experience
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