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02-08-2011, 05:37 PM
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Junior Member
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Join Date: Oct 2010
Posts: 18
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wont start
i have a 09 ds 450. i have bcs harness, 50mm body, green injector..it had a can am harness, it wouldnt start cold and i thought that was the problem so i bought the bcs harness..it ddnt help. so i got a new battery. it still wont cold inless u hook it to a battery charger. it will just roll very slow and tick. it runs great once u get it good and hot and will start as long as it doesnt cool down much..can some one please tell me what im doing wrong 
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02-08-2011, 05:42 PM
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Senior Member
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Join Date: Jul 2010
Location: Phoenix, AZ
Posts: 518
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do your valves need adjustment, hard starting in the cold when your valves are out of adjustment, will run fine when warm
__________________
2008 450x
motoworks exhaust
BCS intake w/ K&N filter
a/c six pak rack
blingstar bumper
BCS inline cooler
itp sand stars w/ C series sport rims
2010 Polaris Ranger 800 EPS
Todd's Custom Billet Full Roll Cage
Aluminum Powder Coat Matched Top
BS Sand Rear 52" Color Matched Seat
Six 4 point Crow harnesses
Fully Street Legal
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02-08-2011, 05:46 PM
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Junior Member
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Join Date: Oct 2010
Posts: 18
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no sir.. just had the cover off and started to do the cam mod but changed my mind. valves were in spec
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02-08-2011, 06:00 PM
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Junior Member
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Join Date: Oct 2010
Posts: 18
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no sir.. just had the cover off and started to do the cam mod but changed my mind. valves were in spec
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02-08-2011, 06:24 PM
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Moderator
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Join Date: Dec 2009
Location: Tampa FL
Posts: 749
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I would like to know what the compression is when it is cold.
does it sound like it is turning over fast enough , or is it too slow to allow it to fire?
__________________
My son is a proven ATV MX champion rider
2009 Can-AM DS 450 XMX, Fox evol 2 fronts and fox rear, Custom motor by Williams ATV performance, motoworks exhaust , BCS intake..
2008 DS 450 Frame: removed all Rivets, modified front frame pieces,BCS frame support kit, replaced all bolts with metric fasteners,ENGINE: Custom Engine build by Williams ATV Performance, BCS intake,SR4G2,x factor nerfs and heels, PEP custom front and rear,Holz A-arms BRP race pkg
more every week 
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02-08-2011, 06:58 PM
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Junior Member
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Join Date: Oct 2010
Posts: 18
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seems like it turning too slow to fire unless you put on the charger with it all the battries act the same so i know thats not the problem
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02-08-2011, 09:15 PM
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Moderator
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Join Date: Dec 2009
Location: Tampa FL
Posts: 749
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take out a spark pplug and see if it goes alot faster ?
__________________
My son is a proven ATV MX champion rider
2009 Can-AM DS 450 XMX, Fox evol 2 fronts and fox rear, Custom motor by Williams ATV performance, motoworks exhaust , BCS intake..
2008 DS 450 Frame: removed all Rivets, modified front frame pieces,BCS frame support kit, replaced all bolts with metric fasteners,ENGINE: Custom Engine build by Williams ATV Performance, BCS intake,SR4G2,x factor nerfs and heels, PEP custom front and rear,Holz A-arms BRP race pkg
more every week
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02-08-2011, 09:24 PM
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Senior Member
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Join Date: Jan 2009
Location: Florida
Posts: 161
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I've had this problem a couple of times. I am 99% sure you need a new battery. You will think your battery is ok, but these bikes need brand new condition batteries to start and run.
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02-09-2011, 02:04 AM
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Senior Member
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Join Date: Sep 2009
Location: Iowa
Posts: 141
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Quote: Originally Posted by cook78ltr
I've had this problem a couple of times. I am 99% sure you need a new battery. You will think your battery is ok, but these bikes need brand new condition batteries to start and run.
+1. Sounds like a battery that has lost some cells. Cells that wont hold a charge (from a just running bike) more than a few minutes.
Or,... check, tighten, and clean with a wire brush, all your connections at the battery, at the solenoid, and at the chassis ground. Corrosion can call all kinds of wonky effects from the starting system.
Let us know what the end fix was.
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02-09-2011, 09:21 AM
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Junior Member
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Join Date: Oct 2010
Posts: 18
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the battery is brand and passes a load test and it does roll faster with the plug out all the wiring was just put on monday so all the plugins are clean
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