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02-25-2011, 09:34 PM
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Junior Member
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Join Date: Oct 2010
Posts: 18
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Put a new ex cam in today from bcs and starts like a dream also put the old ex. cam in the in. side. More torque little less top end. Should be great for woods.
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02-26-2011, 05:55 PM
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Senior Member
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Join Date: Dec 2008
Posts: 903
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Well that’s interesting! These hot/cold start issues have been baffling me a while, we seen a number of them pop up. I’ve come to the conclusion they are either electrical or mechanical.
The Ambient Air Pressure and Temp Sensor(AAPTS) or Coolant Temp Sensor(CTS) share some harness splices and grounds to the ECM, so there is a potential there I think we have seen in harness faults, where I believe either the signal is faulted to ground or bad pin connector(s), or bad AAPTS/CTS making the ECM go into a overheat/freeze no start fault mode preventing hot or cold starts. I think if we see both hot and cold start issues, chances are better there is an electrical fault, not to exclude the decompressor. The ticking noise seems to be indicative of a bad decompressor, all I can figure is when it is hot(the assy), or does not put as much load on the motor vs. cold as in this case above, it allows hot starts but not cold unless maybe more cranking amps from a charger are applied.
There is no fault code I can find for a bad decompressor, couple that with the harness/sensor possibilities and as we can see the fault can be real difficult to find. BUDS/engine light off should help eliminate the stock harness/sensors, no code no fault leaning more toward the decompressor.
Thanks for letting us know what the problem was, it has helped me understand this a little better. J
Terry Portier
Last edited by TNT; 02-27-2011 at 01:18 PM.
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05-17-2011, 06:23 PM
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Senior Member
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Join Date: Feb 2010
Posts: 161
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It looks like you got the same problem as I do. Can you tell me if it was cranking like that :
Thanks!
__________________
-= DS450X MX 2009 =-
"Go Big or Go Home!"
Special thanks to :
E-Sticky Graphics, Sinto Racing, Goudreau Solution Mécanique, Slel Moto Suspension, Contour and Smith Optics!
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05-17-2011, 06:30 PM
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Moderator
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Join Date: Dec 2009
Location: Tampa FL
Posts: 749
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That sounds like the decompression release is sticking shut
__________________
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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05-17-2011, 09:08 PM
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Senior Member
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Join Date: Feb 2010
Posts: 161
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So, I've tried tonight to put an heat gun for 15 seconds on the decompressor and guess what : cranked like a charm!! I still had my old decompressor and spring which I took off from my other exhaust cam. I've replaced the spring, gave a little knock on the decompressor pin just to deplace it a little bit : tried 2 times at cold tonight and was cranking perfectly!! Thanks for the help!
__________________
-= DS450X MX 2009 =-
"Go Big or Go Home!"
Special thanks to :
E-Sticky Graphics, Sinto Racing, Goudreau Solution Mécanique, Slel Moto Suspension, Contour and Smith Optics!
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05-17-2011, 10:46 PM
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Moderator
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Join Date: Dec 2009
Location: Tampa FL
Posts: 749
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GREAT!!
glad to hear it !
__________________
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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08-03-2011, 07:52 AM
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Member
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Join Date: Jul 2011
Posts: 42
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Hey guys, I think I have the same problem. The only diference with the video is that my quad does a clicking (electrical) sound when it stops, It does not keep turning slowly. I've tried heating with a hair dryer and it cranks right up. So, I think its the decompressor, do you know where I can get just the decompressor pin, lobe and spring? I don't want to change the whole cam..
By the way, I used a 20-50 Oil in my last oil change, can this be the reason also?
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2008 can am ds 450 not starting, 2008 can am ds 450 won't start, air temp sensor, can am ds 450 ticking from top end, can am ds 450 x wont start, can-am not starting, canam wont start, counter balancer, decompressor on ds 450, ds 450 cold clicking no start, ds 450 decompressor noisey, ds 450 not start at cold temp, ds+450+no start, ds450 timming, ds450 will not start electrical clicking sound, how to clean the brushes on ds 450 starter, starter, timing mark, wont star, wont start
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