Temp below 60 will not start, starter turns over, but the engine doesnt fire

There needs to be fuel, air, spark and compression. It may not start with starter fluid if it's already flooded. It may not start if a valve is stuck open.
You can take the sparkplug out and check to make sure it's not got excess fuel. Plug should be dry.

renew spark plugs,mix up some fresh fuel,put choke on,throttle set at just above idle,pump up fuel bulb by hand till tight,put outboard in a water drum,try pulling or turning on starter till it fires,then push choke in and restart

Fill with correct fuel/oil mix. turn switch to I. Pump primer bulb 4-5 times. Turn choke on. Pull starter until engine fires. Turn choke off. Pull Starter until engine runs & allow to warm up for 10 secs before trying to engage throttle. If it doesn't start after 3-4 pulls with no choke then try same sequence again. May have to use 1/2 choke after engine fires. If it still won't start then something is wrong with it & it will need to be checked by a service agent.

You need to explain a little better... do you mean it will only crank properly when the choke is open and the throttle is closed ??? Has the battery been properly charged and tested ??? ( be honest here because we can't help if you don't ) are the battery cable connections is good shape ??? Have you tried spraying some carb cleaner into carbs when cranking ??? I have the same engine on my Triumph

Start with fresh gas and a new spark plug.

Then follow theses steps.
1 Turn ignition on
2 If equiped with a primer, prime it a couple of times
3 Turn to full choke
4 Set the throttle lock to full throttle
5 With short quick pulls try to start
6 when you hear the engine fire shut the choke off
7 A couple of more pulls it should fire
8 If it stalls start over from step 3

Good Luck

The chainbrake should be activated when starting the chain saw. Activate the chain brakeby pushing the front hand guard forwards.b>Cold engine Start position, 1: Set the start/stop switch in the choke position by pulling thered control outward - upward.Decompression valve: Press the valve to reduce the pressure in the cylinder and makestarting easier. Once the machine has started the valve will automaticallyreturn to its original setting.Air purge: Press the air purge diaphragm repeatedly until fuel fills thediaphragm (at least 6 times). The diaphragm need not be completely filled.Grip the front handle with yourleft hand. Hold the chain saw on the ground by placing your right foot throughthe rear handle.Pull the starter handle, 4: Pull the starter handle with your right hand and pull out thestarter cord slowly until you feel a resistance (as the starter pawls engage)then pull firmly and rapidly until the engine fires.Push down the red choke control: As soon as the engine fires which can be heard through a"puff" sound, push down on the red choke control.Pull the starter handle (6): Keep on pulling the cord powerfully until the engine starts.

The choke actually just opens the throttle bodies a little (the bike is fuel injected). Try using putting on the 'choke', then pressing the start button, but dont touch the throttle. Does it start ok? Also, when started, if you use the 'choke' does it increase the engine speed? If it does not, then you need to set it up correctly.
Let us know how you get on.

How to use your choke correctly. The choke is only to be used for starting a cold engine. If it is a lever, usually you pull it up for on , and push it down for off. look for some type off arrow, or up & down. To start your cold engine, turn on fuel tap, give full choke, turn key on and press starter or kick start, it is very important that you do not use the throttle while starting with the choke, just turn the key on, and press the starter with full ckoke, and no throttle. Once the bike fires and starts, turn down the choke a little and find a idle, after a few minits, you can turn off the choke and ride off. The use off the choke is only for starting a cold engine.

does the engine turn over. If it does turn over, is it slow. If it does turn over, it could be the coil not firing, or no gas getting to the throttle body. Spray a little starter fluid in the throttle body and try to start the engine, see if it fires off at all with starter fluid. These are simply done, just hope it's nothing major. Give a little more detail about what it is doing.

(Manual Choke) Make sure that when the choke plunger is fully pushed IN (e.g. choke off) - that the choke cable is actually slack, if it is still tight then adjust the cable till there is a little bit of slack with the plunger pushed in.
(Auto Choke)Have you tried blipping the throttle, just give it a guick stab when it's warmed up and running, be quite sharp and deliberate with the throttle, this usually cancels auto-choke if it's working properly.
if not...
try setting the idle screw on the throttle body when the engine is hot, unscrew the screw to get the desired idle speed, then let it cool (fully cool) and see if it still starts and warms up ok with the new lower setting, either problem solved or back to square 1.. (reset the idle screw back to original setting, good idea to make a note of how far you unscrewed the screw in the first place :-)
check the accelerator cable(s) are not too tight, could be holding the throttle open slightly.
check the air filter/box to see if it is clogged... clogged filter=rich mixture...
Have the engine temp/air temp/oxygen sensors (if applicable) checked out at a garage, they could be causing problems also, but are £20-60 each, if one is faulty dont get bummed for labor charges, a temp sender is a bolt with a connector on it, fit with a ring spanner in 15 seconds, just get the garage to show you which one is broken first (just so you know ;-) then when they "offer to fit it for you" just ask for the part and fit it yourself - turns a £100 job into £20-60 job.
let me know how you get on. (The Engine Guy)
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Just check through everything in roughly this order, starting with "free" "easy" and moving onto "£20 - £60" - "annoying and niggly" - hopefully you get if fixed near the top of the list!
thinking... this is a great thumping engine - Are you using the correct grade fuel, try premium (97RON or better) if you've been on regular (95RON), some engines just don't like weak fuel especially big bike and performance car engines.