Somebody help! 2008 TC 510 is driving me crazy

My 2008 Husqvarna TC 510 motocross bike has been having difficulty starting. After 50 kicks I give up. I put it back in the garage and the next day it starts right up. It occassionally back fires or kicks back when I'm trying to kick it over. Once it's running it keeps on running. It's only inconsistant when I'm starting it, warm or cold.The carb has been cleaned, spark plug and wire changed, fuel cap vent checked, valves checked, leak down test, ground wire checked.
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I've owned it since new. When new it started easily in a few kicks, and it did need a few blips of the throttle and choke. Because of it kicking back, I stopped giving it any gas, but I still choke it. It behaves like it's flooded. When I shut off the fuel supply and let it sit for a few hours, it may start in a few kicks. The next day I will turn on the fuel supply, choke it and after 50 kicks I give up. I'll pay attention to what I do to see what works and what doesn't.

It is almost impossible to start it sitting on the bike; you need to have it on a stand or have someone hold it up in order to get a good kick.

Your auto-decompressor actuator is warn out. Replace it and life will be good.

It doesn't have one, it's manually operated on the handle bar.

Replace the idle jet, over time, it will develop a layer of varnish and reduce the jet size considerably.

You might want to research that. I'm pretty sure all 510 models have the auto-decompression as well as the manual release. In my experience( have replace 3 on my 05) the bike started up perfectly after each replacement.

When I picked up the bike new from the dealer I was shown how to start it. It was a matter of finding tdc, pull the leaver and just nudge it past tdc and give it a kick. It would start right up. My friend has the TC450 with both auto and manual, for some reason mine only has manual.

if all the above is covered=- float height

I found the adjusting screw at the bottom of the carb open 1.5 turns which is correct for the 250. I opened it 2 turns which is correct for a 510 and the bike started right up. I don't know if it's one of those days where she just wants to start. I'll see if it starts tomorrow.

Today I repeated what brought me success in starting the TC510 yesterday but today she wouldn't start at all. Back to square one.

The 2008 TC 510 only has the manual decompressor; but could it also be causing my starting problem. What goes wrong with the decompressor that causes the starting problem? It functions as it should, it allows me to pass TDC to kick it over. I find that it may have less compression when I kick it over; could that be a sign of the decompressor acting up? I'm reaching the point where I feel like just piecing the bike out.

I hear you.....this is crazy. I can't confirm whether or not the bike came with one. However I just can't believe it doesn't have one.

So have you popped open the valve cover and looked for a little doohickey that looks like this on the right side of the camshaft? If your bike doesn't have one of these, the chances of starting it are overwhelmingly against you. There's just no way you'll get the proper spin out of that high compression motor in order to fire it up. If you do have that doohickey, replace it.

The 2009 TE 450/510 have it, not the 2008 TC 510's, just manual.

Have you done this Paul ↓ ?

Not yet, that's my next step.

pretty sure your tc has an auto decomp device on the exhaust cam as has been mentioned, and I think it should be looked at .what wears is the nub on the bottom.i think xriderdown is on to something here.dan

Another thing to look at is the condition of your intake manifold. does it show visible signs of cracking?dan