COMPLETELY STUMPED 2013 YZ450f

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11/5/2017 8:08 AM

I have a 2013 yz450f that I’ve just installed a wiseco pro lite piston and rings stock 97mm bore into and I’m have trouble getting it started. The bike ran great before he rebuild, it was for maintenance because I was blowing a little blue smoke/oil out of the exhaust as it was running. Anyway, Piston went in just fine, installed all new gaskets, set it in time correctly, and put it all back together. Went to start it and has great compression, good spark, and seems to be getting fuel and air well. But it still doesn’t even attempt to start. I’ve kicked hundreds of times to no success. Every 10 kicks or so it will pop loudly as if backfiring and shoot a blue flame out of the exhaust about 5 inches long. Can anyone tell me what’s going on?

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11/5/2017 9:16 AM

Valve timing is off by a tooth

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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

11/5/2017 11:59 AM

I did this once on a rmz 250. Essentially the crank mark is in the correct spot two times per cycle. It is during in the wrong place. Rotated it around to the next cycle and started up just like supposed to.

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11/5/2017 2:36 PM

Check the wear on your cam chain too...once they stretch out, you sometimes have probs starting them after a rebuild.

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Many thanks to everyone helping me out this GNCC season: SRT Offroad, Acerbis, FCR Suspension, O'Neal Racing, Evans Waterless Coolants, Rekluse, Twin Air, Braking Brakes, Carbsport

Profile image credit Ken Hill Photography

11/5/2017 6:08 PM

I believe my cam chain is in good shape, I looked at a few other sites and they’ve said for this particular bike (2010-13 YZ 450f) there is a straight up and down mark that indicated TDC, and then another flat mark that you go by to time it. It’s 26 degrees ahead of TDC I suppose because of the head being reversed? I tried this mark and it feels better to kick and never backfired, but still does not run. It’s getting good spark and the fuel pump is working.

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11/6/2017 7:14 AM

nick32456 wrote:

I believe my cam chain is in good shape, I looked at a few other sites and they’ve said for this particular bike (2010-13 YZ 450f) there is a straight up and down mark that indicated TDC, and then another flat mark that you go by to time it. It’s 26 degrees ahead of TDC I suppose because of the head being reversed? I tried this mark and it feels better to kick and never backfired, but still does not run. It’s getting good spark and the fuel pump is working.

If it's like any other motorcycle (and I think it is) you time it on TDC. The other timing mark is for ignition timing before TDC.

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Take it to the limit, one more time!

11/6/2017 7:21 AM

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Here is a good link for you to look at.
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Take it to the limit, one more time!