My Baby Won't Start - Please Help

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My Baby Won't Start - Please Help

Postby FlyKDXGuy » 12:48 pm Jan 07 2018

How's it going guys/gals.

I'm Jim, 26, from Delaware but living in Western Louisiana. I just made the leap from 4stroke bikes to 2 stoke with the purchase of a 97 KDX 200 - and I'm absolutely in love.

When I bought the bike, she was as reliable as they come - 3 kicks at the MOST on a cold day and we're up and riding, and it rides like a champ through every RPM range.

So this weekend, I take her to a nearby trail head to ride, and she starts right up as usual. I go on a quick 10 minute warm-up ride and at about 5 minutes I noticed a boot lace untied so I pulled off the trail, hit the kill switch, and fixed myself. When I try to start her, I get nothing. Engine turns but no feedback, pops, or sputtering, not even attempt to turn over. Before that, she was running better than ever.

I checked and I have good spark, fuel is flowing to the cylinder, and I have good compression. I'm thinking it's an electrical issue but could use a second opinion. Any thoughts, pointers, or expert opinions would be highly appreciated!
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My Baby Won't Start - Please Help

Postby thirdgenlxi » 01:10 pm Jan 07 2018

May want to double check that carb and make sure..... I had a similar thing where the bike was running like a champ, I shut it off to walk a section of really gnarly trail to figure a way up, and when I went back it wouldn't start. Turns out it had gotten a piece of dirt down in the bowl and clogged the pilot jet. Ever since I've been running an inline fuel filter

It also could be getting too much fuel..... possible worn float needle not sealing off or float height out of adjustment. If it's getting good spark then I wouldn't think it would be an electrical issue. But you may want to try unplugging your kill switch just to see..... they can go bad too, and at least eliminate that as a possibility

Also would probably check reed valves to make sure they're flat and flush, and not cracked

Does it feel like it still has good compression? You try a new plug already?
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Re: My Baby Won't Start - Please Help

Postby FlyKDXGuy » 01:29 pm Jan 07 2018

I appreciate the quick response!

I was thinking a faulty kill switch but I unplugged it and nothing changed. I'm also running an inline fuel filter and when I swapped my plug yesterday I did a quick compression check and it felt sealed and strong when I cranked it. I did notice my old plug had weak spark and a little carbon buildup to the point where I thought it was a fouled plug but the quick swap didn't do anything.

But I'll try leaning the mixture a bit to see if it's getting too much fuel.
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My Baby Won't Start - Please Help

Postby SS109 » 02:41 pm Jan 07 2018

Yeah, I would have checked the kill switch first. Since you tried that, I would follow thirdgenixi's advice. Hopefully you'll find it quickly.
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Re: My Baby Won't Start - Please Help

Postby Jason » 04:17 pm Jan 07 2018

Welcome to kdxrider.

Sounds like an odd problem to happen after stopping. Crazy.
Thank you, Julien D for all your hard work!

PLEASE! Do not "dip" PWK Keihin carbs in Berryman's to clean them! It will damage the internal o-ring (jet block gasket).
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Re: My Baby Won't Start - Please Help

Postby doctord23 » 05:12 pm Jan 07 2018

It is a stretch, but check the woodruff key that holds the flywheel in the correct alignment.
I've had them shear before and throw the spark timing off.
Result = no start
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Re: My Baby Won't Start - Please Help

Postby FlyKDXGuy » 10:11 pm Jan 07 2018

Jason wrote:Welcome to kdxrider.

Sounds like an odd problem to happen after stopping. Crazy.
I appreciate it. But yeah man, it has me stumped at the moment

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Re: My Baby Won't Start - Please Help

Postby FlyKDXGuy » 10:22 pm Jan 07 2018

doctord23 wrote:It is a stretch, but check the woodruff key that holds the flywheel in the correct alignment.
I've had them shear before and throw the spark timing off.
Result = no start
I still haven't figured out the issue yet so I'll inspect the the key tomorrow. I appreciate the suggestion, timing completely slipped my mind.

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My Baby Won't Start - Please Help

Postby Chilly » 02:32 pm Jan 08 2018

I just had this similar issue but I was at the truck when my bike wouldn’t start back. I found that my flywheel was rubbing one side of my coil and burned it up. The bolt hole in my coil end was just a bit big and it had just enough play where it could be moved up or down. It was a Ricky Stator coil. If you haven’t already I would purchase the online manual provided. It’s very very detailed and makes troubleshooting easy.
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My Baby Won't Start - Please Help

Postby Chilly » 02:34 pm Jan 08 2018

I just had this similar issue but I was at the truck when my bike wouldn’t start back. I found that my flywheel was rubbing one side of my coil and burned it up. The bolt hole in my coil end was just a bit big and it had just enough play where it could be moved up or down. It was a Ricky Stator coil. If you haven’t already I would purchase the online manual provided. It’s very very detailed and makes troubleshooting easy.
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My Baby Won't Start - Please Help

Postby JoKDX220r » 04:28 pm Jan 08 2018

If you didn't check it already, make sure your silencer is not "plugged". If something is blocking the exhaust it will never start.
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Re: My Baby Won't Start - Please Help

Postby bzdang » 06:39 pm Jan 08 2018

I think you were caught in the unwarm-zone. Five minutes into a warm-up ride in cool weather (~60F) the engine may not yet have been hot enough for a regular no-choke start, and might or might not have responded well to using the choke either. What to do? A kick or two with choke on for some cool-start enrichment, but no more than that, and be ready to nurse it if it lights up.
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Re: My Baby Won't Start - Please Help

Postby Skoalman » 06:52 pm Jan 08 2018

When's the last time you cleaned your air filter?
Last edited by Skoalman on 06:58 pm Jan 08 2018, edited 1 time in total.
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My Baby Won't Start - Please Help *UPDATE*

Postby FlyKDXGuy » 06:53 pm Jan 08 2018

Alright guys! Finally had success!

I ran through and double checked a few things and when I added some mix directly into the cylinder and threw up the choke, she started right up like nothing ever happened. No idling problems or any other issues that I noticed, purred like the lion that she is hahaha

Any ideas on what would cause this?

I super appreciate the input from everyone.
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Re: My Baby Won't Start - Please Help

Postby FlyKDXGuy » 06:54 pm Jan 08 2018

Skoalman wrote:When's the last time you cleaned your air filter?
I noticed it was a bit dirty, so I have new filter cleaner and oil on the way!

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My Baby Won't Start - Please Help

Postby canamfan » 10:48 pm Jan 08 2018

I think bzdang had it right, it may have needed the choke to start or there's an old trick, try leaning the bike over, almost sideways for 5 seconds or so, this floods the carb and when you stand it back up that excess fuel flows into the cylinder. You might think this would foul out the plug but in cold weather sometimes a bike needs the extra fuel to light off. It has worked for me numerous times, when the choke did not provide a rich enough mixture.
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Hmmm...

Postby FlyKDXGuy » 12:59 am Jan 12 2018

Problems persist...

To get the bike started, I have to give it full throttle with the choke on but once it's on, it sputters like all hell when idling. Which the bike just refuses to do by itself because as soon as I lift off the throttle, the rpm drops to shut-off - doesn't attempt to keep running.

I've cleaned the pilot, restored the idle screw back to factory setting, new plug, fresh mix, cleaned the air filter.

Any ideas?
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Re: My Baby Won't Start - Please Help

Postby FlyKDXGuy » 01:12 am Jan 12 2018

FlyKDXGuy wrote:Problems persist...

To get the bike started, I have to give it full throttle with the choke on but once it's on, it sputters like all hell when idling. Which the bike just refuses to do by itself because as soon as I lift off the throttle, the rpm drops to shut-off - doesn't attempt to keep running.

I've cleaned the pilot, restored the idle screw back to factory setting, new plug, fresh mix, cleaned the air filter.

Any ideas?
Video attachedhttp://cloud.tapatalk.com/s/5a5851ae8e710/20180112_000133_1.mp4

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My Baby Won't Start - Please Help

Postby thirdgenlxi » 02:17 am Jan 12 2018

Hmmm..... but it ran fine when you poured some mix directly into the cylinder?

It still sounds carb related to me. Have you done a jet block gasket at all? Did you check your reed valves? Or like someone else mentioned above, timing could be off too (sheared flywheel keyway)

I can't get the video to work, btw
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My Baby Won't Start - Please Help

Postby SS109 » 08:26 pm Jan 12 2018

Maybe I missed it but did you check fuel flow through the petcock?
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