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Old 05-27-2012, 12:51 PM
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Default 1982 YZ 490 wont start

Hello guys,

Im hew to the site. Now i had a few YZ125 and a YZ250 in the past. I found a 1982 YZ490 that i got started once on Friday and have been unable to get it going again? The air,spark,gas 40:1 and compression are good. She pops and smokes but wont start. any and alll help wanted
Thanks
Wreckingball
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Old 05-27-2012, 01:01 PM
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I'd take the carb off and give it a good cleaning. If it's got strong spark and good compression, that leaves the fuel delivery. I assume the timing hasn't moved.

Last edited by 87CR500Rider; 05-27-2012 at 01:02 PM. Reason: Added text
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Old 05-27-2012, 01:26 PM
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to my knowledge no but ill start with the carb and go from there. thanks. i might get my buddy to try a bump start. to check the timing
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Old 05-27-2012, 01:31 PM
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Was this a bike that had been sitting and you rescued it?
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Old 05-27-2012, 01:33 PM
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That is not uncommon with those bikes, I had one years ago and it always did that if you didn't kick it hard enough. You need to be sure you're starting from top dead center, and then JUMP on it with all you're worth. Good luck.
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Old 05-27-2012, 01:45 PM
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Quote:
Originally Posted by jbsleddin View Post
That is not uncommon with those bikes, I had one years ago and it always did that if you didn't kick it hard enough. You need to be sure you're starting from top dead center, and then JUMP on it with all you're worth. Good luck.
Good point. 2 of the 3 CR500s in my garage I own because the previous owners couldn't consistently crank them.
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Old 05-27-2012, 02:08 PM
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nope i bought off a guy who last ran it a month ago, i got it started there with 3 kicks and noting now just pops. i more than heavy enough + i probably sacked myself about 30 times in the last 2 days trying to get it started
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Old 05-27-2012, 05:38 PM
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Drain and replace your fuel, replace the plug, and try again. If nothing mechanically has changed, it is surely something minor that you're just overthinking and worrying about for nothing. Trust me, these bikes can be a real bastard to start, need consistent TDC kicks, if you are just kicking from anywhere in the stroke, you will get your @$$ handed to you before you know it. Could result in a trip to the hospital. TDC! That's about it.
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Old 05-27-2012, 07:07 PM
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made a video of what is happening maybe this will be more helpful [Only registered and activated users can see links. ]
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Old 05-27-2012, 08:51 PM
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The is definitely a technique to starting big bore two strokes...more than one. If you get a "choof" sound, you're close kick harder.

My method for cranking my CR500
1) Gas on
2) Choke on
3) 3-4 sissy kicks to prime cylinder
4) Get it to TDC and kick it hard and fast...it will light. Do NOT twist throttle while doing this.

Chances are, your foot is sore from kickin so you wont kick it hard and fast enough. It happens, I've been there. Another thing to consider beside looking at plug is kill switches.....they go bad and will hyjack any progress. Disconnect it and try again. Reeds if they're are worn and chipped will make starting a bear.

---------- Post added at 06:51 PM ---------- Previous post was at 06:11 PM ----------

Found this off CR500riders:
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Old 05-28-2012, 05:43 AM
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I was going to say, you need the proper footwear, but then you said it yourself. So that's number one mistake. Next off, your technique is bad, I only saw one or two of those kicks that started at TDC, and each time, your foot is slipping off the kicker in fear of getting kicked back. That bastard needs a full commitment, and the slipping of the foot will only cause you more harm in the long run. Trust me, I've been through this with my 85 CR500 the day I brought it home. My foot was so badly bruised I could barely walk. I felt defeated, but the following day, I wrapped it up really good, put my RIDING BOOTS on (after putting holes in the bottom of 2 pairs of work boots), and went back at it. The drill was already mentioned, but again: gas on, choke on, 3-4 full kicks not trying to start the bike, only to prime the cylinder with a fuel charge. Then find TDC, and JUMP on it following through to the bottom, the 490 needs all yer weight! Here's a vid of my 85,
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the "rocking" of the bike in gear is to prime the cylinder, only for video purposes to show a one kick fire up. I normally give the primer kicks, and it always fires on the first real kick. You may need a few days to let your foot heal up and get your confidence back, but don't give up on it. I've been there buddy, know what it's like!
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Old 05-28-2012, 01:30 PM
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foot feels like it got ran over
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Old 05-28-2012, 02:28 PM
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One thing I forgot to mention in my last post, in the video it looked as if your kicker was aluminum, if that's the case you have a kicker off a smaller bike and are losing a lot of leverage because of it. The 490 kicker is long and skinny, and is steel, not aluminum.
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Old 05-28-2012, 03:39 PM
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I know that went out today and ordered the original one from Yamaha -its B/O and about 150
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Old 05-28-2012, 07:16 PM
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Might want to keep an eye on E-Bay, that's where I found mine for $50 with the gear, if I remember correctly. I'm sure you're in a rush to have it running YESTERDAY (if you're anything like me, lol) but there are deals out there if you have a bit of patience. FYI, 465/490 use the same kicker, so you can broaden your search that way.
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Old 05-29-2012, 07:31 PM
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thanks i want it started 72H ago so i can tear up the trails
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Old 06-06-2012, 07:01 PM
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Did you ever get it started?
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