1999 900 won't start after low-speed wreck - Honda Motorcycles - FireBlades.org
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post #1 of 13 Old 07-25-2011, 12:24 AM Thread Starter
 
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1999 900 won't start after low-speed wreck

I've got a '99 900RR that was in tip-top shape until I wiped out in my front lawn (grass was wet, I was stupid, my dad was watching from the living room couch, it was awesome). I was only going about 7 mph but managed to break the brake lever, windshield, and crack a couple fairings. Immediately afterwards the bike would start but sounded like it was only running on 2 cylinders or starved for fuel or...?

That gradually turned into not starting at all. It turns over and it sounds like it's trying to start, but never grabs.

So now I've got it in my garage, partially disassembled, and am trying to diagnose the problem. I've verified the following:

1. Fuel flow from the gas tank. I hooked 6' of fuel and vacuum line to the tank sitting on a bench and when I run the starter I get fuel coming out all the way to where it branches out into the carbs.

2. Spark. Hooked a new spark plug to each wire, grounded to the frame, verified that I get a nice spark

3. Alternator. Nothing's knocked loose inside, stator and everything look good.

4. Pulse generator. Again, nothing knocked loose inside.

5. Vacuum. I've gone over all 30' of vacuum hose and don't see any obvious leaks.

Any tips are greatly appreciated. I don't even mind if you poke fun at the fact that I wiped out in my front lawn. I've got a Clymer's but it seems to be kind of half-assed, can anyone also suggest a better manual?

Thanks!
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post #2 of 13 Old 07-25-2011, 5:08 AM
 
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Re: 1999 900 won't start after low-speed wreck

There will be a Crash cut out switch somewhere, probably in the front behind the clocks but sometimes they are by the battery. Just check it out for connections and that it is the right way up!
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post #3 of 13 Old 07-25-2011, 5:16 AM
 
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Re: 1999 900 won't start after low-speed wreck

In addition to what Iíve just posted, and after rereading your symptoms. if you have fuel to the carbs and a spark, its got to go! Check the battery voltage charge it if necessary or jump it with a car battery, I would have thought it will start; it just might need a good long pull!
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post #4 of 13 Old 07-26-2011, 1:26 PM Thread Starter
 
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Re: 1999 900 won't start after low-speed wreck

Thanks for the tip, I went over the whole bike and it seems that mine doesn't have a tipover sensor. It's not referenced on the wiring diagram either??

Tonight I'm going to pull the plugs and replace them, I only verified spark with a new plug jammed into the wire. Reading around this site it looks like fouled plugs can bring a 900 to its knees pretty easily?
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post #5 of 13 Old 07-26-2011, 2:41 PM
 
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Re: 1999 900 won't start after low-speed wreck

Plugs could be a problem.

Check that your Neutral switch, clutch switch and kickstand switch are all functioning properly, they'll all keep her from running.
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post #6 of 13 Old 07-26-2011, 2:58 PM Thread Starter
 
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Re: 1999 900 won't start after low-speed wreck

Will do, thanks. I pulled the sidestand switch and cleaned off all of the chain grease, nothing looked obviously wrong.

How do those interlocks work, are they supposed to keep the starter from running or do they kill the spark?
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post #7 of 13 Old 07-26-2011, 3:12 PM
 
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Re: 1999 900 won't start after low-speed wreck

The clutch/Neutral switch will prevent the starter from spinning. I think the stand switch kills spark.
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post #8 of 13 Old 07-27-2011, 4:31 AM
 
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Re: 1999 900 won't start after low-speed wreck

Also 'kill switch' stops the spark but allows starter to turn. that's fooled many in the past!

Plug gaps need to be right.
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post #9 of 13 Old 08-03-2011, 2:07 AM Thread Starter
 
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Re: 1999 900 won't start after low-speed wreck

Okay, heres an update. I got it to start again by replacing the plugs with brand new. I have a new-found respect for the term "fouled plugs". Now, however, I'm back to the first square. It starts, idles, responds to choke, but when I hit the throttle it dies. Even if I roll the throttle open slowly it wont rev up.

So to summarize, prior to the wreck it was working great. After the wreck I get this symptom. Any hints?

Thanks!
Jeff
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post #10 of 13 Old 08-05-2011, 9:08 PM
 
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Re: 1999 900 won't start after low-speed wreck

Find out anything yet? Im curious. Please post results.
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post #11 of 13 Old 08-05-2011, 9:14 PM Thread Starter
 
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Re: 1999 900 won't start after low-speed wreck

Yes. After replacing the plugs and idling it via choke for about 20 minutes, now it runs beautifully. So, again, I think I just waaaaaaaaaay underestimated the effect of fouled plugs.

For posterity, when I initially pulled the old plugs they were wet, but also had little "whiskers" of carbon kind of nested around the center electrode. I cleaned them with wire brush but didn't sand them.

A few fiberglass patches and a new windshield and I'm back in bizness!

JL
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post #12 of 13 Old 08-05-2011, 10:29 PM
 
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Re: 1999 900 won't start after low-speed wreck

did u check the fuel pressure regulator?
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post #13 of 13 Old 08-05-2011, 10:42 PM
 
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Re: 1999 900 won't start after low-speed wreck

Quote:
Originally Posted by knottu812 View Post
did u check the fuel pressure regulator?
I dont think carbed bikes have a fpr.
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