93 F2 Cleaned Carbs and Now It's Not Starting? - Honda Motorcycles - FireBlades.org
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post #1 of 10 Old 08-06-2017, 6:07 PM Thread Starter
 
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93 F2 Cleaned Carbs and Now It's Not Starting?

Hey all,

I'm posting here again in need of some guidance! I was cleaning my neighbors carb on his mower and decided "eh what the hell I'll clean my bikes while I have air in the compressor". Now that it's all clean, I can't get it to start without spraying some carb cleaner down the carbs and it'll run for a moment then shut off (understandably).

Here are the facts:

• The bike ran perfectly fine, although a little rich which is why I replaced the sparkplugs since they were wet fouled.
• The only things I removed were the bowl and... that's it. I merely wanted to shoot air through the holes of the carb since I had a dead spot at 4-5k rpms and assumed it would be a clogged jet.
• After spraying carb cleaner it ran for a few seconds, but I heard a loud POP on the most recent one. I checked for smoke or leaking anywhere and was okay so I cranked it again and it started, but died after a second again.
• I've cranked it a good 30 seconds total at LEAST. And I see some gas from the carb by loosening the flathead. Is this not enough time? Maybe it's just shy of enough cranks?

So my understanding is I have gas, spark, and to my knowledge compression seeing how it ran like a champ before I cleaned the carbs. It hasn't had a full battery yet, so I have that on the tender as I'm typing right now in hopes that with enough cranks it'll get the gas back into the motor.

Please! Any advice would be appreciated!
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post #2 of 10 Old 08-06-2017, 6:21 PM
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Re: 93 F2 Cleaned Carbs and Now It's Not Starting?

When you say flathead, do you mean the float bowl drain?

It will take a good while for the fuel to reach the carbs because it's fed by gravity and the vacuum of the engine opens the fuel valve. Make sure that system is properly hooked up after you took it off.

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post #3 of 10 Old 08-06-2017, 8:06 PM Thread Starter
 
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Re: 93 F2 Cleaned Carbs and Now It's Not Starting?

Yup, the float bowl drain. I turned them out a hair to see if gas started dripped out and there was. Still on the tender and cranked it maybe 20 more seconds total in the past hour and still no avail. When I leave it alone for an hour though, it will start for a second then continue to crank. Not sure what my next course of action should be. I feel it's taking off the carbs again, but I'm not sure if there's anything else I can check.

I've made sure the vacuum line was hooked up, killswitch set to run, petcock hose connected, set to reserve... trying to remember if I'm leaving anything out. I'm running 20W-50 right now since it's summer it hasn't been hard to start, but since it's getting a little colder in my area maybe I should change it to 10W-40 for easier cold start?
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post #4 of 10 Old 08-06-2017, 9:47 PM
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Re: 93 F2 Cleaned Carbs and Now It's Not Starting?

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Yup, the float bowl drain. I turned them out a hair to see if gas started dripped out and there was. Still on the tender and cranked it maybe 20 more seconds total in the past hour and still no avail. When I leave it alone for an hour though, it will start for a second then continue to crank. Not sure what my next course of action should be. I feel it's taking off the carbs again, but I'm not sure if there's anything else I can check.

I've made sure the vacuum line was hooked up, killswitch set to run, petcock hose connected, set to reserve... trying to remember if I'm leaving anything out. I'm running 20W-50 right now since it's summer it hasn't been hard to start, but since it's getting a little colder in my area maybe I should change it to 10W-40 for easier cold start?
Ok, wanted to make sure it wasn't the air/fuel screw.

The oil isn't going to make a difference in the starting issue. Something isn't right from your carb clean. I'm guessing that just blowing the air in the passages has actually clogged something up. Remove them, disassemble them, clean them properly, then reinstall and test.

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post #5 of 10 Old 08-07-2017, 2:58 AM
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Re: 93 F2 Cleaned Carbs and Now It's Not Starting?

This problem has been reported after an ultrasonic clean, the carbs look spotless but the bike won't run, often small pieces of debris have been dislodged and are clogging up the jets.

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post #6 of 10 Old 08-07-2017, 7:34 PM
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Re: 93 F2 Cleaned Carbs and Now It's Not Starting?

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Originally Posted by IanDoohan View Post
Ok, wanted to make sure it wasn't the air/fuel screw.

The oil isn't going to make a difference in the starting issue. Something isn't right from your carb clean. I'm guessing that just blowing the air in the passages has actually clogged something up. Remove them, disassemble them, clean them properly, then reinstall and test.
Yep, can't know for sure but you may have blocked jets... I have used a strand from a multi-strand copper wire to poke out the jets. Thought I could use the smallest of a tip cleaner for a oxy-acetylene torch, wasn't small enough. It worked... go figure. BTW...Pretty sure it was a strand of wire from a automotive plug for trailer lights... It's what was in my tool box
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Last edited by cbr99xx; 08-07-2017 at 8:05 PM.
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post #7 of 10 Old 08-09-2017, 8:35 AM
 
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Re: 93 F2 Cleaned Carbs and Now It's Not Starting?

Did you make sure your lines are not binding when your tank is down? You stated it starts a bit when sitting. I would examine the line when the tank is down or run an auxiliary fuel line to the carbs just to make sure though. But as everyone stated likely you need to give it a proper carb cleaning. I'm surprised IanDoohan didn't post that picture he has of how a carb should look broken down for cleaning. Before I used to do a half ass job of cleaning a carb until I saw that picture of how far you should break down the carb to get a proper cleaning. He may be traumatized about posting picture because of that whole photobucket fiasco...
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post #8 of 10 Old 08-09-2017, 1:09 PM
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Re: 93 F2 Cleaned Carbs and Now It's Not Starting?

Welcome back Sabotage!!!!!

You mean this pic?
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IMG_6395.JPG‎  
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post #9 of 10 Old 08-09-2017, 1:43 PM
 
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Re: 93 F2 Cleaned Carbs and Now It's Not Starting?

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Welcome back Sabotage!!!!!

You mean this pic?
That's the money shot...
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post #10 of 10 Old 08-11-2017, 8:59 AM Thread Starter
 
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Re: 93 F2 Cleaned Carbs and Now It's Not Starting?

SO I took apart the carbs and gave it a proper clean, but I noticed there wasn't any gas in the bowls so I said "okay, lets throw a little more gas than the one cup of gas that's in my tank right now" and... it idled and was fine. Amazing how it always seems to be something silly.

But now it's running so much smoother with a real clean without a dead spot between 4-5k RPM's. It's a little harder to start up each time, but I'm attributing that to the weather getting a bit colder in my area as I just turn the idle adjuster a bit when starting to get it first or second crank (I do need to get a new choke cable for those truly cold starts after not riding a bit D

Thanks all! I'll definitely do a proper carb cleaning from now on just to make sure I can rule it out
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