Carb Help

[Anonymous]

I need help! Let me give you the history before the problem. I got this 82 GS 450 from a friend. It had sat for 3 years. I changed the oil and plugs and put in a new battery and gas and it fired right up. Ran like crap and discovered it was only running on 1 cylinder. Electrical checked out fine so I yanked the carbs to find one bone dry. I half-assed cleaned it out and reinstalled and put on a Mac exhuast with new gaskets since the stockers were holed and removed the airbox. It ran on both cyliders but had a dead spot in the acceleration at about 4000 RPMs. I chocked that up to not having any filters on it. I beat it around the block for a couple of days and then it wouldn't start. I figured the carbs were just dirty since it sat so long and I only half-assed cleaned the 1. Since I had the new exhaust and bought a set of pod filters I figured I would put in a jet kit when I tore the carbs down for a good cleaning. That's the history.

Here's the problem. I installed the DynoJet kit and cleaned the carbs within a inch of their lives. Put the carbs back on with a fuel fliter (Screen Type), never had one on it before, with emgo pod filters and removed the vent tubes. It won't start. Actually it will, every once in a while for a couple of seconds then stalls. If the choke is on all the way and the idle setting is set as low as I can get it it will idle but will stall if I change either of the 2. It backfires alot when trying to start as well. I have tried numerous mixture screw settings from a stock 1 1/4 turns out to the recommended 5 1/2 for the DynoJet Kit. I got frustrated and removed the jet kit and put it back to stock. Still won't start. Someone give me a clue where to look. The bowls are filling so its not starving unless something is wrong in the idle circut which I don't know where to begin looking. Anyone been down this road?

Please help,

John
Cincinnati, OH

[AOD]

sometimes if the bike sits too long the spark plugs might foul out. and when you get excited about one thing you may overlook other ones.

pull off a spark plug boot, put on a new plug and ground it to the frame and check for spark on each wire. if you have spark, pull the plug out of the engine, ground it, check for spark.

i think this might be the reason...just going on my experiences.

~Adam

[Anonymous]

toolman

I am still green with working on bikes but here's what I would do.

I would first check to see if you have spark. Try using spark tester on the engine block (couple $)
I would check out the spark plugs right after you try to fire it up - to see if there is any fuel in cilinders or if it is flooding.
Then I would double check the setting of the idle screw, and afetr that I would call someone who knows what they are doing to help me

I hope I maybe gave you some ideas.

[SqDancerLynn1]

also check the petcock, make sure that you are getting fuel

[Anonymous]

Plugs are fine and spark is fine those were the first thing I checked, also petcock is fine and I put on clear fuel line to monitor the flow of gas. The problem is in the carbs somewhere?

[Anonymous]

Idle circuit

Try a SMALL shot of gas straight through the carbs into the intake. The popping is lean or out of time. Seeings as it ran before, my guess would be that you missed some junk in the carbs. Go through the carb cleaning in The Garage section and see where each circuit gets it's fuel from. Did you get the pilot jet out or just spray cleaner everywhere? Did you set the floats about the right height? It's in the carbs I would guess. Bob