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GS450L carb jetting question

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    GS450L carb jetting question

    I finally got my baby out of storage- my apartment management company did not allow bikes on the property. One carb drain plug was stripped out before I gave it to Earlfor to store, and the other got stripped out while I was disassembling it. I fixed the stripped threads by removing the plugs (I had to use a punch to get the first out) and filling the hole with putty. If interested, I posted the details here:


    The bike is 21 years old and sat outside for at least half that time. I got the float bowls off but could not get the diaphragm covers off. A po stripped the heads on the screws. I was having the problem where she would idle, but bog and die with more than 1/3 throttle. I noticed that one carb was clean and one was all gunked up. The two were slightly different, leading me to think that one was replaced a while ago. On the gunked one, the slide took a long time to return to the closed position, so I started to spray all of the passages out and cleaned everything I could access with a wire. I removed the jets and saw that the ones in the older carb were plugged or restricted compared to the other. I also saw that the float valve was stuck in the in position. I soaked the jets and valve in lacquer thinner for an hour and easily cleaned them out with a brush and copper wire strand.
    I am waiting to get the carbs back on, as the afternoon thunderstorms halted that. My question is twofold:
    1) Do I need to worry about getting into the top of the carb, or should what I did be adequate? I think the diaphragms are good
    2) I removed the airbox when I removed the carbs and plan to use pods. Does anyone know what the new jetting will have to be? Should I put the airbox back in to see if this fixed the problem and then remove and rejet later? It was a pain to get it out and I would hate to have to do it again twice. I will have to buy a new filter for the airbox and I would like to avoid it. If I leave it off, will the bike run with the stock jetting well enough for me to know if I fixed the problem?

    #2
    Other than the ease of removing the carbs, why do you want pods?
    Even after proper jetting, the power gains will be barely noticeable, and the hassle will probably not be worth it.

    It has been said before, and I will repeat it now...ONE CHANGE AT A TIME. :shock:

    If you really do want to switch to pods, I would still recommend putting the stock airbox back on to make sure your cleaning session worked. If you go straight to pods, you won't know if the carbs are dirty or just need to be re-jetted.


    .
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    mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
    hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
    #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
    #2 son: 1980 GS1000G
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      #3
      Thanks, I didn't think about it until after I removed the airbox. I was going to switch to pods because I can't seem to find anyone that has replacement filters for my model. They are always wrong (I guess I have to go to the stealership). I am putting her back together now, I guess I will put the airbox back in and reevaluate pods. I am not looking for performance gains so much, but I did increase my mpg 20% in my PT Cruiser by replacing the airbox with an AEM dryflow cone filter (easier with FI engines)

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        #4
        I have gs 450 L as well and although autozone, advance and crap boys did not have the filter I called the dealership and they were able to order me a new air filter for 11 bucks and it will be here on monday. I just ordered it like 10 minutes ago. sometime the dealer has the best hook ups. I am suprised at how hard it seems to be able to get parts.

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          #5
          Eureka!

          Holy Crap!!! She runs for the first time in almost 2 years!!
          I got the stock airbox (with old nasty filter) reinstalled with the carbs and got her fired up. Had some issues wit the battery and the starter solenoid seems DOA. She ran on one cylinder at idle with the choke on, and when that cylinder warmed up I revved her up and cylinder 2 suddenly kicked in, so I guess I still had a (pilot?) jet not working right. Once 2 warmed up, closed the choke and she ran pretty good, but seemed lean. I took off the 2 "snorkles" on the back of the airbox long ago, I decided to try them back on, figuring Suzuki jetted that bike for a very specific air restriction. Suddenly she shot to 3k idling and stayed there, so I adjusted the idle and she purred at 1100rpm like I never heard before. I guess the missing jet also cleared out and started working. There may have still been lacquer thinner in there messing with the fuel emulsion. I shut down and let her cool (aka ate dinner) and started her up once the engine was fully cold. The header on the missing cylinder warmed right up at the same rate as the first. Took a few minutes of choke, but then idled perfectly. Donned my helmet and took a spirited ride around the neighborhood. Started from stop with no hesitation, pulled strong all the way to 7K (ran out of road) and the rpms returned to idle smoothly and quickly, indicating no more lean. The plug fix works so far, no leaks yet.
          This bike came to me (as a gift) with a bad carb, missing parts, broken frame, siezed chain, electrical issues, and not running above idle. She sat outside for the last 10 years at least, so this is truly a miracle! I have been fixing her myself, buying some Ebay parts and some new. Thanks to all the help I have gotten here. Now for new plates, tires, and a brake adjustment and I am ready for some good riding.
          I am actually very surprised at just how fast she is. I guess just 300lb weight makes a real difference.
          OK I'll shut up now

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