Bogs after half throttle

[intel2you]

Just picked up 78 GS 550. Didn't run when I got it. things i did so far was toredown carbs and completely cleaned them clean the points removed the air filter to make sure that was not the problem. Seem to have good spark at all cyl. Sand blasted the plugs. Checked that pipes on all cyl are warming up (yes they are) also did comprestion test.fresh gas with seafoam.

Now what it dose is. Seems to idle good in 1st gear is seems like it wants to go like hell go to 2nd and open it up and it falls flat on its face seem that at over half Throttle it bogse and if you stay on it dies out won't go over 45 to 50 miles a hr. I'm stumped as what to do at hhis point. Thanks in advance to all

[blowerbike]

you have to have the airbox and filter installed and all the boots sealing 100%
sounds leans from to much air.

[BassCliff]

Greetings and Salutations!!

Hi Mr. intel2you,

With stock jetting in the carbs, these bikes need a tightly sealed air intake system that includes new intake boot O-rings, usually new intake boots themselves (the old ones are hard, cracked, leaking), a tightly sealed airbox with a clean, lightly oiled air filter. If you run the bike without the airbox or air filter installed it will be getting too much air and will bog when you twist the throttle. Carefully read and follow all the information in the links below.

Let me dump a TON of information on you and share some GS lovin'.

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Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

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Thank you for your indulgence,

BassCliff

[intel2you]

Dose the VM carbs have them orings the boot have no cracks and are nice and soft yet I will put air box and filter back in and try it. So are you saying I can put a small a little air filter on each carb and it run right?

[BassCliff]

Hi,

Any changes to the intake or exhaust will require jetting changes to the carbs. If you install pod filters you will have to change the jetting in the carbs to compensate for the increased air flow. Please read carefully all the information in the links in my previous post.

Thank you for your indulgence,

BassCliff

[hampshirehog]

Dose the VM carbs have them orings the boot have no cracks and are nice and soft yet I will put air box and filter back in and try it. So are you saying I can put a small a little air filter on each carb and it run right?

The boots do have those O rings and they are a regular source of air leaks. Your bike doesn't stand a cat in the proverbials of running right if it hasn't got the airbox and filter on there - it'll be pants.

You can run pod filters but you need to know what you are doing with carb tuning. I guess as you are asking some basic stuff here it might be a bit out of your comfort zone though.

[intel2you]

It was the airbox thanks guys