revs where are they

[550cooltimber]

Hi you all and thk's for reading the post. 1980 gs 550,12000 miles ---here's the deal replaced,0 rings,boots,carbs are clean,clean i say,new plug's,stock air cleaner,130 main jet,3.5 turn's out fuel screw,idles great,starts nice,rev good to 5000 rpm,but falls on it's butt. any clue's???

[BigD_83]

You have the CV carbs, right?

3.5 out could be a tad rich. What do the plugs tell you?

EDIT- at what throttle does it fall flat? 1/4, 1/2...?

[tkent02]

Isn't a 130 main jet way too big?

I don't know the CV on the 550, but it seems too big.

[BigD_83]

Assuming you are dealing with stock carbs and jets, the 550 should be BS32SS, with a main jet of 92.5.

Our 650s have BS32SS and the main jet is either 97.5 or 110.

Yeah, 130 IS too big unless there is one heck of a header on there. Any evidence there were pods and a 4 into 1 system at one time?

I'd place a small wager that you don't need choke to start your bike, and you are running really rich

[BassCliff]

Greetings and Salutations!!

Hi Mr. 550cooltimber,

Is your bike stock (modified intake or exhaust)? There is a carb specification chart on my website that will tell you the stock jet sizes and such.

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

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Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Cleanup Series, and the Stator Papers. All of these tasks must be addressed in order to have a safe, reliable machine. This is what NOT to do: Top 10 Newbie Mistakes. Now let me roll out the welcome mat for you...



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

[550cooltimber]

I drilled out the mains with a # 55 drill bit,through the 92.5's.stock carbs'.need the choke sometimes,plugs' read a liitle dark as one would expect. 1/2 throttle and then shut it off,will not rev past 5000 as it falls of.was running 92.5 but had no power-took forever to get up to speed,could not go 60mph. thks

[550cooltimber]

oh! the 550 has 4into one exhaust,stock i think