bike is surging around mid throttle? please read.

[kevinwcarr]

have a1983 suzuki gs 850g. 10750 miles. just got bike, previous owner installed a k&n air filter. runs good taking off but soon as you get about 1/4 to 1/2 throttle bike wants to kinda bog down some. Go past 1/2 bike runs very well. could the K&n filter cause this? also the bike between 50 and 60 mph it acts like it has a miss. could the carbs be dirty? should i get kits and have the carbs rebuilt?

[chef1366]

Do a search for "shim needle"
Your needle circuit is now lean from the K&N. This will fix you up

http://www.thegsresources.com/_forum/showthread.php?t=126350&highlight=shim+needle

[kevinwcarr]

thank you so much

[kevinwcarr]

if i go back to the stock air filter will that fix my problem?

[chef1366]

if i go back to the stock air filter will that fix my problem?

It might but I doubt it. These bikes were lean from the factory. Do the shim. You'll be happy with it.
By the way have you done a
Valve adjustment
Carb cleaning + o-rings?

[kevinwcarr]

no have not done valve adjustment yet, mechanic is going to do it. i have a valve cover gasket leaking and the cyclinder head gasket and the base gasket. { leaking oil} . carbs have not been cleaned either that i know of. forgot to mention the bike is really cold natured. after warmed up the bike really does not have a hesitation when sitting still giving it almost full throttle. when he cleans carbs should i get carb rebuilding kits? what orings are you talking about and are they in the carb rebuilding kits?

[chef1366]

http://www.cycleorings.com/

http://www.thegsresources.com/gs_carbrebuild.htm

[Johnny K]

Confused. Are jet needles the needles that connect to the diaphragms?

[Nessism]

Confused. Are jet needles the needles that connect to the diaphragms?

Yes, the official name is "jet needle".