• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

the "oh so tricky mid range"

  • Thread starter Thread starter stockGS
  • Start date Start date
S

stockGS

Guest
Alright, I am going to try and trouble shoot my mid range problems and I wanted to start this post to track my progress. Also, to bounce ideas off the group and take suggestions.

My issue is a choppy ride at 55 to 60, running at 4k to 5k rpm. I have looked up this issue on the forum and have read a ton of different solutions and I plan on going through them till I find the right one for my bike. The back ground is this, I have cleaned the carbs fully twice in 1k miles. I had a pinched vent hose and was hoping that was it. No such luck. So on to the next. I know float height and needle height can solve this issue. I was going to try float height first as it makes more sense to me. I read to raise the float height for better suction, is that right? Will that help smooth out the mid range?
 
stockGS said:
I read to raise the float height for better suction, is that right?
Click to expand...

Umm, no.

If it were me, would get every single adjustment on the entire engine perfect before I stated changing things you don't understand.
 
Hi there mate, for any tech info like this we'll need a detailed setup of your bike to give any relevant info. I'll give my last GS850 as an example:

*****

1984 GS850
Stock engine
Valves set to factory
Oil and filters service 2k ago
Running pods and 4-1 exhaust
Running Mikuni #125 mainjets and 2.25 airscrew settings
No air, oil or fuel leaks anywhere.

Then give a description of your problem, eg I have great acceleration from 2000rpm upwards but tend to pop a lot on deceleration.... whats wrong?

Answer: You may need to up your mainjet, as if its fine everywhere else you are running lean up top. Try 130's.

Fix: I put in 130's. It solved the issue.

*****

Note that in the example above all other considerations were taken care of - the bike was well serviced and there were no fuel or air leaks anywhere. You need to rule those out.

After that, you may need to get a more thorough description of the problem. Is it midrange everywhere, any gear? What is throttle response like? Does it have a good, solid idle? What is your acceleration and topend like?

If it has a hanging idle and weak topend then you are most likely lean and need to tweak both mainjet and airscrew settings.

Cheers - boingk
 
Good call boingk. Tkent02, the needle height is one I don't get at this point. Everything else I can wrap my brain around. Though I would hate to buy new jets as an experiment, so I would like to try everything else first.

I have a straight stock set up on a 1982 GS850G.

Stock air box
Stock exhaust
Jets are 115 (biggest, main?) 40 (under the rubber cap) 180 (air jet)
Air/fuel screws are set at 3 turns out.
Oil changed 1400 miles ago
Sprayed starter fluid around all 8 boots and no air leaks, engine is tight.
Idle is a smooth 1k, with a good throttle response.
Start up is fine, acceleration is strong in any gear. Top end is smooth.

I seam to have problems at cruising in any gear. When accelerating I have no issues, but when holding the throttle at 1/4 turn is where it gets choppy. I also smell gas in the exhaust and I have backfire on warm up and compression braking. That's a sign I am running rich right?

Thanks for the direction.
 
Oh, and I have done a complete tear down with a 24 hour dip for each carb. New rubber throught out the carbs. Floats are set to 22.4m.
 
Have you tried plug chops with some new plugs after riding at that speed making it feel choppy for a couple miles, then pull in clutch and hit kill switch immediately? Then just pull right over and pull ALL the plugs to get a good reading on each one. At least that would give you a starting point to know whether you need to lean it out or richen it up where the problem lies.
 
You must log in or register to reply here.
Back
Top