• 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.

Help! Hard to rev past 6000rpm / No power

  • Thread starter Thread starter Primo
  • Start date Start date
P

Primo

Guest
I tried the search but got nothing.

Ok I got the solenoid figured out, I didn't realize there was a clutch switch and even in neutral I had to hold the clutch in. She starts right up at the push of a button and will stay running. When I'm riding it it doesn't want to pull past 5-6k rpm it just kinda goes up to that and stop. If I change into second it just kinda looses power at 20 mph. Any suggestions?

1981 GS250T 1008 original miles. So far it has a new battery, a new chain, I cleaned carbs, a new clutch cable, I adjusted clutch and I changed the oil.

Thanks,
Primo

Also anyone one know what the spark plugs are supposed to be gapped at?
 
Plugs are usually gapped around .028"

Lack of power at higher engine speeds sounds like it's not getting enough fuel. This raises a question ... just how did you 'clean the carbs'? If you opened up the float bowl and just wiped out the crud, you need to go back and clean them. The best suggestion I can give is to order new o-rings for the carbs from www.cycleorings.com, then get a can of Berryman's carb dip and clean them properly. There is a section in the Garage on How to Clean CV Carbs that works very well. The only thing I would suggest different is the time that the carbs spend in the dip. The directions say "15-30 minutes", I say "15-30 hours." That's right, leave each one in overnight. Keep all the parts for each carb together, don't mix them up.

While the carbs are in the dip, and you have nothing else to do, check the valve adjustment. Clearance is so tight on these bikes, you don't want to burn up the valves because you thought an adjustment was too hard.

Install all the new o-rings, do a bench sync, install the carbs. When the bike is warm, do a dynamic sync on the carbs. Now you should be good to go.


.
 
I followed the How to clean carbs tutorial to clean my carbs and left the bodies in cleaner overnight. The only thing I wans't able to clean were the imulsion tubes. I tried the wooden dowl and hammer technique but just couldnt get them out. Could they be the source of my troubles?

Primo
 
Primo said:
I followed the How to clean carbs tutorial to clean my carbs and left the bodies in cleaner overnight. The only thing I wans't able to clean were the imulsion tubes. I tried the wooden dowl and hammer technique but just couldnt get them out. Could they be the source of my troubles?

Primo
Click to expand...

My guess is that if the holes on the sides of the emulsion tubes are plugged it would effect high rpm running. Another thing that could cause the problem is a bad ignitor. You might want to try cleaning all the electrical connectors to make sure everything has proper contact.

Good luck.
 
I would check the mechanical advance behind the signal generator. Take it off and make sure it turns freely. Take it all apart and clean the whole thing and lube any of the rotating joints. Keep an eye on all the clips and washers when you are taking it apart.
 
Kaptain Ketchup said:
I would check the mechanical advance behind the signal generator. Take it off and make sure it turns freely. Take it all apart and clean the whole thing and lube any of the rotating joints. Keep an eye on all the clips and washers when you are taking it apart.
Click to expand...


Does anyone have a picture of the mechanical advance? I have no idea what that is.

Primo
 
Stolen from ebay:

c412_1_b.jpg


IMG_8855.jpg


It's behind the pickup plate. Mark the position or have a timing light on hand to reinstall it.
 
Could a wrong float level make the bike do this? Where is the float supposed to be set on this bike? I'm going to pull it back apart and see if I can get the emulsion tubes out and wanna do it right when I put it back together.

Primo
 
The intake boots between the carbs, and airbox are not sealing properly.
 
I replaced the o-rings in the intake boot with a couple of viton ones, it seems to have gotten alittle better but still not great. I got her up to 40 but that was going downhill. I did notice that the boots from the air box are pretty loose, I'll get some new clamps and try cinching that down tommorrow. On a side note what should the valve clearances be?

Primo
 
Last edited:
You must log in or register to reply here.
Back
Top