• 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.

GS450 long warm up time?

  • Thread starter Thread starter normcoffey
  • Start date Start date
N

normcoffey

Guest
Hey all, I bought a low mileage, nice but non-running 1981 GS450T a few months back and after replacing the tires, rebuilding the carbs, oil/filter, etc.; now have gotten it running to put it on the road. Problem is when cold, the bike will start on the choke but idles very low and stalls if you give it any throttle. It seams to take 5 minutes before it warms up enough to ride it. Once fully warmed up it runs very well. Decent power although a little hesitation off idle until your up over 2,000 rpm. Is this typical, the long warm up? I've thought about re-cleaning the carbs as maybe they are still gummed up a little. Any insight would be helpful.
- Norman
 
Sounds normal to me.

My 550 was doing exactly what you describe. Recently I replaced the piston rings and got my compression much higher. Now it will idle after only a few minutes of warm up.

I think depending on how well you're tuned, it will take a bit longer to get a steady idle as it warms up, but don't expect it to be rock steady until it is fully warmed up.
 
If I remember correctly (and it's happening less and less frequently nowadays :oops:)
the only bike that was more cold-blooded than the 450 was the 425.

When you "rebuilt the carbs", did you take them completely apart and dip them overnight?
Did you poke a small wire through all the holes in all the jets?
Did you then blow out all the jets and body passages with spray cleaner and compressed air?
Did you replace all the o-rings? Including the manifold o-rings?
Did you do a bench sync before re-installing the carbs?
Did you do a gauge sync after installing the carbs?
Did you tweak the mixture screws for highest rpm?

You didn't say anything about "dip". If you need to buy a can, it's about $20.
Poking a wire is free, just use a strand from a 12- or 14-gauge stranded wire.
Spray cleaner is only a couple bucks. Compressed air in cans is about the same.
Full set of o-rings is unfortunately not available from cycleorings.com, but they do carry the intake o-rings.
Bench sync has been covered many times before, here is one listing in the archives.
If you don't have a set of gauges, you will need help with the vacuum sync.
Pre-set the mixture screws to turns out from lightly seated. Warm the engine, tweak each screw for highest rpm.


.
 
Five minutes is a little long. Mine usually is about 2.

Check your idle speed and, make sure your at about 1100RPM. My fast idle is about 4000RPM. Also, did you put in a new set of plugs? They can make a big difference.
 
Hey, Mount Laurel!

Hey, Mount Laurel!

I have an '82 450 in Moorestown. As I learned, the bike is very sensitive to air. When I got the bike a few months ago, it had the wrong airbox cover, and it would lunge and hesitate, and I couldn't take the choke off. I got the right one, and now it warms up in 2 minutes, and runs smoothly.
 
normcoffey said:
<snip>. It seams to take 5 minutes before it warms up enough to ride it. Once fully warmed up it runs very well. Decent power although a little hesitation off idle until your up over 2,000 rpm. Is this typical, the long warm up? <snip>
Click to expand...

For a few weeks immediately after my carb rebuild, my 81 450 only needed about 2 mins warm up & off I went...
Then, the very day I went riding w/a guy & bragging about my quick warmup was the *last* day of quick warmups for me....
Since then, gotta wait 5 mins before taking off (just get gear on during that time). I bet some little something is somewhere in the carb(s).
I hesitated to put an inline filter & I guess I should have...
 
You must log in or register to reply here.
Back
Top