• 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.

Suddenly running very rich.

  • Thread starter Thread starter JCSkokos
  • Start date Start date
J

JCSkokos

Guest
A couple weeks ago I finally got around to adjusting the air screws as I was running rich on one cylinder. I got 'er running really nice for about 2 weeks and then suddenly backfiring, smell of gas after turning the bike off, and poor mileage[well poor compared to before:close to 40mpg], and high idle once warmed up.
Will this happen from switching from warm weather fuel to cold weather fuel, or is there something I may have adjusted wrong? I have been filling up at the same 2 gas stations since I got the bike, both are Shell I think.

When it backfires is usually when I close the throttle after a quick blip like at a stop sign, and it smells faintly of carb dip and unburned fuel.
 
Hi,

I've noticed a little drop in my fuel mileage lately too, just the last few tankfuls. It seems I'm switching to reserve about 10-15 miles sooner. I've changed nothing on my bike so perhaps it is the "winter formula".

What are you calling "air screws"?

reassembly040410_01-1.jpg


Are you referring to the "idle mixture screw"?


Thank you for your indulgence,

BassCliff
 
yeah, the mixture screws. I actually used the method outlined on your website.
Have you had any problems of backfiring or misfiring?
 
Hi,

No, my bike is running the same, just slightly degraded fuel economy. I was thinking of synching the carbs, using the "highest idle method" adjustment on the idle mixture screws, and cleaning the air filter just to see if that helps. But I think it may be just the crummy gas we get in the winter.

Could water have gotten in your gas? Perhaps from condensation? Is there any rust in your gas tank? Have you tried some Sea Foam or BG44K or similar? Is your air intake system still sealed up tight?

I've also heard of weird things happening, like main jets coming unscrewed and falling down in the float bowl.


Thank you for your indulgence,

BassCliff
 
Last edited:
Another possibility could be that one of the float bowls is leaking or a pet cock problem maybe !! or just a float sticking ?
 
JCSkokos said:
When it backfires is usually when I close the throttle after a quick blip like at a stop sign, and it smells faintly of carb dip and unburned fuel.
Click to expand...
Time to check petcock operation! Your problem sounds similar to mine last summer- turns out that my petcock was leaking fuel down vac hose during running. Didn't leak when off- just when vacuum was applied and #2 plug would foul and unburned gas would backfire especially at low speed.
 
tom203 said:
Time to check petcock operation! Your problem sounds similar to mine last summer- turns out that my petcock was leaking fuel down vac hose during running. Didn't leak when off- just when vacuum was applied and #2 plug would foul and unburned gas would backfire especially at low speed.
Click to expand...

this is entirely possible considering its the original 30 year old petcock w/o even a rebuild.

Good news is though that I went on a nice 50ish mile ride yesterday and burned down past reserve about 15 miles, refilled tank and haven't had a backfiring issue yet. maybe just a bad batch of gas?
 
tom203 said:
Time to check petcock operation! Your problem sounds similar to mine last summer- turns out that my petcock was leaking fuel down vac hose during running. Didn't leak when off- just when vacuum was applied and #2 plug would foul and unburned gas would backfire especially at low speed.
Click to expand...

Bingo! Time for a petcock.
 
Hey! This sounds similiar to my ESD problems! :eek: High idle, sucky gas mileage, fouling plugs. Backfiring not so much though. I'll have to track down a petcock now.
 
You must log in or register to reply here.
Back
Top