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air puffing out of carb

  • Thread starter Thread starter Tenrilid
  • Start date Start date
T

Tenrilid

Guest
Ok folks, I got the newer carb boots on and I have another issue. I've noticed that air is puffing out of the carb when cranking over. What could be causing this? The engine kind of started for a second but I was holding the throttle open and it revved to 3k rpm but when I let off it died out. Could this be caused by bad valve seating? I am at a loss as to what else could be wrong. And yes, carbs have been dipped, o-rings replaced etc etc. Thanks.
 
Did you do a compression check?
Did you set the valve lash?
 
Cams/crank chain out of time?
Really bad valve clearance?
or Bent valves?
 
I had a feeling it had something to do with the valves or cams. I have not tested compression or valve stuffs as I don't have the items to do so. It is still somewhat starting, or more of surging, when I start it with the choke on but as soon as it starts it dies. I guess it's time to take it to a mechanic that can do all the good stuffs with the valves and cams timing/settings :(

It's not that I couldn't get/do all these things myself, it's just that I've been working on the bike for about a year and I just want to RIDE ALREADY!!
 
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Setting your valves and cams takes only a day. Look at me. I'm a noob. I did those two on one day and the bike runs great where as before it was backfiring like crazy (part of the problem was the coil wiring :o). You can do it!
 
I think I will just try a valve and timing adjustment soon. I will ned to guy the little guage thingies and some gaskets. Hopefully I won't have to replace any of the parts inside the head. Thanks for the peptalk though :-)
 
I dig the thread FC but I want to know if the valves would cause this issue that I'm having. If a valve adjustment and timing check will fix it then sweet. I just hope it's not some major issue :(
 
Tenrilid said:
Ok folks, I got the newer carb boots on and I have another issue. I've noticed that air is puffing out of the carb when cranking over. What could be causing this? The engine kind of started for a second but I was holding the throttle open and it revved to 3k rpm but when I let off it died out. Could this be caused by bad valve seating? I am at a loss as to what else could be wrong. And yes, carbs have been dipped, o-rings replaced etc etc. Thanks.
Click to expand...
Wait... I just re read your first post.

Of course the bike would rev up to 3k when you're holding the throttle open. but it dies as soon as you let go... Hmmm.... Are you using any choke? Maybe the idle is set too low? Let the bike warm up. Try that first.
 
well, another attempt today it surged to 5k but I think that's because the extra fuel it was getting since the choke was on full but again it just died out. I kept trying to get it to do it again w/ different amounts of choke and different throttles but I couldn't get it to do it again. I would love to do things when the engine is warmed up but I can't get it to stay on long enough to do so :(
 
Tenrilid said:
well, another attempt today it surged to 5k but I think that's because the extra fuel it was getting since the choke was on full but again it just died out. I kept trying to get it to do it again w/ different amounts of choke and different throttles but I couldn't get it to do it again. I would love to do things when the engine is warmed up but I can't get it to stay on long enough to do so :(
Click to expand...
I'm not a pro on all of this but maybe the idle is set too low? The idle adjustment is between carb number 2 and 3. Turn that screw clockwise a few times and try again. Turn the choke on all the way. DO NOT TOUCH THE THROTTLE!
 
Ok, I'll check the idle screw. I thought I had it all the way in but I may have unscrewed it when I took off the carbs last week. Also, does anyone know an easy or effective way of taking off the valve cover that's was sealed w/ the silicon stuff about 15+ years ago?
 
after you've pulled out the bolts, you can take a rubber mallet and give it a small whack on either side to knock it loose. If needed, use a small screwdriver to pry up on it but BE CAREFUL you don't put any gouges into the metal or you'll be fixing an oil leak for a long time to come. Trust me on this.
 
Tenrilid said:
Ok, I'll check the idle screw. I thought I had it all the way in but I may have unscrewed it when I took off the carbs last week. Also, does anyone know an easy or effective way of taking off the valve cover that's was sealed w/ the silicon stuff about 15+ years ago?
Click to expand...
Aha! The idle adjustment screw is all the way in. That's why it dies immediately after you let go of the throttle.

Turn that huge knob between carbs 2 and 3 a few times clockwise then try again. Or did I misunderstand?
 
Flaming Chainsaws said:
Aha! The idle adjustment screw is all the way in. That's why it dies immediately after you let go of the throttle.

Turn that huge knob between carbs 2 and 3 a few times clockwise then try again. Or did I misunderstand?
Click to expand...

No, you got it. Would it make that much of a difference with it being all the way in? I just figured it would idle high.
 
Tenrilid said:
No, you got it. Would it make that much of a difference with it being all the way in? I just figured it would idle high.
Click to expand...
Hold on. Let's just start over.

Turn the idle adjustment screw counter-clockwise until the screw does not touch the throttle plate on the carbs. Then turn that screw clockwise 2-3 full turns.
 
Ok, so start where it just contacts the throttle plate then go 2-3 turns in?
 
KK. I may not be able to try it out til tomorrow or sunday but I'll post the results once I try it. Thanks again for the help.
 
Tenrilid said:
KK. I may not be able to try it out til tomorrow or sunday but I'll post the results once I try it. Thanks again for the help.
Click to expand...
Alrighty! I know that there are a few GSR members in the Texas area. russr33, chuck hahn, and JWhelan are a few of them. Maybe you guys can check it out :).
 
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