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Difficult to Start, and refuses to idle

  • Thread starter Thread starter 7mJoe
  • Start date Start date
Relax man...take your time, follow the instructions and you'll get them cleaned in no time.

Is the bike your sole means of transportation? If not and it takes you a week to rebuild the carbs thats OK. Look at it as a learning experience..have fun and stop worrying.
 
Got into the first carb yesterday to find new internals; yet, I'm baffled as to why I no longer have an airscrew on any of the 4 carbs! Below is a picture of the 4th carb, and as you can see the location the screw is supposed to be at, is blocked off. My question is why anyone would do this, and will it effect the ability of the carb to do its job?

If I'm wrong correct me, but I did not remove an airscrew yesterday Instead I found them in my box of extra parts.

2j16ces.jpg
 
that is a location of a PILOT MIXTURE SCREW, not an air-screw
what you see is a plug on top of it
you need to carefully drill it, insert a tip of a screw and pull it out to get to the actual adjustment screw

pilot air-jet is located at the back side of the carbs (intake)
 
psyguy said:
that is a location of a PILOT MIXTURE SCREW, not an air-screw
what you see is a plug on top of it
you need to carefully drill it, insert a tip of a screw and pull it out to get to the actual adjustment screw

pilot air-jet is located at the back side of the carbs (intake)
Click to expand...


Is this necessary to get at? Is there any negative to leaving it like it is now? Why would it be blocked off?

I recently finished dipping the first carb and cleaning all the components. I did however notice there wasn't a pilot jet plug, would the plug being absent cause problems?

I really appreciate all the help, never done this before.
 
the pilot mixture screw plug is there because of the emissions regulations back in the day, so the people wouldnt upset the factory settings
the screw has an oring seal that you want to replace as it's old and as the dipping solvent is likely to damage it
its a good idea to inspect the screw needle tip and the spring as well
and you also want to be able to do your own adjustment on that screw as that is pretty much the only adjustable screw on those carbs
having the screw out will help clean the coresponding fuel mixture passage (which is indeed a tiny passage)
 
Hi Mr. 7mJoe,

Starting around 1980, the government started to limit emissions on motorcycles such that the carbs were set (pretty lean) at the factory and the ability to adjust them was (somewhat) taken away from the end user. If you look at the carb specs for bikes from other countries you'll see actual adjustment parameters for the mixture screw on the CV carbs. But not for us in the US. We're not supposed to touch them because we will pollute the atmosphere and cause all of our kids to be born with nine heads! :eek:

But, seriously, read up on the carb stuff around the GSR website and you'll find that it's common practice to drill out the plugs to get to the mixture screws so that we can adjust them properly. It's all part of the fun.

Thank you for your indulgence,

BassCliff
 
Ah, well that makes sense. Now what about the plug on the pilot jet? I didn't have one when I got the fuel bowl off. Should I get a new one or can I leave it off?
 
having no plug on a pilot jet is somewhat like having no pilot jet itself... so, yeah, definitely get a new SET for all the carbs, you want them to seal well
 
I finally finished dipping the carbs. I checked all the float heights and set them according to spec. and I put new pilot jet plugs on since I didn't have any prior. I also set my air screws 1 1/2 turns out. I got the carbs back on and put everything back together. But now I can't even get it to start. I believe I have no spark.

The plug tips were wet, and I took them out to see if I had any spark and there was nothing. So my question now is what can I do to remedy this problem? I have a multimeter but I'm not exactly sure what to check with it. I also plan to do the coil relay mod.

Thanks guys.
 
a service manual usually goes a long way

a service manual usually goes a long way

you need to check the voltage at the coils and also the resistance on both sides
you want 12v or so for the voltage
resistance, hm, i dont quite remember the numbers, sorry
 
From your earlier posts you said you had the bike running. Since you don't have spark now you probably disconnected something. Check all your connections, make sure the battery is charged and check your fuses.

Does the bike turn over or is it completely dead?
 
I checked everything, it's all connected. It turns over just doesn't fire up.
 
psyguy said:
you need to check the voltage at the coils and also the resistance on both sides
you want 12v or so for the voltage
resistance, hm, i dont quite remember the numbers, sorry
Click to expand...

Where do I check this? I don't know where to put the prongs on the multimeter. Is there a diagram?
 
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