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Carb sync for dummies

  • Thread starter Thread starter claygs750e
  • Start date Start date
claygs750e said:
Sorry, I mean give it throttle. The choke is not engaged at that point since it ran good for about 3-5 mins. Now it seems like when I give it some gas it bogs down and dies. It was running stead with the choke not engaged and then the idle got lower and lower and then died. Once it seemed like it was going to die I started increasing the idle knob with no help. I do have a golf tee inside the vacuum line attached to the carb. That's ok right?
Click to expand...

That's good, as long as you have a secondary fuel source hooked up, or are running on PRIME
 
What does pulling on the throttle and bogging it down sound like? I didn't make and changes the the butterflies besides the bench sync and the mix screws areat 2 turns in
 
Just a simple silly question that I don't think has been asked yet. Did you put the air box and/or filters back on? CV carbs won't really idle without them.
 
I've tried with them off and on. If it cools down I have to spray carb spray to get it started so while the pods were off I tried, then with them on. This last time when pulling the throttle and it bogged down the filters were off. Am I an idiot and that was all it was? :eek:
 
"filters"....you mean you have PODS?? so I take it this is not a 'stock' setup on the bike?
 
I have pods, 4-1 pipes with a stage 3 dyno kit so at least based off what I've read that is the correct setup. I realized that with the pods off it would run a little rough, but I wanted to make sure it would run steady for a few minutes and then I would put the pods on and sync. I didn't think it would actually die and then not restart with them off. I will try it again with the pods and cross my fingers that's all it is.
 
Just another silly followup question:

What are you using for a fuel source while doing all of this?
 
I have the tank on a stand next to the bike with a clear line to the carbs. The vacuum line from the petcock is loose since I have it plugged at the carbs
 
Mind you I haven't read the whole thread, but stock petcocks won't work in the run position without vacuum, right?
 
I was told to plug the vacuum line with a golf tee when syncing. I can see gas going into the carbs. Before I start the bike I do suck on the vacuum line to get gas in the bowls first then let it hang loose.
 
Most people use a different temporary tank for syncing the carbs. The first time I did my 650 I did the same as you and set my tank on a stand next to the bike, but without a vacuum line to the "vacuum petcock" it won't open and send fuel to the carbs. http://www.thegsresources.com/_forum/showthread.php?t=174360&highlight=newg
Note my thread, post 105, click on the small photo for short video. The grey metal bottle is my temporary fuel source. The vacuum port is plugged at the hose to the carb.

cg
 
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claygs750e said:
I was told to plug the vacuum line with a golf tee when syncing. I can see gas going into the carbs. Before I start the bike I do suck on the vacuum line to get gas in the bowls first then let it hang loose.
Click to expand...
If you are not running the tank on PRI, then it is entirely possible to run the bowls dry of gas, requiring priming again.
 
Well I'm an idiot again and that makes sense because it would run for awhile and then eventually die.. I could see gas in the line from the tank to the carbs and it seems like it was flowing. Looks like I'll have to make a temporary tank. Any other dumb mistakes people tend to make? would it be easier to just run it on prime? If I do make a temp tank am I just attaching it up high and relying on gravity only?
 
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There are a lot of threads on temporary tanks, and some are ingeniously simple, if you have all of the bits and pieces kicking around. The advantage of using a temporary tank is that you don't run the risk of inadvertantly pulling your tank onto the floor.

You can run on PRI, but just like when parking your bike, you have to make sure you turn the valve to ON to stop the flow when you are not running the engine.
 
claygs750e said:
Well I'm an idiot again and that makes sense because it would run for awhile and then eventually die.. I could see gas in the line from the tank to the carbs and it seems like it was flowing. Looks like I'll have to make a temporary tank. Anyone have a picture of a simple setup and any other dumb mistakes I might make.:| would it be easier to just run it on prime?
Click to expand...


You could run it on prime but I think it would be better and easier, since you have the tank there on a stand, to just hook up a vac line. My temp tank isn't a simple fabrication.

cg
 
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Because I already have the tank off and secure and have the hose I may just run it on prime. Isn't running it on prime and shutting it off when the engine is off the same as the temp tank and clamping the hose when the engine is off?
 
claygs750e said:
Because I already have the tank off and secure and have the hose I may just run it on prime. Isn't running it on prime and shutting it off when the engine is off the same as the temp tank and clamping the hose when the engine is off?
Click to expand...
yes, no different.

Let us know how it goes.
 
claygs750e said:
Because I already have the tank off and secure and have the hose I may just run it on prime. Isn't running it on prime and shutting it off when the engine is off the same as the temp tank and clamping the hose when the engine is off?
Click to expand...

Yes. I just got in from the garage and I wanted to empty a gas tank that had been setting for 7 years. I set it on a stand and turned it on prime. No gas. WTF.:eek: I stared intently at the petcock.:mad: What am I to do! I hooked up a short 1/4 line to the vacuum outlet on the petcock and sucked hard for a bit. The gas started flowing. Must have been stuck.:cool: Might happen to you.

cg
 
I've heard of that happening, Charlie. Might even have happened to me on that borrowed tank I had last summer...
 
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