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Post by 180°off on Feb 2, 2017 22:23:13 GMT -5
So I'm putting my CPI back together again. And I'm getting no fuel to the carb. Checkd the petcock and it works when I put suction to it but it's not getting enough suction from the carb to open it up?? What do I need to do to fix this? Checked compression and it had around 110psi. I know it's a lil low but good enough right? Help please.
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Post by gsx600racer on Feb 2, 2017 22:40:52 GMT -5
Check to see if the manifold is leaking & check vac hose.
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Post by pinkscoot on Feb 3, 2017 11:10:10 GMT -5
It sounds like you're not getting enough vacuum from the engine. Check for leaks, do you have a leak down tester? It could be bad seals. Try plugging the vacuum intake and sucking on the vacuum line while you try starting it. I find a squeeze bottle works great to provide the suction for a petcock. Squeeze the bottle then stick the end in the hose, it will give you vacuum for a little bit. If it starts and runs then you need to find the reason for the bad vacuum.
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Post by ThomasTPFL on Feb 3, 2017 11:31:35 GMT -5
Where is it connected? I don't remember which bike but on one of mine I discovered that it flowed much better if I had the vacuum connected at the carb rather than at the manifold.
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Post by pinkscoot on Feb 3, 2017 11:45:06 GMT -5
If you do have 2 vacuum inputs be sure the one you aren't using is plugged.
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Post by 180°off on Feb 3, 2017 18:23:30 GMT -5
Im not sure what it is. No leak down test but did have 110psi compression. Resealed intake. Hose goes from pump to carb. Still no vacc??
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Post by 190mech on Feb 4, 2017 18:31:32 GMT -5
Where at on carb??Gotta be AFTER the slide..CPI's usually had it in the reed to carb intake boot...
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hmiwb
Scoot Junior
Posts: 19
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Post by hmiwb on Feb 4, 2017 23:22:12 GMT -5
So I'm putting my CPI back together again. And I'm getting no fuel to the carb. Checkd the petcock and it works when I put suction to it but it's not getting enough suction from the carb to open it up?? What do I need to do to fix this? Checked compression and it had around 110psi. I know it's a lil low but good enough right? Help please. Mine did that. I just replaced it with a manual shut off. Might also stop a thief but I'm not counting on that. |
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Post by ThaiGyro on Feb 14, 2017 4:43:26 GMT -5
I have not seen this response yet...but have you taken the petcock apart? Many have an internal screen or often a port that can easily plug, when running. My '85 Honda had so much rust in the tank that the petcock plugged constantly...same issues as you describe.
After a good vinegar/water douche, my fuel tank was clean...soaked all fuel petcock parts and used a toothbrush to clean...cheap and easy. (BTW, I use white vinegar to clean/loosen rust, then air dry with compressed air, then a petrol compatible sealer in the tank...optional.
Sounds like you have multiple issues...clean it all!
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Post by dachurchpcguy on Feb 25, 2017 13:55:01 GMT -5
Way back in the 1970s we didn't have these fancy vacuum petcocks, we had manual petcocks, and we liked them! I have had numerous problems with vacuum petcocks on my hybrid scooters so I'm switching them all to manual. I replaced intakes, made sure the carb was tight, etc. I still couldn't get reliable fuel supply. It could be because of the tank placement, it's not up high like most bikes. The ones I have switched start right up, no waiting for the fuel to prime based on vacuum allowing fuel to get to the carb. I don't know what type of petcock a CPI has, but if it's mounted to the tank there's an easy mod to turn it into a manual system. My hybrids all have tank mounted petcocks, except one tank that shipped with a simple 1/4" tube outlet. All you need to do is drill out the gas side of the petcock until you pierce the membrane. There's a youtube video, link below. (Warning, turn mute the volume, unless you like German metal.) I drill mine a bit further until I can see the drill bit through the tank supply tube. (Big threaded tube that screws into the tank.) Blow it all out with air and reinstall. Then you will need to add a manual fuel shutoff, I use a snow blower 90 degree shutoff. You can get one at most auto parts stores or Tractor Supply, etc. You MUST put a shutoff in the fuel system! There is a slight chance you could end up with a hydro-locked engine if you don't. One bonus feature of this setup is that you will never run into fuel starvation if you run WOT for a long period of time. WOT reduces the vacuum available at the manifold on some bikes. All you need to do then it to remember to turn on the fuel to go, and off to park. You'll get used to it. Petcock modification |
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