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Post by frankj on May 8, 2018 9:52:21 GMT -5
My 17 year old son recently purchased a 50cc scooter, 2004 Venice QS 5-QT-5, and I am having some starting issues. I have replaced and tested the spark plug and I have spark. I have checked the pet cocked, that is mounted to the frame, and I am able to easily blow fuel through it. The carburetor looks to be brand new and the guy who sold it to me said he replaced it. The engine turns over, but it is obvious that the battery is getting weak. My son said he was coasting down hill, a small incline, and it just died on him.
Any help will he greatly appreciated. My son spend $400 and I really want to get this thing running for him. Thank you.
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Post by tortoise2 on May 8, 2018 10:56:14 GMT -5
2-stroke engine . . so if you have verified spark and fuel flow, then test cylinder compression, loosen exhaust pipe bolts at head to verify muffler is not internally obstructed, and inspect reeds.
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Post by frankj on May 8, 2018 11:09:11 GMT -5
Thank you. Before I try these tests do you think I should replace the battery? Like I said it is very weak. I have another question, would the weak battery affect the operation of the automatic choke that is mounted on the carburetor?
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Post by geoffh on May 8, 2018 15:05:53 GMT -5
Tortoise is a bit of stickler in getting you to help yourself,Have the battery tested before you swap it out.The auto choke isn,t likley your problem,most scoots have a vacum fed fuel system which is problamatic,post some pictures of the scoot the carb and your pet cock so we know what you,ve got.If it,s got a kick start use that untill it.s running again,Have a good look around making sure every thing is secure and in one piece.Take the plug out and let it stand overnight then replace and try to start it,is the plug wet or dry? ,lets go from there.
geoff
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Post by frankj on May 8, 2018 15:23:29 GMT -5
Thank you Geoffh. I will post pics asap. I will also check the spark plug and see if it's wet or dry.
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Post by frankj on May 8, 2018 16:05:51 GMT -5
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Post by frankj on May 8, 2018 20:42:24 GMT -5
The spark plug once removed is dryish. I took it out and there is a tiny drop of fuel on it. Where should I go from here?
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Post by AtariGuy on May 9, 2018 2:03:12 GMT -5
Most will replace a vacuum petcock with a manual fuel shutoff valve. I very highly recommend finding a brass shutoff as those plastic jobbers you find at most big auto shops (in the generic lawnmower section) wont last more than a season. Secondly, it's always recommended to become familiar with removing and detail cleaning a carb. 80% chance a previous owner didn't do much cleaning to it. Gunk and crud in a carb will make a scoot run erratic or horribly if at all. 90GTVert has a good 4 part series on everything you should know about cleaning, fixing, and adjusting your carb. 100% spot on for your specific carb. As for the weak start, my venice (when i bought it) had a ground line that -should have- been secured through the top starter mounting bolt. It would start horribly slow if at all. Make sure that wire is making a solid connection both at the starter and the battery. If it's 2 wires coming from one terminal at the battery, the second wire mounts to a bolt that secures the coil to the frame found underneath the floorboard right side. Get your battery checked too. And finally, be sure to monitor your oil reservoir, make sure it's not dry and that it is using oil. You should be periodically refilling it - dont let it get below half full, bad things happen. Engine damage will happen -really- quickly if it runs out. Plus bleeding the oil line is a bit of a chore. Be sure to check on the oil pump and lines from time to time too, make sure the oil you are using isn't actually leaking elsewhere instead of being used in your engine. Optionally, you can disable the oil pump if you would prefer to premix your oil/fuel. Plenty of details in the 2 stroke tech section (also supplied by 90GTV.) Or some just add a couple ounces to the gas every time they fill up. It will run slightly oil rich/fuel lean (rejet carb for this) but its like a safety net if you do run out of oil or the injector system fails. |
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Post by frankj on May 9, 2018 11:10:09 GMT -5
Atari Guy, Do you have a picture of the manual fuel shut off valve by chance. I have 3 hose that run thru the pet cock I have. One is the fuel line from the tank to the pet cock, one is the fuel vacuum tube and the 3rd is the fuel line to the carb.
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Post by frankj on May 9, 2018 13:01:45 GMT -5
I have another question for anyone who is willing to help. Is it possible to have air in the fuel system? If so, is there a way to bleed the air from the fuel system. Thank you.
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Post by geoffh on May 9, 2018 15:05:39 GMT -5
frank,most are gravity fed systems and won,t hold air locks,you need to establish that the carb has fuel to it,suck on the vacum and fuel should run out the fuel feed.Try it with the fuel cap off,check for a "hidden filter" at base of the fuel tank(inside the tank)my yamaha has one combined with the petcock.Your pictures are great but your fuel system seems over complicated.Plenty of help on this forum just takes a little time  geoff |
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Post by frankj on May 9, 2018 15:14:09 GMT -5
Geoff,
Thank you once again Sir. I will look for the filter inside the tank and also make sure the pet cock is doing what it is suppose to. I have been trying to start it with the kick start and then I will remove the fuel line from carb to see if it is wet or has moister and nothing.
OH, I also did as you said, I took the plug out and it only had a tiny drop, residue, of fuel on it. I have had the plug out over night and when I replace it, it will be a full 24 hours. Why did you suggest leaving the plug out? Just curious.
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Post by geoffh on May 9, 2018 15:26:14 GMT -5
If your fuel system was working and you crank it over and over that unburnt fuel will be inside and needs to evaporate out,but I think your problem is lack of fuel.
geoff
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Post by frankj on May 9, 2018 15:41:56 GMT -5
I agree. I don't think I'm not getting fuel thru the carb or to it. do you know if there is a troubleshooting guide for this? Any specific steps to follow or in what order to check things?
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Post by frankj on May 9, 2018 21:35:51 GMT -5
So..........I finally got a little fuel, via the fuel line, to the carb, but none at the plug. The plug is dry. So is it safe to assume the issue is in the carb? If so, what is my next step?
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