I can crank the kick start by hand?

[retardninja]

Hello all. I have been trying to get my scooter started for a couple of weeks. It used to run fine, but now it won't start at all. I changed the spark plug and emptied the old gas, sprayed quick-start in it and still no go. I watched a youtube video and the guy said to test the kick start by hand and it should have some resistance. Even for as weak as I am, it was no challenge to turn it and the "putt-putt" sounded very weak as well. What are the likely causes of this? Is there anything I can do? I just bought a compression tester but apparently there is no compression, so I guess I'll take it back. Is my engine junk? I have to say this is pretty disheartening. Any help would be appreciated.

Thanks.

[jmkjr72]

vTwo or four stroke
Where did you get tbe tester from and what did it cost most of the ones that cost 30or less are not ery goodv

[Rebel]

First was the plug in it when you cranked it over by hand. No plug would make it very easy to turn by hand. If the plug is out put your finger over the hole and then crank it, if it has good compression you will feel a good pressure build up pushing against your finger. On a four stroke scooter you should be getting about 120 pounds of pressure or more. If the pressure is under 110 you probably have worn rings or valve seats.

[retardninja]

The plug was in it. I have done a valve adjustment to .004 on intake and exhaust. It seems to have a little better compression now. I put some gas down the vacuum line into the intake manifold but it still wouldn't start. I think maybe I used too much? I even sparayed tarter fluid into the air filter and still nothing. I did have some oil in the air filter box but I didn't think that would be that big of a deal at this point. Should I wash it out? Oh yeah it is a 4-stroke gy-6. Thanks for getting back to me.

[Rebel]

Still you need enough compression, not just better, if you have to replace the top end(head, cylinder, piston and rings) it is not that hard to do or expensive.

Did you check for spark?

[retardninja]

Yeah it has good spark. I'm sure I can replace the top end, but how can I be sure it isn't just a air to fuel mixture problem? I have a compression tester that I bought from Harbor freight, but the last one I bought didn't give me a true reading, so I'm skeptical about even opening it because then I will have to pay a restock fee, but this IS what I bought it for... I was going to make a video in a few to show how I have my lines connected. Is there anything else I should include in it? Thanks for your help. I do appreciate it.

[jmkjr72]

fWhat restocking fee take it back tell them its a pos and doesnt work and you dont want another of tbere testers

If youhave tried starting fluid and it stil doesnt fire thats a pretty good sign its not fuel related

[Rebel]

Well if it has good spark, it needs fuel, compression and proper timing for it to run.

If you know you have fuel getting to the carb, look for vacuum leaks. These leaks can make it hard to start the motor, they would be a open nipple on the intake manifold, a cracked manifold, a loose hose someplace. There should be a hose going from the intake manifold to one side of the fuel petcock and another hose going to a filter and then on to the carb. Make sure you have fuel flowing. I'd use some starter fluid to try and get it going if you have a good spark. If it does not go with starter fluid or at least try to go, you need to check that compression. If it is a GY6 it should have an electric starter and that makes it easier.

Before you open that HF gauge. Take the bucket out under the seat so you can get to the motor easier. Pull that plug out and stick a finger across the spark plug hole, try to keep it from pushing the air out, if it pushes back you may be OK. If it seems weak to you either assume it needs a top end done or go ahead and test it.

[retardninja]

I feel a really good "pulse" but if I push hard it wont lift it. I put a tablespoon of oil in the spark plug hole and now the compression feels pretty strong actually, (it would lift my finger after the oil sealed off the valve)so I know I have a problem, but I don't know the name of it. I sprayed some starter fluid right into the spark plug hole and it still did nothing.

I guess you don't think it has a bad vacuum seal then? I'll make a video of all my vacuum lines because I may have them hooked up wrong...(I doubt it though).If I use engine restorer will it be a problem later when I replace the top end? Thank you for the help.

[Rebel]

When you put the oil in, it fills the worn area the piston rings have. So you probably might as well order a top end kit. A head, cylinder, piston, rings, head gasket, base gasket, exhaust gasket. If you go with a big bore kit tou will need to tune the carb, it will be runnng lean and require a larger jet.

[retardninja]

I really doubt I have these wrong but I thougt I would put this up just in case. I am ordering my top-end rebuild parts tomorrow, but they didn't have any BBK's. Taotao USA quoted me $124 for everything that was on the list you provided me Rebel. Please let me know if you know where I can get the kit or if there is anything wrong with how I have my vacuum lines connected. Thanks.

[Rebel]

Tvnacman, John, sells parts he has a ad in his sig line here. You might ask him. Enviromoto sells a kit I don't think it has the head with it and you might need one of those, parts for scooters is a good source and Scrappydog scooter has them as well. One problem withthe chinese parts is quality control and you always run the risk of gettinga bad part, it happens but not to everybody. The quoat you got for the parts seems good.

I will look at the video when I get home tonight and comment on that later.

[arcanum70]

May 26, 2013 17:34:28 GMT -5 retardninja said:

I even sparayed tarter fluid into the air filter

That's your problem, tarter fluid only goes on fish sticks.

WAKAWAKAWAKA...thank, you, I'll be here all week...try the veil.

[Rebel]

I think you do have the vacuum stuff hooked up OK. I found a diagram online for you to refer to

[craisin]

saw your video
the big vacumn thing looks like a charcoal canister for storing petrol fumes while the scooters not running.
I zip tie my fuel ine to make it go downhill from the bottom of the petrol tank to the carb and i had to shorten the fuel line to achieve this