Good call on the new carb. This sounds like it should get you going. That compression still seems low, but should still run. Try some starting fluid directly in the cylinder (remove spark plug) and then try to start again.

 

With all do respect, WD-40 is used in place of starting fluid on 2 strokes. Yes ppl use starting fluid but it should only be used if nothing else is available.
I think the compression should raise once the rings seat. It's good now tho.

 

No problem. To each is own. I've done this on all my 2 and 4 strokes without any ill affect. It should only be a small blast in the chamber to get it running. I do this on my 1979 Honda Odyssey as the fuel pump system is terrible and it takes a little kick start to get the pressure up to feed fuel from the tank. Agreed on the compression should raise upon ring seat. I just did the piston/rings on my Honda ATC and it was registering 170 before I even put a spark plug in to start it up.

 

BTW, I thought I would mention that I am using a 4 stroke coil from my 150cc yamoto for testing right now. The spark is good. The CDI box is a 2 stroke one that appears to still work. From other posts I believe there is very little difference between the 4 stroke and 2 stroke coils for chinese quads, only the CDI itself.

 

Should be ok for now, but why not order a proper one while you wait for your carb to arrive. They are cheap.

 

I fired some down the spark plug hole, tried to fire it up and nothing.

I'm getting concerned that something else is wrong.

1. I have spark. This means the CDI and coil are working properly. The spark is visible all the way to the end of the plug. I had a plug matched at autozone from the BP7HS spark plug, gapped to .025 - .028.

2. This quad does not have the ignition switch, it appears to have been bypassed by the previous owner ~ this seems quite stupid to me. I can see where they used a butt connector to bypass it. The starter turns over. If the kill switch is active I can't get the starter to turn over.

3. Exhaust? Could the exhaust be plugged or something. I don't see anything removable from the exhaust pipe to be cleaned, etc. I can feel compression/air come out of the pipe when turning it over.

4. I put my hand over the intake of the carb to choke it, and had the gas engaged the whole time. Nada. Did not even sputter or anything else.

I'm getting concerned I have some other strange problem. I guess it's time to pop the cover and inspect the reeds. I'm still waiting on the carb. I'm going to order a 2 stroke coil and give it another shot this weekend.

 

This hopefully does it. Still have not inspected the reeds.. Been at work all week =(

 

I installed the new carb, no juice. Shot some wd 40 down the intake of the carb and nothing.

I took out the intake and inspected the reeds. They looked brand new. I'm thinking at this point the cdi and or ignitions system has a problem. I am getting spark at the plug when I take it out.

I'm concerned that spark is not enough. The guy who previously owned it thought it might need a CDI. This is a 2 stroke CDI. I used a 4 stroke coil from my yamoto. This was recommended to be okay on another thread, the generic china coils (4 stroke or not) work just fine, only the CDI timing on a 2 stroke is different. Even someone who used a 4 stroke cdi was able to get the engine to run. At this point I have no idea why it won't run. The plug is new and fires, compression is above 90, new carb, new head, new piston, fresh gas mixed with some 2 stroke oil.

Now I know why this quad was sold for a few hundred bucks, someone could not figure it out and i've spent another $125 trying to fix it.

Any suggestions would be welcome. Throwing wd40 down the spark plug hole and firing does not seem to work. I can hear a weak ping or detonation when I hit the gas when trying to start it.

Is it possible the timing is off somewhere? Should i buy another plug?

Will a 2 stroke CDI even when bad still allow the coil some spark?

 

I've seen new plugs not fire under compression. Might as well try another.
Is the plug wet after trying to start?
I wonder if someone has messed with the timing (turning the stator).
You mentioned the pipe puffing. You might want to pull it and see how much air goes thru it with compresed air. Shouldn't take much to see.

 

The plug does look a bit wet, but is brand new. It will spark immediately when taken out of the motor and set next to the engine block. This engine supposedly requires some special tools to pull the stator assembly, a reverse thread 27mm tool.

Should I try to take out the exhaust and see if it fires?

Not sure what else to try at this point. The spark color is blue on the plug when it sits next to the motor after cranking it over.

BTW, I do have a 12v battery hooked up to the quad when trying to start it. I think i'm about ready to go through the wiring diagram.

From other forums, having spark does not necessarily mean the cdi works properly from my research.