100cc BBK won't start?!?!

[The moped learner]

I have replaced EVERYTHING dont ask cdi box or carb change i have changed everything! Does anyone have a 100cc BBK and what is the valves set at for that and is there anything i can do to help it start and run! I have spent days trying to get it to start and no luck PLEASE HELP!😢😭

[zombie]

Valves are .004" or .04mm

I would re check the cam timing that is where most go wrong. W the piston at TDC install the cam so the two holes line up w/ the head, and the big center hole is at TDC.

Te quick way to verify you are at least close is to insert a straw or other soft object (careful here) into the plug hole w/ the valve cover off. At TDC the valves should be closed, and the timing marks should be correct. Exactly correct. Close is a no start. One tooth off in either direction is a no start.

This is a good PDF guide...
http://www.thejunkmanadv.com/uploads/8/4/0/3/8403513/repair_manual_gy6_engine.pdf

[The moped learner]

We redid the cam timing twice and it looked right on  and readjusted the valves like 10 times we have been working on it for 3 weeks, 2 weeks trying to get it running

[zombie]

Have you done a compression test? Have you done ANYTHING to the carb?

You have to remember you now have twice the cc's, and that requires twice the amount of fuel/air mix.

Try a can of starting fliud, and see if it kicks off. DON'T try to run it or force it to run on starting fluid, Just see if it kicks. That will verify the need for larger jets, and perhaps opening up the air box.
My 100cc kit will not run on the normal air box. I had to drill two one inch holes in the back section of the boxes cover, and re-jet both the pilot, and the main.
I believe my pilot is a 40 or 42, and my main is 100 or 105.

[The moped learner]

I have re-jet the main to like that amount but not the pilot and i have a pod filter. It will almost start but will not run when shot with starting fluid, it likes to try and start on a little bit past idle but never will run. I have a A9 cam should my exhaust valve be set higher ?

[zombie]

The bike won't run without a proper pilot jet. The main jet doesn't do anything until well past the half throttle position. This is even more so with a higher lift/duration cam.

Try getting a Torch tip cleaner at Ace hardware or lowes/where ever. It will be faster than waiting for jets.
Find the cleaner that fits into the pilot snugly, and then use the next size up to open it up.

I've never installed an A9 cam so I don;t know the settings for clearance but I would imagine it has to be the same as OEM. You just have a sh** load of air, and almost no fuel in the mix.

[The moped learner]

Will try that then i didnt think a pilot jet would make it not start!

[The moped learner]

The A9 cam has higher exhaust lift

[The moped learner]

Set both valves at .4 ?

[The moped learner]

Anyone want a 100cc BBK with the head and jug? I gave up it will never start im tried of working on it i spent $500 on parts and its timed its set to what the valves should be and the pilot is bigger will not even start with starting fluid

[The moped learner]

And yes the engine has compression

[zombie]

There is something simple you are missing due to frustration.

The valves are .004 thousands of an inch OR .04 hundredths of a millimeter. Not .4 of anything.

Check your rocker arm rack. The printing on it should be up-side down when installed correctly. If its not starting w/ starting fluid than you are missing either spark or compression. Those are the the requirements. The subtleties could also be improper valve timing or ignition timing. I would take it back out of the frame. Take it down to bare bones, and let it sit for a few 4-5 days.

Go back at it with the PDF I linked, and follow step by step EXACTLY as laid out. My guess is there is something that you THINK you know but are looking at upside down. Look at it like a retard, and follow step by step. Simple mistakes will make huge head aches.

[The moped learner]

My bad i meant .04 mm i thought it looked wrong

[The moped learner]

I will see if the valve rocked arm rack is wrong but i don't think it is

[zombie]

I'm sure it's a simple over site. you just have to go back to the beginning, and review each step.
Are you aligning w/ the timing marks on the flywheel? Did you remove the flywheel at any point?
Did the bike run before you swapped the kit?