My 50cc scooter is not getting all the power it used to

[hamburger1121]

The scooter was fast but one day when i left it outside it would not start when I went over it it was the cdi so I bought a cdi and put it in and it lost all power then I put a racing cdi and a racing ignition coil with a good spark plug but that was not the problem then I checked the clutch and it was not opening all the way so I bought a performance variator, a new clutch, and a belt but it's still slow. Can someone give me some help?

[classacted]

you're not giving us much info. does it start right up? does it wind right out when you give it throttle?

based on what you've said so far.
if it's my bike I try:
1. separating exhaust at the cylinder to create airflow
2. separating intake between air filter and carb
3. pulling spark plug to see:
a. is it wet or covered with carbon?
b. gap
c. color
d. good spark

[hamburger1121]

It starts right up, it gives throttle, and I can drive it, but it's not getting the right power; it's stopping at a certain speed and will not go up.

[90GTVert]

See if it revs on the stand. Some of these "racing" CDIs are junk. If it will hit 9-10kRPM on the stand, then at least you know the CDI is not restricting it. Be very careful here, because you don't want to rev it and have the wheel spinning and make any contact with the ground or it's going to take off. For added safety you can remove the rear wheel or take the variator off. Whatever you need to do to be safe.

It could be purely coincidence that it's slow after a CDI going bad, but it is definitely suspicious to me.

A compression test isn't a bad idea to get a general idea of engine condition if it continues to be slow and will rev on the stand.

[GrumpyUnk]

When you 'left it outside' did it get rained on? Was there a lot of moisture from dew in the AM?
I don't see how being left outside overnight would affect a CDI. They really don't get lonely and throw a fit just because you did not put them to bed properly and tell a bedtime story.
Were it mine, I would have gotten a regular old normal CDI to replace the one you consider failing.
Changing a lot of things and then testing it not very scientific and you end up with 'this level' of performance and have NO IDEA what worked better and what worked worse. AFAIK, you have no way to determine the cause of either improvements or reductions in performance.
Step back a few steps, put your old stuff on, and get a baseline. You may have gotten water in the fuel, unlikely, but possible, or something similar and have replaced a lot of stuff 'just because'. Undo that, and make your 'improvements' one at a time.
As I understand the 'performance CDI' modules do absolutely nothing except empty your wallet. Ditto orange ceramic spark plugs, coils, and attending wires. Not worth a penny more than regular old black/white products.
Undo, step back, put things back the way they were, and fix only that which is broken. Then consider/re-consider making more changes. Just my thoughts.
tom

[classacted]

your thoughts are very good IMO, GrumpyUnk. either you were gone for a while, or I simply didn't see your replies. I hope you're doing well.

I have many cdi units, most of them are regular cdi's and two are 'performance' and they all seem to work the same. I prefer the regular cdi's because they fit in the rubber holder that is there. my experience with these chinese (my experience hasn't been long) is that, they either work good or not at all. I've never had one fail gradually. I received one that was DOA. that is also my experience with ignition coils as long as all of the places of assembly and connections are intact. for being so ridiculously cheap, I have to give these mass produced chinese parts credit for reliability, so far.
I still recommend carrying a spare coil, cdi, and rectifier, as I always will.