[Johnny 5]

I tried a 92 link chain and it was too long and the 90 link stock chain was not allowing the cam to sit in the head flush. So I saw a youtube video on sandpaper milling on a flat surface. It worked so I could get some slack back in the chain and my piston to valve clearance is good.
Compared to my 155cc red buggy with the same cam, port job, exhaust system it runs at full throttle a lot smoother and pulls all the way to the max rpm until it hits 8500/8800 rpms. The blue 183cc buggy at 3/4 throttle or more for a extended run down the main dirt road were we go ridding feels like it is laboring to maintain, but on short burst on the tight trails it runs great from 1/4 to full throttle and back to 1/4 and full throttle.

It reminds me of the tunnel ram with two 750 vacuum carbs I ran on my 355 in my 68 chevelle back in the early 90s. I wanted two 390cfm carbs but my friend talked me into the bigger carbs. I could get it to idle and at full throttle it would run like crazy but at part throttle it would surge due to the weak vacuum singnal. After a month of trying to get it to work I put a single 750 on a wiend team g manifold. It did look very cool with the carbs sticking out of the hood.

Back to the subject, as for jetting I am running a 127 main 34 pilot and at a full throttle run at 50 yards ignition off the plug is dark brown and clean on the other side of the plug. The jetting feels good and as of right now I am thinking the orange coil may be the problem. I have read that the stock coils are in some cases better, maybe it cant keep up with the spark or the cdi may be bad? I am running a stock cdi in the 183cc because the orange advanced cdi dosnt work as good.

It runs good just could run better due to all the money spent.