I've just rebuilt my Puch E50 engine with a TCCD kit. It fires up okay, but I am bad at the tuning part. Please have mercy on my soul. Any help is appreciated. Here is the setup:
Treatland super stuffy crank, 4x nachi bearings, viton seals
50cc TCCD kit (no case matching)
Treat's o-ring head for TCCD (less compression/sport touring version)
Treatmetric jammer clutch V6.4 (using the medium springs)
bing clone 15mm carb (using the included 2.17 atomizer)
Treat's standard bing hi-flow foam filter
Exhaust: Treatland's own "Treat pipe version 1"
Timing: Currently set at 15 degrees BTDC. Measured with a multimeter.
Points Gap: 4mm, very slight drag. Set with feeler gauges.
Jetting: 2.17 atomizer, single band needle at 2nd notch from the top. 74 Jet.
Clutch: The clutch came with the light springs on it, I upped them to medium.
Gearing: 12/45. Yeah, yeah, I know. I care not for speed. I want as much torque as I can get. (I'm in Appalachia.) I tried 15/45 and didn't notice much difference, which tracks since I'm getting very little power out of it. See below.
Spark Plug: NGK B7HS
How it's running: I started with a 72 jet, and it had trouble starting. Upped it to a 74, and she fires up reasonably well. Idle RPM seems a teensy bit low, but certainly okay. I would up to a 76, but it four strokes when I release the throttle after revving it, and I've always been told that's an indicator that the mix is right. Needle is at the 2nd notch from the top, and it doesn't seem to like other positions very much for idling speed. I have checked for air leaks, and only found one (at the intake/carb connection.) It has been sealed up nice and tight now.
Currently, I have very little power coming out, and it has trouble getting into high RPM or even medium band. On flat ground, it does run, and seems to do okay once it gets into a high enough RPM range. However, the second it has any extra work to do, it bogs down. Even the slightest incline makes it want to bog to the point of stalling. The engine seems to run pretty cold too, don't think I've been able to get it over 265 degrees even at WOT. Increasing the clutch to medium springs helped a tiny bit, and changing my 15t sprocket to 12t helped a tiny bit too. But the main problem is clearly with my engine setup.
My best guess is that my timing is shit, or I'm misinformed about jetting. I understand timing in principle, but don't have the experience to tell what symptoms I would be looking for. What the symptoms would be, etc. What I've found on multiple sites seems a bit contradictory and not very clear. Any advice would be appreciated. (edited)