My engine is a 200W kit from Rock Solid from South Australia.
50cc 200 Watt Engine Kit
Before shipping any of their products, they do at lot of the construction (eg. my carb was already fitted to the engine with the clamp and everything a lot of people recommend using to prevent leaks), they do the run-in so the customer doesn't have to, and they run it on the dyno for around 2 hours at full speed to make sure parts and soldering and everything is good to go.
The head person mentioned that the real test is once it's on the road though of course to know if everything is aye okay.
I live in the suburbs and the closest mechanical place selling parts is approximately 8km away, about 6 miles I'm guessing; and yes I'm a wimp. When my bike broke down, I had to push pedal a good 15km give or take (12 miles?) and I struggled. I used to do around 20km (17 miles?) without too much struggle, both to and back so 40km total.
My rear is hurting like heck and I can barely sit on it now... Thought I had ordered the gel seat when I ordered the bike... Must have forgotten...
I was messing with the screw a bit to find a good idle mix and it may have been 3/4 in at that time, but I rarely idled because I was on a long large highway which was where I was going at full speed, probably more than the rated 20km/h rated by the manufacturer, and it popped and stopped.
I was using Valvoline 2 stroke oil at about 35:1 ratio, give or take a bit more, can't tell exactly as it's hard to measure on a bottle where the fuel is as dark as the bottle itself so even the measuring guides on the side was tough to see during the first 100ml worth.
It's a synthetic enhanced oil since the petrol station I was at didn't have Penrite... No station seems to have Penrite... So I'll need to buy some at Autobarn or something. The manufacturer recommended Penrite at 35:1, it'd save me the hassle of figuring out a good ratio of other oils and if they're the right one or not. 10:1 if I use Opti Oil.
With the Valvoline though, I didn't get much power. It'd chug along the ride, maybe at about 10km/h.
I ran out of fuel during my test ride and needed more oil to mix, so I bought Castrol 2T Self Mix, which now that I look closer, doesn't mention synthetic anywhere. The ratio I used with this was probably about the same.
My bike struggled to get started at first, it'd start, and when I turn off the choke, it'd stop. If I leave the choke half way, it'd work. Eventually after a bit, I could turn the choke off and this was when I was flying down the highway. I heard some popping noises here and there and just thought it was the oil between the fuel, just getting the mix going, and possibly the air and after a while, one last pop and it stopped. The pops weren't anything loud or bangs, just small pops, but still easy to hear.
In all honesty, it'd be my own fault really that it would burn out, but it's all a learning experience that's worth it in the end.
The fuel I use is Premium (Unleaded 98), not sure what you guys would refer it to as. It was the fuel recommended by the manufacturer.
I'll give it a shot with rotating the wheel, so I have a few things to do now tomorrow.
As mentioned previously, maybe in another post, when I first received the kit and was putting it all together, while feeding in the chain and rotating the front sprocket, I could hear like a pumping and suction sort of sound, like the sound of when you start a lawn mower and pull the string, and initial bit. So everything's good. Now when I try that, I hear nothing; it just rotates.
It was extremely stiff when it first broke down, but after coming home and taking the coil off (still connected to the wires as it was soldered on), and the two horizontal frames that surround it and the magneto (I'm guessing), I had a look to see for any loose wiring on the back side, just in case, and all looked well. But as GearNut says, looks can be deceiving.
Anyways, I was unable to take the magneto itself off as trying to rotate the nut only turned the magneto instead, but same thing, just moved, no pumping sound. Put it all back, re-adjusted the clutch so that it wasn't getting eaten too quickly, and was able to make it rotate easier and not so stiff anymore.
I had checked my spark plug which was covered in black so there was definitely a bad carbon build up, tried cleaning it using the sandpaper trick like you would with a car spark plug, as a temporal fix, tried to start the motor, and nothing. When I engage the clutch, the bike would just come to a rapid stop. The pumping noise is so minuscule, it was mainly just rotating and nothing was really pumping through to start.
I will have to check the pistons tomorrow to see if they are still functioning, and the fuel vapor and spark thing you mentioned.