My name is Andrés, and I live in Argentina. I just bought my first bicycle engine, a 48 cc "golden kit"
chinese engine: I am very afraid of motorbikes, but I needed a light, reliable, and easy (ed: cheap) to mantain vehicle. I must say this is it! Parts are very inexpensive, maintanance is very simple, and the reaction and speed of this little engine are surprisingly good for town cruising (specially considering my 1.85 m and 90 kg -180 pounds- weight! haha), it can even take me over bridges without any issue. I love this puppy, and itīs near zero fuel consumption... compared to my 1996 Ford Escort RS, this is the glory!
I also wanted to thank everyone in the forum, since reading some of the posts was extremely useful during the assembly of my bike, especially the carburator`s dissasembly guide (L).
Iīve used the search option for a lot of topics, but i would like to ask a few questions since very few people have motorized bikes in my country (there isnīt even a legislation for this kind of vehicles...) and I donīt have a "comparison point" for this regards...
1) How can I know if my engine is running lean? I read in this forum that running lean can overheat the engine, melting the pistonīs head... and I would certainly NOT like seeing that in a u$170 engine kit (half a month`s salary :P)! At first I assembled the engine without the E-Clip in the carburator`s throttle slide and it kept "spitting" gas when accelerating. After reading the dissasembly guide I put the C-Washer (my kit did not have an E-Clip, but the carburator is the same with the "tickler" and the idle screw) in the 3š position from up to down (this should be the 2š richer setting, right?) and now it doesnīt leak anymore. Power is the same as before, engine sound has changed a little, so... how can I know if the setting is right?
2) Whatīs the correct tension for the chain? I put it in a setting where you can move it a little if you press with your finger. Is that correct or it must be very hard?
3) Iīve had a rough time with the exhaust system... first one of the (cheaply built) screws got cut when I was adjusting it, and then I lost the exhaust tip (the round shaped one with the little tube at the end) in my way home from my GFīs... Other than the very loud noise and the (small) burnt gas leak in the exhaustīs manyfold base, is this dangerous to use or bad for the engine?
4) How often should I check my spark plugīs state? My bicycleīs frame is pretty lousy (plain cheap mountain bike) so thereīs no space for removing the spark plug without taking the engine outside the frame, so thatīs quite a hastle
Thank you very much for your time, and I beg your pardon if I messed up with some partīs name... my english is second language, haha.
Andy, from Buenos Aires