I've build my first motorized bicycle. I put a 80cc Chinese engine on a mountain bike with no suspensions.
I mostly use it for mountain biking in the hills and off road, so I give the engine quite a beating. Especally the clutch.
I have a few issues, first of all, what are the pros and cons of running a richer gas-oil mixture, I'm currently running 65ml of oil to 1l of gas as I'm breaking the engine in. What would happen if I always run the engine at that ratio even after break in? Can someone give me a run down of pros and cons?
Let's start with the issues I'm having
4 stroking at full throttle (the engine starts 4 stroking when I stay at full throttle for a bit and the engine starts revving high)
Whenever I'm going at low to moderate speed, the engine 4 strokes at low to mid throttle. If I open up the throttle completely it doesn't 4 stroke until it revs really high
The issue is, I've done a plug chop, the spark plug has slightly tan and looks perfect, If I move the clip on the leanest position I'm scared I'll be running the engine too rich! I tested it at full throttle and mid throttle. What should I do?
2nd issue: low power, possibly low compression or bad clutch.
I have issues going up hills, the engine just doesn't have the power, I feel like there is a compression issue, the gasket on the cylinder is a joke, I feel like this engines lose a lot of compression due to those bad seals. How can I test if I have compression without a compression gauge? The engine does have quite a bit of resistente so idk!
3rd issue: very very loud clutch noises at full throttle.
Whenever I gain some speed, the clutch makes a TERRIBILY loud screeching noise, the more speed I pick up at full throttle, the louder the noise, its louder than the engine itself! The noise is that of a very old metal door opening.
I've put f*** ton of grease on the clutch gears on the right side of the engine. But that didn't fix it.
Im not 100 %sure it's the clutch making the noises. But it only happens when the clutch in engaged, at low speeds there is little to no noise, but the more I pick up speed the more noise!
Could it be that the clutch is slipping at high rpm? The adjustor nut is as tight as I can make it while still being able to turn the real wheel with the clutch pulled in.
Also the clutch doesn't seem very good, whenever I'm going up a hill or from a dead stop it's defently not as grabby as I would like it to be! However it might just be that I expect too much from this clutch? Any tips? Thanks guys
I mostly use it for mountain biking in the hills and off road, so I give the engine quite a beating. Especally the clutch.
I have a few issues, first of all, what are the pros and cons of running a richer gas-oil mixture, I'm currently running 65ml of oil to 1l of gas as I'm breaking the engine in. What would happen if I always run the engine at that ratio even after break in? Can someone give me a run down of pros and cons?
Let's start with the issues I'm having
4 stroking at full throttle (the engine starts 4 stroking when I stay at full throttle for a bit and the engine starts revving high)
Whenever I'm going at low to moderate speed, the engine 4 strokes at low to mid throttle. If I open up the throttle completely it doesn't 4 stroke until it revs really high
The issue is, I've done a plug chop, the spark plug has slightly tan and looks perfect, If I move the clip on the leanest position I'm scared I'll be running the engine too rich! I tested it at full throttle and mid throttle. What should I do?
2nd issue: low power, possibly low compression or bad clutch.
I have issues going up hills, the engine just doesn't have the power, I feel like there is a compression issue, the gasket on the cylinder is a joke, I feel like this engines lose a lot of compression due to those bad seals. How can I test if I have compression without a compression gauge? The engine does have quite a bit of resistente so idk!
3rd issue: very very loud clutch noises at full throttle.
Whenever I gain some speed, the clutch makes a TERRIBILY loud screeching noise, the more speed I pick up at full throttle, the louder the noise, its louder than the engine itself! The noise is that of a very old metal door opening.
I've put f*** ton of grease on the clutch gears on the right side of the engine. But that didn't fix it.
Im not 100 %sure it's the clutch making the noises. But it only happens when the clutch in engaged, at low speeds there is little to no noise, but the more I pick up speed the more noise!
Could it be that the clutch is slipping at high rpm? The adjustor nut is as tight as I can make it while still being able to turn the real wheel with the clutch pulled in.
Also the clutch doesn't seem very good, whenever I'm going up a hill or from a dead stop it's defently not as grabby as I would like it to be! However it might just be that I expect too much from this clutch? Any tips? Thanks guys