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Joined: Jul 11, 2017 12:28:47 GMT -5
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Post by swampthing on Jul 12, 2017 13:00:08 GMT -5
rockynv thank you I'm definitely wanting to rule out any exterior problems before assuming its engine, as far as the crankcase breather goes I see what youre taking about. Off the valve cover is a hose that leads to the airbox which is where I originally found a large amount of oil buildup. However, there is no sponge inside the airbox, instead there is a chrome metal tube bolted to the head and it expells gases through a port in the valve cover and out an external vent with a sponge inside. It all seems to be unobstructed except for the passage within the cylinder head. I ran a piece of wire as far as I could through this passage and then tried to blow air though it thinking I could hear this air from the crankcase but it literally almost completely holds air, I can hear a faint whistle from inside but that's it, shouldn't there be more of a flow through there that should allow it to breathe better? Is it possibly plugged somewhere inside the crankcase?
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New Rider
Currently Offline
Posts: 2
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Joined: Jul 11, 2017 12:28:47 GMT -5
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Post by swampthing on Jul 11, 2017 13:09:10 GMT -5
Hey everyone, I'm seeking some advice on a scooter im working on, a friend of mine recently purchased not running. Hey I work at a shop right? great... Anyways I'm a small engine and equipment tech for a John Deere dealer but ive never dabbled in powersports equipment so I knew nothing about these until now. Its manufactured by ZHEJTANG TATZHOU WANGYE Power Co. What I guess is the model number printed on the rear cowling over the tire is MC-12-150. The Engine seems to be a GY6 150cc engine. He purchased it for little or nothing which still may not have been a great deal because I feel like this is in need of more repair than he thought. According to him the scooter has been sitting unused for 2-3 years! He was under the impression that maybe it just needed a simple carb cleaning like many small engines that were shoved aside to collect dust. It reeked of old gas of course, I also noticed the engine crankcase was full of a very runny gas oil mix. so first things first I cleaned the entire fuel system including disassembling and hot tanking the carb. Put it back together with fresh fuel, spark plug, oil, and I cleaned the air filter which was heavily saturated with oil and it ran great when throttled but would not idle and hard to start unless throttled. When it began to heat up it would also emit a large amount of blue smoke from the muffler. So before fine tuning it I decided to make a small test drive to see if the oil would clear out thinking maybe because of the way overfilled crankcase that oil had made its way into the exhaust. It never would clear out and gets worse as you ride it. I check the dipstick and see it is def consuming engine oil. I removed the muffler and tipped it on end and did not getting oil pouring out. My friend assures me its probably trapped in there and will burn out so he has me replace the carb to fix the idle which did nothing. I researched on the internet and have seen that adjusting the valves can correct no idle/hard start conditions if they are too tight not allowing valves to close which they had no valve lash at all, and that helped it idle a little better but it still will cut off. I adjusted both around .0003"-.0004". Despite what he says and does not know, I'm thinking the engine has been damaged somehow and possibly the piston rings/valve seals are shot. I compression tested the engine and got around 120-130 psi. I also performed a leakdown test and it passed showing low cylinder leakage. Everything seems ok to my knowledge but I'm no scooter man, so am I missing something here or do I possibly have internal damage based off what I've told you? I appreciate everyone's input and effort to help me, thank you.
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