Piston_Pedals
New Member
- Local time
- 7:34 AM
- Joined
- Jun 29, 2020
- Messages
- 12
I am building my first motorized bike and my motor kit just showed up today. I am super excited about it. I have a fair bit of experience with cars/trucks and other mechanical + electronic stuff... But this is a whole new avenue for me. It's something I've wanted to do for many years. I've been doing a lot of research on the basics of these motors to try and get a head start knowledge wise before it showed up on the door step.. I can build a car engine, but I am a noob to these little 2 stroke engines through and through. I haven't had time to really dig into it today... But I did open the box and took a brief look at the engine and immediately have a question..
Seeing reports of people with backwards pistons and whatnot from the factory, I pre-made the decision to at least tear down the top end of this thing and go through it before I fire it up. Upon opening the box and removing the motor (It's supposed to be a Zeda 80, it has all the upgraded allen bolts and a large round exhaust port)..... I looked in the exhaust port, and in the center it (kind of) has the vertical piece you can see in this person's photo below. It's the part that everyone says is there to keep the rings from catching on the port... Only issue is.. The center of that vertical piece is missing in my port... So it looks like it has a little spike on the top and bottom... otherwise, the port is cast better than a lot of photos I have seen of other new motors... At least judging from a quick look from the outside. I can take a photo of the port tomorrow when I have good light.
*example of the piece that is partially missing in my jug*
Has anyone heard of such a thing? If so, is it a problem? I would think being it's not continuous that the rings might want to hang up due to it being spike like (I haven't attempted to rotate the motor yet).. If it's a problem, should I just grind it out? I assume that the race guys are opening these ports up bigger than the stock one without ring problems, so maybe grinding it out could be fine? Or should I ask the vendor to send me a new jug? I also wonder if the missing chunk is down in the crankcase...... or if it happened when it was cast and isn't inside the motor........
Also, do the head studs in these stretch a lot? Should I replace them with better ones while I have it apart? If so, any recommendation on what to buy and what length?
Seeing reports of people with backwards pistons and whatnot from the factory, I pre-made the decision to at least tear down the top end of this thing and go through it before I fire it up. Upon opening the box and removing the motor (It's supposed to be a Zeda 80, it has all the upgraded allen bolts and a large round exhaust port)..... I looked in the exhaust port, and in the center it (kind of) has the vertical piece you can see in this person's photo below. It's the part that everyone says is there to keep the rings from catching on the port... Only issue is.. The center of that vertical piece is missing in my port... So it looks like it has a little spike on the top and bottom... otherwise, the port is cast better than a lot of photos I have seen of other new motors... At least judging from a quick look from the outside. I can take a photo of the port tomorrow when I have good light.
*example of the piece that is partially missing in my jug*
Has anyone heard of such a thing? If so, is it a problem? I would think being it's not continuous that the rings might want to hang up due to it being spike like (I haven't attempted to rotate the motor yet).. If it's a problem, should I just grind it out? I assume that the race guys are opening these ports up bigger than the stock one without ring problems, so maybe grinding it out could be fine? Or should I ask the vendor to send me a new jug? I also wonder if the missing chunk is down in the crankcase...... or if it happened when it was cast and isn't inside the motor........
Also, do the head studs in these stretch a lot? Should I replace them with better ones while I have it apart? If so, any recommendation on what to buy and what length?