New Rings, How do I re-install the cylinder?
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Hi, Do you have the rings on the piston already? That may be an area where you could break one. I'd use a snap ring spreader { kind of reverse pliers } to open them up and put in grooves of piston.
Look at ur piston, in both grooves you'll see where theres a pin inserted. This is to keep the ring from turning/rotating to a point where it could catch on a port. The split in ring is to be placed at this pin.
I put a little oil { 2 stroke or motor oil/whatever is close by } on piston & rings. Allighn splits with pins and push cylinder over piston gently.
Mine went on smooth. The bottom of the cylinder is beveled to press in rings as you push, but I was re-installing on used rings, the sharper edges of a new set may require u to help them a little.
Good luck
PS To all the "pro's" out there, Please add any clarifications or correct anything I may have left out something.
Look at ur piston, in both grooves you'll see where theres a pin inserted. This is to keep the ring from turning/rotating to a point where it could catch on a port. The split in ring is to be placed at this pin.
I put a little oil { 2 stroke or motor oil/whatever is close by } on piston & rings. Allighn splits with pins and push cylinder over piston gently.
Mine went on smooth. The bottom of the cylinder is beveled to press in rings as you push, but I was re-installing on used rings, the sharper edges of a new set may require u to help them a little.
Good luck
PS To all the "pro's" out there, Please add any clarifications or correct anything I may have left out something.
There is an anti-rotation pin on the piston that the ring gap has to line up with.
The ring gaps must align with them before installing the piston into the cylinder.
When you replace the rings make sure that you look at the inside edge of the rings and there you will see that there is a bevel on the inside edge make sure when you put the rings on the piston that the bevel is facing up toward the head and not down.
Simple thumb and forefinger.... Compress the ring onto the piston watch closely what you are doing don't force anything. Get one ring inside at a time. Its really pretty easy to do.
The ring gaps must align with them before installing the piston into the cylinder.
When you replace the rings make sure that you look at the inside edge of the rings and there you will see that there is a bevel on the inside edge make sure when you put the rings on the piston that the bevel is facing up toward the head and not down.
Simple thumb and forefinger.... Compress the ring onto the piston watch closely what you are doing don't force anything. Get one ring inside at a time. Its really pretty easy to do.
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You might read thru this link Bikenut Leaned one out and did fine. The higher alt here may be your jet deal? http://motorbicycling.com/f34/omg-i-have-tune-cns-help-30169.html
Here is my Latest ride. At only 49.8 cc http://motorbicycling.com/f47/goats-scsw-boxer-28531.html
I'll race ya when you think your ready lol.
Here is my Latest ride. At only 49.8 cc http://motorbicycling.com/f47/goats-scsw-boxer-28531.html
I'll race ya when you think your ready lol.
That will be a very cool bike! I still like those triangular frames. The chinas fit in there like a glove
Got my new rings on the piston in 2 min., now on hr 2 trying to get damn piston inside jug.....................FAIL
Pull the jug off the case, then install the piston on the rod. If the piston has the arrow on it make sure the arrow points towards the exhaust. Then slide the jug over the piston compressing the rings with your thumb and forefinger as you ease it down. Might take a couple tries , makes sure small pin on piston stays lined up with the gap in each ring.
You can do as boocher13 suggest, that is the cheapest way. I will post a bit more info on that method shortly. You can also buy or make a ring compression sleeve. The sleeve simply wraps around the rings and helps you compress them evenly as you push down on the cylinder. I have made some from hard flexible plastic before. flat thin plastic like what is used in milk containers. I used an old binder one of my kids had used for school. Cut a strip long enough to wrap around about 1 3/4 times around the piston and just wide enough to cover both rings. wrap it around the piston and pull on the end to compress the rings while you push down on the head. You may need three hands ! I don't like this as much as just using my fingers.
! I don't like this as much as just using my fingers.Here is some more detail on the method just using your fingers. Once you have the piston and rings installed on the engine case, slide the cylinder on to the piston until the bottom of the cylinder is touching the first ring. Make sure it is making contact all the way around. Use your thumb and index finger to compress the first ring. I like to start with my index at 12 o'clock and thumb at 6 o'clock with the notch on the ring at 9 o'clock. Press the ring with your fingernails while gently and evenly pushing on the cylinder. You may only get part of the ring to slide in, that is OK. Slowly and patiently keep going around the ring until you get it all to slide in. I found that if it does not go in all around, I go to the opposite side from where it is in and try to push that section in. remember to try and push on both sides all the time as you did when you started otherwise you may just be chasing the section that does not slide in around the piston. Be patient, once you figure it out you will find it easier. Make sure to keep the cylinder bottom parallel to the ring. If you don't it will not work. Once you get the first ring in, push the cylinder down until the bottom is touching the second ring, again, make sure the bottom is parallel with the second ring and touching all the way around. Now repeat the fun you had with the first ring. I you get bound up, gently pull up on the cylinder to get all of the second ring out and start over. I have pulled the cylinder up in frustration and managed to get the first ring out also at this stage. that can be very frustrating. Go slow, don't get frustrated. The ring will compress easier near the split. Remember gentle and even pressure to keep everything parallel. It does get a lot easier once you figure it out.
