|
|
Post by orphansoul on Aug 11, 2012 13:15:55 GMT -5
Do you not have a local machine shop by you? They will normally do it for 20-30 and you will have it back the same day. No having to deal with shipping.
|
|
|
|
Post by OverReved on Aug 11, 2012 22:52:02 GMT -5
Just attack it with a dremel. It's just a scooter motor.
|
|
|
|
Post by inkyben on Aug 12, 2012 2:21:25 GMT -5
this thread doesnt make sense lol, did the OP delete him/her self?
|
|
|
|
Post by speed0meter on Aug 12, 2012 2:32:13 GMT -5
Ya, lol ! I thought it'd delete the whole post,
I didn't want to start a whole new 1 about "TIMING"
Post that was deleted was that I found a site that'll bore your
Cylinder for $30. I went to a shop here in La, & dude was talking like
$125-130.? So never bothered to check other shops thinking they'd all be the same.
|
|
|
|
Post by medman1952 on Aug 12, 2012 15:43:23 GMT -5
Yeah, you can only delete your post, a mod can delete a thread.
The last time I had a bore done at a shop it was a lot more than $20.00, but this is California.
I know that a lot of you may cringe at this idea. When I was a kid I had a cylinder that needed boring and went to the local Honda shop and talked to the mechanics there. One of them took my cylinder and bored it out using a automotive brake hone. Being more used to a car motor that amazed me, no bore bar used, no micrometer. He just kept honing it until the piston would slip into the cylinder and it worked.
Many years later I was working on a Honda Trail 90 I bought and it too needed a boring so I just did the exact same thing and just like before it worked just fine. It just takes a little patience and a good drill that can handle the load for a good amount of time.
|
|
|
|
Post by OverReved on Aug 12, 2012 15:59:16 GMT -5
Sounds about right Medman1952.
It was a popular misconception among my peers that this method you described was how engines were fitted to over-sized pistons. While it works the results can be less than perfect.
What-ever works!
|
|
|
|
Post by speed0meter on Aug 12, 2012 20:13:00 GMT -5
I do have an extra 59mm cylinder, I just might use that to experiment on.
Thanks
|
|
|
|
Post by medman1952 on Aug 12, 2012 20:19:24 GMT -5
don't forget to keep oiling the honing stones and frequently check the bore size with the new piston.
Oh one thing you should have a vice or some kind of clamp that will hold the cylinder.
|
|
|
|
Post by cheapeto on Aug 13, 2012 5:23:09 GMT -5
AND do NOT pull a spinning hone from the bore!! Let it stop inside of it.
|
|
|
|
Post by duosport on Jan 22, 2013 10:27:48 GMT -5
I came across this older thread on a search for honing. I have to replace a piston and I have a scratch on my cylinder that I aqm not sure is so deep that it requires boring out. I have never honed a cylinder before. I see that for my scooter there are a couple of optional pistons that I gather are over sized by the "OS" designation. One is 0.25 and the other is 0.50 If that is 0.25 mm over sized that is not very much at all. What is that like .001 of an inch or something? It would not take much to home to that specification. I realize this is not the proper way to do it but still, it should work fine right? Yeah, you can only delete your post, a mod can delete a thread. The last time I had a bore done at a shop it was a lot more than $20.00, but this is California. I know that a lot of you may cringe at this idea. When I was a kid I had a cylinder that needed boring and went to the local Honda shop and talked to the mechanics there. One of them took my cylinder and bored it out using a automotive brake hone. Being more used to a car motor that amazed me, no bore bar used, no micrometer. He just kept honing it until the piston would slip into the cylinder and it worked. Many years later I was working on a Honda Trail 90 I bought and it too needed a boring so I just did the exact same thing and just like before it worked just fine. It just takes a little patience and a good drill that can handle the load for a good amount of time. |
|
|
|
Post by cheapeto on Jan 23, 2013 14:58:06 GMT -5
I have only honed out cylinder bores for web pringing presses.
However, we did have to hold very tight tolerences, and the openings were about 5 inches wide, some up to 13 inches across.
I had an inspection department that would set up all my dial bore gages to my specs, and they would keep all our micrometers inspected to their zero marks.
We had to hold .0002 across the bore, and not let it *bell shape* . The cylinders weighted 3600 pounds, and the adapters in the bores, had to rotate, to go *on impression*.
I love to hone myself, use lots of oil, dont pull a spinning hone from a bore, and just keeping checking your diameter size after a few minutes of honing. Add some pressure to the hone in the bore, oil, hone, check it. You'll get it.
|
|
|
|
Post by duosport on Jan 23, 2013 16:36:10 GMT -5
I have only honed out cylinder bores for web pringing presses. However, we did have to hold very tight tolerences, and the openings were about 5 inches wide, some up to 13 inches across. I had an inspection department that would set up all my dial bore gages to my specs, and they would keep all our micrometers inspected to their zero marks. We had to hold .0002 across the bore, and not let it *bell shape* . The cylinders weighted 3600 pounds, and the adapters in the bores, had to rotate, to go *on impression*. I love to hone myself, use lots of oil, dont pull a spinning hone from a bore, and just keeping checking your diameter size after a few minutes of honing. Add some pressure to the hone in the bore, oil, hone, check it. You'll get it. I just finished honning my cylinder. I took a measurement of my cylinder in general before the hone and it was 38.8mm The spec for the scooter is for a 39mm bore so clearly I am not accurated with my cheap HF digital caliper. Anyway the scooter has about 3,000 miles on it so I am going to assume from my measurement that it has not enlarged any from original spec. After the hone my measurement was still 38.8mm so really not much material was removed clearly. It came out pretty good. Not bad for the first one that I have ever done. So what about the ports? The edges are very sharp. Should anything be done to them? |
|
