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  #8671  
Old 05-23-2016, 11:54 AM
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tgaydos tgaydos is offline
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Default Re: what did you do to your motorized bicycle today?

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Originally Posted by mogollonmonster View Post
It worked!!!! Runs much smoother now, almost no fourstroking at all, just a little before it warms up. It definitely leaned out a bit too, no more flat spot in the throttle, and my plug looks good. Lots more power throughout the rev range, but especially down low. I was given another stock exhaust, this one has a significantly longer header, which will clear the pedals better, and should help the lower end a little, I'll dink with it later.
very nice man, getting your port job right is always a good feeling. what kind of exhaust are you changing to?
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  #8672  
Old 05-23-2016, 01:04 PM
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Default Re: what did you do to your motorized bicycle today?

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Originally Posted by mogollonmonster View Post
So yesterday, I bought some gasket maker, needle files and a fresh pair of big girl panties, pulled my jug, and finally cleaned the slag out of my exhaust port.

A note to all fellow patrons of Ace hardware. General brand, carried by my local ace is junk. I wore out the round and half round files in no time at all. Either of the other two sets at my ranch would be untouched, these craptastic files are almost smooth after their battle with the best beer cans China has to offer. The handle and case that came with the set are of higher quality than the files.

Beyond all that, this was the first port work of any kind that I've ever undertaken. I hope I didn't screw anything up lol, I made sure to bevel the edges to avoid ring snag, and only made the opening of the port match the port itself.

I've got to remount the motor into Tanglebones and wait for the exhaust gasket sealer to set up. Stand by for testing.

It was probably the hard chroming that took out your files. Did you check the smoothness of the edge leading from the cylinder? It's possible that a burr from the filing could cause a problem with the ring after a while. Drawing Emory cloth from the inside of the cylinder out of the port will remove any possible burr. Work it from the bottom and from the top, breaking the edge.

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  #8673  
Old 05-23-2016, 08:16 PM
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mogollonmonster mogollonmonster is offline
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Default Re: what did you do to your motorized bicycle today?

No Dave I think it was the Taiwanese scrap iron they were made of. I tried one out on a chunk of scrap aluminum with the same results. The files just suck is all, no biggie. I did use some emery cloth, everything worked out beautiful.

Getting the Dax banana pipe...
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  #8674  
Old 05-23-2016, 09:43 PM
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Default Re: what did you do to your motorized bicycle today?

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No Dave I think it was the Taiwanese scrap iron they were made of. I tried one out on a chunk of scrap aluminum with the same results. The files just suck is all, no biggie. I did use some emery cloth, everything worked out beautiful.

Getting the Dax banana pipe...
That's just sad, I hate bad tools and there's a lot out there these days and improperly hardened files a complete waste of money, time for a good set
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  #8675  
Old 05-23-2016, 10:56 PM
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Default Re: what did you do to your motorized bicycle today?

I have a really good set, and a "junk" set, both are much better files. Regardless, job is done, bike runs better than ever, so I'm satisfied. Now I know for the future. This time, it was either buy a set or ride 50 miles for what I had, next time, I'll take the ride. Trash tools being what they are, I thought I'd warn my fellow customers, as I know many of us shop at ace quite a bit.

Hoping to place my order with Dax tomorrow afternoon, for the expansion chamber, and possibly other goodies if my budget allows. As money comes in, ill be starting a second build, thus, Tanglebones, with all his miles, becomes the test bed. The cylinder looks pretty good, and I'm happy with my port work. I believe the upper con rod bearing is going, but that's just a guess from the upper end noise. I know these ChinaGirls make a lot of racket, but this intermittent disturbance in the force sounds like a bearing. I didn't have the courage to pull the piston off, as I don't have another bearing on hand, Dax has them so no biggie there. I'm putting serious thought into notching the piston skirt at the intake port. Any thoughts on that?
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  #8676  
Old 05-24-2016, 11:28 AM
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YesImLDS YesImLDS is offline
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Default Re: what did you do to your motorized bicycle today?

On my builds I put the piston at tdc mark everyThing blocking the intake port on the piston with a sharpie then chop all that off. Less rotating mass and more intake timing that isn't excessive.
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  #8677  
Old 05-24-2016, 09:14 PM
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mogollonmonster mogollonmonster is offline
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Default Re: what did you do to your motorized bicycle today?

That was exactly what I planned to do, so I take it you approve sir? I won't be performing that task till a new upper con rod bearing gets here.
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  #8678  
Old 05-24-2016, 10:17 PM
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Default Re: what did you do to your motorized bicycle today?

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That was exactly what I planned to do, so I take it you approve sir? I won't be performing that task till a new upper con rod bearing gets here.
I have done it to every piston I've touched with these engines! It's hard to over do it and have bad effects. Some people do half moon shapes, but I just did a straight line across the piston with no problems at all.
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  #8679  
Old 05-27-2016, 11:42 PM
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Default Re: what did you do to your motorized bicycle today?

Custom made a 3-stage header. No bends, the first bend is composed of the first pipe cut into angled pieces, welded, then ground smooth. And did my header brace!! Every exhaust I have had so far shook itself loose and broken.
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  #8680  
Old 05-28-2016, 04:36 AM
MEASURE TWICE MEASURE TWICE is offline
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Default Re: what did you do to your motorized bicycle today?

Is that a tube at the top of the head bolts maybe? It melds with the exhaust tube for support?
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