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Old 08-04-2010, 11:14 AM   #16
dorkpunch OP
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Location: Blackfoot, ID
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Picked up a new chain yesterday and put it on this morning. Had to also fix the wires that got chewed up by the broken chain, and now my charging light is dimly lit. Still going to have to figure that out.

Decided that since it was wwaaAAAAYYY to loud, I needed to do something about it before my nieghbors got out their shotguns. Built a baffle to quite it down some.

First attempt: just a reverse cone. Quited it down a little, but nowhere near enough.





Second attempt: added a tube from another pipe I had, then stuffed a long thin curtain rod into that and drilled a bunch of holes in it. Then I stuffed that whole thing into my cone and packed the cone end with insulation. Worked great! WAY quite and actually runs better with some back pressure.





I actually used more insulation than in the pic, wrapped about 3 inches up the pipe from the cone.

Guess we'll see how long it lasts!!
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Old 08-11-2010, 02:58 PM   #17
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Been putting around the block, but yesterday I took her for her maiden voyage!!! Made it about 8 miles without any major problems... Other than a charging issue, a skipping chain cause the front sprocket is missing a tooth, and some trans. oil leaks. Runs great! VERY fun bike to ride, too!!!





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Old 08-21-2010, 04:10 PM   #18
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Great thread!
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Old 08-22-2010, 05:24 PM   #19
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Location: Blackfoot, ID
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Been tinkering still, had a couple other threads. One about my charging issue, which I ended up figuring out and it was just a stupid mistake:

http://www.advrider.com/forums/showthread.php?t=609916

And I popped the head off just to see how the top end looked. Seems to be a bit glazed and sounds like the consensus was that it is running rich, but it seems lean to me?

http://www.advrider.com/forums/showt...=610694&page=2

So far I've put 144 miles on it and other than it being WAY undergeared at the moment, its running pretty good.

It's sposed to have a 16t front and a 37 rear. My front sprocket was missing a tooth making the chain skip in 4th gear, so I picked up the only sprocket the local store had that would fit- a 14t. Geared it WAY down- tops out at 45 mph, or if you have a bit of a tailwind you can get it up to 50.

I finally got some other sprockets- apparently no one makes a 16t, so I got a 15t for the front and a 32 for the rear. I know, big change... we'll try it and see how it does. I just want it to be able to hold 50 - 55 mph cause of the roads I use to get to work. Will report back when I know how it does!
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Old 09-03-2010, 08:32 PM   #20
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Time for another update. Put the slightly larger (15t) sprocket on the front, didnt change a whole lot. The bike will wind out in 3rd and hits 45 mph, then when I shift to fourth it drops rpms but still wont push past 45. It also does this wierd thing where it will suddenly cut then rev for just a millisecond if its been held at WOT for a mile or so. Did some more checking, discovered I only have about 75 pounds of compression, so I'm going to try re-ringing it this weekend. Everything looks okay, other than the cylinder feels really glazed. Rings showed up today, popped the top end off tonight, I'll take it in tomorrow and hone it and do some more measuring. While I was at it, I started on the "blueprinting". Wanted to measure the port sizes and locations so I can start figurin this winter...

Was having a tough time getting my calipers in to the cylinder (its only 100cc's) so this is what I eventually came up with:

What I needed was measurements between all the ports and the port sizes.



Get some aluminum foil and roll it into a tube that just barely fits into the cylinder-



Get a balloon (or in my case, a laytex glove) and some compressed air, stick the glove in the tin foil tube, and inflate-




Kinda hard to see, but you can see the dent the glove made in the foil where the port is.




Remove the now imprinted tin foil, and measure away!



Final product, a doodle with numbers:

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Old 09-04-2010, 01:06 PM   #21
ctune80
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Nice, I have an old YG1 80 (72cc)

Are you going to port this bike and do some more tuning on it? Look forward to your progress!

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Old 09-04-2010, 01:37 PM   #22
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Eventually, yes, that is my plan. What I MAINLY want to do is build a pipe for it, but some light porting will probably happen, just have to see what looks like it will work the best.
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Old 09-05-2010, 08:58 PM   #23
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Man, I love sketchup.... Digitized my port measurements, heres what I came up with:



Been reading the Two Stroke Tuning book by A. Bell. I think the only internal things i'm going to change are the exhaust port width from 30.5 to 36 or 37 mm and possibly change the rear boost port timing by filing a tad off the top of the piston so they open a bit sooner. Need to degree my engine before I decide to change any timing though. Next step will be figuring out the pipe. Pretty interesting stuff the more I read about it!
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Old 09-09-2010, 05:23 PM   #24
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Rainy day, so I played a bit more. Had the top end off to hone and re-ring, figured that was a good time to degree my engine. Here's what I came up with:

printed a degree wheel of the internet, cut it out, and bolted it on to the crankshaft. Used a cheapo laser pointer set on the engine to light the degree, set the wheel to zero with the piston at top dead center. Kinda hard to see, but if you look close you can see the red dot at the 0.






Rotated it through, noting the degrees that ports opened and also the duration. Had to take the cylinder and piston back off to see the intake to get the degrees for the rotary valve.


Heres my digitized version. Not sure if its right, seems a little wonky compared to some that I've seen:

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Old 09-18-2010, 12:54 PM   #25
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Old 09-24-2010, 07:40 PM   #26
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Honed the cyl, put a new piston and rings in, still had pretty anemic compression... Been playing with my home made baffle cone and think I finally got it close to where it should be. That, or my rings are breaking in. Got an extra 10 mph out of it now, so it goes a whopping 55 mph on the flat!
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Old 09-27-2010, 12:30 PM   #27
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Nice!

I would build a trail machine out of it. But it's your bike. You can do whatever you like Nice going on the tuning!
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Old 09-27-2010, 03:39 PM   #28
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Your not the only one who has said that... but i've already got SEVERAL old, underpowered, underbraked, and undersuspended bikes that will beat you to pieces when you ride on the trail. This one is doing road duty- for now.
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Old 10-06-2010, 05:21 PM   #29
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been playing with my welding "skills"... Blah. monkeyed around some more with Sketchup and got a decent model of what the pipe is 'sposed to look like:



I didnt build the first looonnnng cone. got the second cone, belly, baffle cone, and stinger fabbed up out of some junk steel i scrounged up. Used the box and pan brake to bend the cones and then finished them off on the stake table. Wanted to practice my oxy/acet skills, so I "welded" it all up with the torch. Came out so-so, not to bad for a first attempt at an expansion chamber.





No. The welds are not pretty, but they should hold!

Going to weld it on to the stock header pipe which I still need to measure to see if its the right length. Fingers crossed!!!



That would be kadepunch lending a helping hand. Hope to get the rest of it tacked / welded tomorrow. No school!
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Old 10-07-2010, 08:52 AM   #30
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No school today. Whacked off the old pipe and got the new one tacked in and fabbed some mounts for it.







Just need to weld it all up and test it out. (fingerscrossed)
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