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My Yamaha YL1 100cc Road Racer |
This is how it looked when I built it in 1967. It wasn't quite as fast as a good 125 but handled better and weighed 150 lbs.
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This is how it looks after I changed the rake and trail and used baby Ceriani forks. It now handles like my other frames. I also put a TA125 motor in it. This bike uses Bridgestone 2.50-18 race tires you can get at a Honda dealer. |
My new method of holding sections together for welding the new pipes. Made from a piece of chain, threaded rod and a couple of bars. |
The new pipes finished. I got the dimensions from Kevin Cameron. Also decided to start using air cleaners. I think it's faster than my MT125. With the new pipes it makes 28 hp at 14K. I also did a little work on the transfers which Kevin recommended.
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I made a still air box for the filter
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New TA125 heads. I had to make these after I destroyed one of the originals. This was before they were deburred.
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New head beside an original after abrasive finishing. |
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The required oil pan even though I've never seen anything come out the bottom of a two stroke |
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The crankcase originally had pieces cast into it to stuff the lower end for higher crankcase pressure.
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I cut it all away for better flow up into the transfer ports. I'll soon see if that works. |
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I slotted the rods and honed out the big end for .001" more clearance. This seems to help the big end live.
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Now I also slot the small end. Hope this makes the needle bearings live. |
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Clutch and straight cut gears from a 1984 YZ125C |
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I may be getting a dry clutch soon. |
The next project will be to weld up the combustion
chambers on some RD200 heads and machine them to fit. They have much larger
fins and will cool better plus I had a crank failure and ruined one of the
special heads I machined.
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I also have to modify the chambers to lower
the peak RPM. I think 14K is just too much for the rod bearings. WE ran at Loudon the next week and it's faster than my RD200. I beat my son and he's a faster rider than me but the TA gave me the advantage. Unfortunately half way though the 2nd race the needle bearings in the small end gave up.
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