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General Minitrail Talk
Modifications
Trans mounted clutch... TRX90
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<blockquote data-quote="fatcaaat" data-source="post: 168029" data-attributes="member: 1656"><p>Here's what I once did...of course I did this before!</p><p></p><p>I had a honda wave crankshaft, which was the same as a trx90, except it was a 68mm stroke. I wanted to build a crazy interesting motor out of it, so I got a set of midblock chinese cases and stuffed it with a trx90 transmission and clutch. I added in a kickstart that matched the transmission and modified the cases so it would work. I used a set of Daytona TREX 150 cases, so it had the non-kick in gear setup. Once that was done, I took the 1-way clutch mechanism and modified it to be non-centrifugal by turning it all the way down and fill welding it solid and then turning it nice. Looked almost like a stock piece when I was done. Then I popped a normal chinese clutch cover on it and had a full blown manual clutch. This was 178cc when done. </p><p></p><p>When I built my "poor man's nice" engine, I was non-committal to that approach but it was effectively the same thing. I used an aasa 63mm crank, daytona trex cases, and a trx90 transmission, but this time I left the centrifugal mechanism intact. This gave me 157cc engine, semi auto. If I ever wanted to convert it, all i would need to do is swap the clutch cover and repeat the turning and fill welding as I did on the other build. If ever there was a regret, is that I sold this motor on, as I it was dead nuts reliable and fast. </p><p></p><p>Honestly, if I were looking to build a semi-auto motor, I'd built it damn near the exact same way I did the Poor Man's Nice except I'd consider adding a superhead to the top for even more power. </p><p></p><p>If you want to go 124 on a trx90 base, that's actually quite easy. Just swap the crank to the takegawa 54mm crank and switch out the crank gear from 18T standard on CT's to a 17T from an xr50 to match the clutch gear. Assemble as usual. </p><p></p><p>Also, a little tidbit of information. NEVER buy one of the aftermarket oil pumps on any 12v small block engine setup. Buy the TRX90 oil pump...same size as the Takegawa pump, and you can buy them new for about $7.</p></blockquote><p></p>
[QUOTE="fatcaaat, post: 168029, member: 1656"] Here's what I once did...of course I did this before! I had a honda wave crankshaft, which was the same as a trx90, except it was a 68mm stroke. I wanted to build a crazy interesting motor out of it, so I got a set of midblock chinese cases and stuffed it with a trx90 transmission and clutch. I added in a kickstart that matched the transmission and modified the cases so it would work. I used a set of Daytona TREX 150 cases, so it had the non-kick in gear setup. Once that was done, I took the 1-way clutch mechanism and modified it to be non-centrifugal by turning it all the way down and fill welding it solid and then turning it nice. Looked almost like a stock piece when I was done. Then I popped a normal chinese clutch cover on it and had a full blown manual clutch. This was 178cc when done. When I built my "poor man's nice" engine, I was non-committal to that approach but it was effectively the same thing. I used an aasa 63mm crank, daytona trex cases, and a trx90 transmission, but this time I left the centrifugal mechanism intact. This gave me 157cc engine, semi auto. If I ever wanted to convert it, all i would need to do is swap the clutch cover and repeat the turning and fill welding as I did on the other build. If ever there was a regret, is that I sold this motor on, as I it was dead nuts reliable and fast. Honestly, if I were looking to build a semi-auto motor, I'd built it damn near the exact same way I did the Poor Man's Nice except I'd consider adding a superhead to the top for even more power. If you want to go 124 on a trx90 base, that's actually quite easy. Just swap the crank to the takegawa 54mm crank and switch out the crank gear from 18T standard on CT's to a 17T from an xr50 to match the clutch gear. Assemble as usual. Also, a little tidbit of information. NEVER buy one of the aftermarket oil pumps on any 12v small block engine setup. Buy the TRX90 oil pump...same size as the Takegawa pump, and you can buy them new for about $7. [/QUOTE]
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Trans mounted clutch... TRX90
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