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General Minitrail Talk
Modifications
Trans mounted clutch... TRX90
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<blockquote data-quote="kirrbby" data-source="post: 168058" data-attributes="member: 3972"><p>This is all very good discussion IMO.</p><p></p><p>Honda must have 5 or 6 versions of that crank mounted semi-auto clutch. The ones pictured in post #37 must be the latest. XR CRF 50 & 70 types, or Chinese copies of them. Firepower357 Terry had told me there was a difference between the 50cc version and the 70cc version...those weights were one difference, and I thought there was one other difference. For bigger motors, he recommended the 70cc version of that xr/crf clutch, with TB's 3 disc clutch kit. Better holding power, and better operation than the earlier versions of the same clutch. As far a engagement speed and such, that's all over my head...outta my league at this point.</p><p>But I think the trx90 semi-auto with the trans mounted clutch is a better system yet. Honda designed it for the newer, bigger, 90-125cc engines that use a semi-auto. I know it works really nice on my 124cc, the only one I've ever ridden. </p><p></p><p>I might be moving a little too fast thru this thread...I'm passing over some of my own questions.</p><p></p><p>I'm planning 2 trx90 based engines.</p><p></p><p>1st one will be 114cc using the stock crank and clutch setup. With a 54mm cylinder and the stock trx90 head. I'm adding a kickstart. I'm not too concerned about this engine since it's just the stock setup, with a bigger bore. It's been done many times before...you can buy the BB kit everywhere. The lower end is mostly stock, and everything works together as Honda designed it...<u>everything gets oiled.</u> lol</p><p>I want to run this engine in a 90's CT, and/or a ZB50, and or a ATC70.</p><p></p><p>The 2nd one will be converted to a manual 124cc, using a bunch of good quality parts. I've tried to do my homework, but I'm still nervous about this one. 54mm Takegawa crank and cylinder. Eliminate the centrifugal clutch and run the stock 4 disc Honda clutch with the Taky clutch cover, small primary gear with extra bits. (The extra bits part is kinda tricky. But I think I know what I need.) TB V2 head and matching 54mm piston. Add kick shaft. </p><p>I want to run this motor in a ugly K0 CT70.</p><p></p><p>I was planning to run a 90's Honda stator and lightened flywheel. </p><p>Maybe that will still be too heavy??</p><p></p><p>I expect this engine to be similar to my 124cc semi-auto trx90 in my Dax. (My sons Dax now actually) But I expect it might rev a little quicker with less weight on the crank..? </p><p></p><p>I'm not a great engine builder, but I keep trying. You can research all you want and still come away a little confused. Someone can try to tell you haw to do it, but it's hard to get ALL of the details. You hear a lot of, "you might have to...to make it all work" Details are left up to the builder to figure out. I'll be gambling with some expensive parts.</p><p></p><p>This thread is to help me gather as much knowledge and info as possible, to give myself the best chance for a good result, on the first try.</p><p></p><p>I'll be posting my plans and progress as I build each motor too, to give myself the best chance...good result...first try.</p></blockquote><p></p>
[QUOTE="kirrbby, post: 168058, member: 3972"] This is all very good discussion IMO. Honda must have 5 or 6 versions of that crank mounted semi-auto clutch. The ones pictured in post #37 must be the latest. XR CRF 50 & 70 types, or Chinese copies of them. Firepower357 Terry had told me there was a difference between the 50cc version and the 70cc version...those weights were one difference, and I thought there was one other difference. For bigger motors, he recommended the 70cc version of that xr/crf clutch, with TB's 3 disc clutch kit. Better holding power, and better operation than the earlier versions of the same clutch. As far a engagement speed and such, that's all over my head...outta my league at this point. But I think the trx90 semi-auto with the trans mounted clutch is a better system yet. Honda designed it for the newer, bigger, 90-125cc engines that use a semi-auto. I know it works really nice on my 124cc, the only one I've ever ridden. I might be moving a little too fast thru this thread...I'm passing over some of my own questions. I'm planning 2 trx90 based engines. 1st one will be 114cc using the stock crank and clutch setup. With a 54mm cylinder and the stock trx90 head. I'm adding a kickstart. I'm not too concerned about this engine since it's just the stock setup, with a bigger bore. It's been done many times before...you can buy the BB kit everywhere. The lower end is mostly stock, and everything works together as Honda designed it...[U]everything gets oiled.[/U] lol I want to run this engine in a 90's CT, and/or a ZB50, and or a ATC70. The 2nd one will be converted to a manual 124cc, using a bunch of good quality parts. I've tried to do my homework, but I'm still nervous about this one. 54mm Takegawa crank and cylinder. Eliminate the centrifugal clutch and run the stock 4 disc Honda clutch with the Taky clutch cover, small primary gear with extra bits. (The extra bits part is kinda tricky. But I think I know what I need.) TB V2 head and matching 54mm piston. Add kick shaft. I want to run this motor in a ugly K0 CT70. I was planning to run a 90's Honda stator and lightened flywheel. Maybe that will still be too heavy?? I expect this engine to be similar to my 124cc semi-auto trx90 in my Dax. (My sons Dax now actually) But I expect it might rev a little quicker with less weight on the crank..? I'm not a great engine builder, but I keep trying. You can research all you want and still come away a little confused. Someone can try to tell you haw to do it, but it's hard to get ALL of the details. You hear a lot of, "you might have to...to make it all work" Details are left up to the builder to figure out. I'll be gambling with some expensive parts. This thread is to help me gather as much knowledge and info as possible, to give myself the best chance for a good result, on the first try. I'll be posting my plans and progress as I build each motor too, to give myself the best chance...good result...first try. [/QUOTE]
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Trans mounted clutch... TRX90
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