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General Minitrail Talk
Modifications
Trans mounted clutch... TRX90
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<blockquote data-quote="kirrbby" data-source="post: 170225" data-attributes="member: 3972"><p>Thanks for the heads up fatcaaat. I had seen where you posted about the trx90 flywheel before. I actually used a xr70 flywheel as I built this engine, but I've now switched to the TRX flywheel.</p><p></p><p>One thing I've learned from building these motors, the keyway in the crankshaft points directly at the timing mark on the head when it's turned to TDC. So with NO flywheel on, you can get the crank turned close, just by eyeballing the keyway.</p><p>Just before installing the head, I usually pull the cam chain to a point and spin the crank to point the keyway right toward the point in the cam chain. Then i put that chain link on the O on the cam gear. </p><p>Also when the cam timing is at TDC, the cam, and crank, will turn back and forth easily about 100-150 degrees...easily enough that you can spin the crank without needing the flywheel on to do it. If the cam timing is on the wrong stroke..."waste stroke"??... the cam and crank will only spin a few degrees each way before it hits a cam lobe. Then you'll know it's on the wrong stroke...for setting valve lash etc, even if you cant see the cam gear.</p><p></p><p>So, when you are at TDC, on the correct stroke, the cam gear will line up the O on the timing mark on the head, AND the keyway on the crank will also be pointing at that same timing mark, AND the crank will spin back and forth easily... then you know all is well.</p><p></p><p>(I know YOU don't need a lesson fatcaaat. I was just sharing some info.)</p><p></p><p>My motor IS ready to mount and test now, but I still haven't brought a bike home to mount it into. I might bring one home from storage tomorrow or Tuesday. I bought a hardened bolt and made a new clutch pusher gadget that I like a little better. I installed that pusher. I added a single washer on to the end of the shift shaft while I was in there...that fixed the excessive side to side play in the S shaft. I decided NOT to mess with swapping in HD clutch springs yet...until I see how everything is workin as is. I DID swap in the DRATV Z40 cam. I did a little grinding inside of the stator cover and then painted it up...ready to rock.</p><p></p><p>I'm gonna try running this engine in my 93 CT70, with a VM20, and a improvised exhaust. Hopefully I have a throttle cable that'll work.</p><p></p><p>I forgot to get a picture of my new clutch pusher piece before I installed it. But this is the bolt, and the dims I used. I just cut it for length, sanded off the sharp spots, and polished it up a little...easy peasy. I pictured the original pusher and it's dims too.</p><p></p><p>[ATTACH=full]56392[/ATTACH] [ATTACH]56393[/ATTACH] [ATTACH]56394[/ATTACH] [ATTACH]56395[/ATTACH]</p></blockquote><p></p>
[QUOTE="kirrbby, post: 170225, member: 3972"] Thanks for the heads up fatcaaat. I had seen where you posted about the trx90 flywheel before. I actually used a xr70 flywheel as I built this engine, but I've now switched to the TRX flywheel. One thing I've learned from building these motors, the keyway in the crankshaft points directly at the timing mark on the head when it's turned to TDC. So with NO flywheel on, you can get the crank turned close, just by eyeballing the keyway. Just before installing the head, I usually pull the cam chain to a point and spin the crank to point the keyway right toward the point in the cam chain. Then i put that chain link on the O on the cam gear. Also when the cam timing is at TDC, the cam, and crank, will turn back and forth easily about 100-150 degrees...easily enough that you can spin the crank without needing the flywheel on to do it. If the cam timing is on the wrong stroke..."waste stroke"??... the cam and crank will only spin a few degrees each way before it hits a cam lobe. Then you'll know it's on the wrong stroke...for setting valve lash etc, even if you cant see the cam gear. So, when you are at TDC, on the correct stroke, the cam gear will line up the O on the timing mark on the head, AND the keyway on the crank will also be pointing at that same timing mark, AND the crank will spin back and forth easily... then you know all is well. (I know YOU don't need a lesson fatcaaat. I was just sharing some info.) My motor IS ready to mount and test now, but I still haven't brought a bike home to mount it into. I might bring one home from storage tomorrow or Tuesday. I bought a hardened bolt and made a new clutch pusher gadget that I like a little better. I installed that pusher. I added a single washer on to the end of the shift shaft while I was in there...that fixed the excessive side to side play in the S shaft. I decided NOT to mess with swapping in HD clutch springs yet...until I see how everything is workin as is. I DID swap in the DRATV Z40 cam. I did a little grinding inside of the stator cover and then painted it up...ready to rock. I'm gonna try running this engine in my 93 CT70, with a VM20, and a improvised exhaust. Hopefully I have a throttle cable that'll work. I forgot to get a picture of my new clutch pusher piece before I installed it. But this is the bolt, and the dims I used. I just cut it for length, sanded off the sharp spots, and polished it up a little...easy peasy. I pictured the original pusher and it's dims too. [ATTACH=full]56392[/ATTACH] [ATTACH]56393[/ATTACH] [ATTACH]56394[/ATTACH] [ATTACH]56395[/ATTACH] [/QUOTE]
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General Minitrail Talk
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Trans mounted clutch... TRX90
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