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Post by scrambler on Oct 22, 2016 11:34:08 GMT -5
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Post by scrambler on Oct 22, 2016 11:35:36 GMT -5
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Post by scrambler on Oct 22, 2016 11:35:58 GMT -5
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Post by tr1ppler on Oct 24, 2016 20:42:49 GMT -5
Love all the pics. Keep them coming
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Post by scrambler on Nov 28, 2016 1:15:34 GMT -5
Hey Folks, I was neglecting the TX project for a while, but this weekend I made some progress with the oil passages so I can upload some pics about these fun moments. First, I cleaned the cases as much as I could, then tried to understand the routing of engine oil so I could find out how to improve the lubrication that was clearly an issue in this particular bike, as shown on the above pictures. The way of oil is quite complicated in this engine, it`s untraceable (for me, at least) unless you mark the actual passages: As Argo and others here pointed out, the older engine version has some flaws in the routing that very likely results in flooding of the points. Also, if the rotor cover leaks, the pump has to fill the rotor cavity every time after starting the engine and this may lead to bearing failure down at the the crank and in the cylinder head. This can easily be fixed by simply bypassing the rotor cavity and channel the oil flow directly into the middle of the main oil gallery. I think that`s exactly how Yamaha fixed these issues in the later versions as well. Argo made a nice write up about this, I`m just gonna show how I made it on mine, so others can learn from my mistakes and may save some time. If we look into this channel where the hose going toward the cylinder head comes out, we can see a shiny thing on the bottom, which is actually a steel bearing ball. Argo said in his post that he drilled through this channel from the back, I have no idea how, that must have been a different engine, probably there are many different versions. This ball has to come out somehow. First, I started dremeling off the epoxy which is quite easy:
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Post by scrambler on Nov 28, 2016 1:19:31 GMT -5
After removing the plug a hex head shows up: It seemed impossible to get loosen this bolt so I heated it up: Then finally I made it.
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Post by scrambler on Nov 28, 2016 1:28:44 GMT -5
After removing the bolt we can have a nice look at the back of the ball: To pop this thing in here in the factory probably didn`t take longer than two seconds, getting it out took a little longer though. First I tried to hit it forward assuming that the ball can come through the threaded part upward. Well, that was a totally wrong assumption:
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Post by scrambler on Nov 28, 2016 1:43:24 GMT -5
So, what next? Two options: drilling a way out for the ball from above or from the back. I went with the latter one, after positioning the ball as forward as I could toward the main oil gallery. DRilling out the shoulder where the ball was popped into is quite difficult because the ball is exactly in the way. So I had to ruin my drill bit in several steps as getting closer and closer to the ball. This way the ball sits in the center of the drill bit while the edges do the job. And finally the ball just rolls out: To be continued.
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Post by tr1ppler on Jul 13, 2018 7:53:53 GMT -5
Hey Scrambler, Do you have any more pictures from the oil passages Mod? I don't have my cases apart yet to try and understand Argo's post well but if you have a recording of what you did I'd love to see the rest of it.
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Post by scrambler on Jul 13, 2018 12:52:02 GMT -5
Hi, OK, I`ll upload some more pics here when I got to it. It`s not an easy modification though, I spent a fair amount of time to do it. It also depends on your engine case, the earlier versions are built with aluminum plugs in the passages, the later ones like mine use steel balls, those are more difficult to get out.
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Post by tr1ppler on Jul 13, 2018 13:18:21 GMT -5
I know I have a 73 with none of the modifications but don't know if it is an "early version" of engine case or not. Thanks for all the help!
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Post by scrambler on Jul 18, 2018 0:15:31 GMT -5
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Post by scrambler on Jul 18, 2018 0:16:29 GMT -5
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Post by scrambler on Jul 18, 2018 0:19:03 GMT -5
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Post by scrambler on Jul 18, 2018 0:22:47 GMT -5
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