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Post by Kenho21 on May 31, 2020 15:02:47 GMT -5
 Looking to replace the stator side seal. It was going to easy using the 17x1 flywheel puller and a little WD40 on the stator nuts . This Last Screw is going to need some time for the wd40 to penetrate maybe heat . I really hate the soft screws yamaha uses on these scoots . I usually swap them out for allen heads . Do you have a hand impact driver? Those things work miracles on screws like that. I swap everything for socket head usually. |
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Post by mrchilled85 on May 31, 2020 15:05:21 GMT -5
Never found an easier way. Still don't like doing it. I actually brought a seal driver a while ago. Never thought I would, but it seats them at the correct depth. No guessing. where did you find one as i have been looking but not seen any around  |
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Post by mrchilled85 on May 31, 2020 15:18:03 GMT -5
Looking to replace the stator side seal. It was going to easy using the 17x1 flywheel puller and a little WD40 on the stator nuts . This Last Screw is going to need some time for the wd40 to penetrate maybe heat . I really hate the soft screws yamaha uses on these scoots . I usually swap them out for allen heads . i do the same as they all ways round off and cant get them out |
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Post by aeroxbud on May 31, 2020 16:53:42 GMT -5
Just a money saving measure. Annoying as the older stuff has a proper allen head bolt.
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Post by Zino on May 31, 2020 16:56:32 GMT -5
 Used Heat and WD40 No luck So I just used the extractor I am replacing the bolts tonight have to go to the store for the right length everything I have is way to long. So my Cylinder swap has got alot more involved replacing seals to fix the air leak,decking heads to get better squish . A half day project becomes a whole weekend project . |
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Post by aeroxbud on May 31, 2020 17:04:07 GMT -5
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Post by mrchilled85 on May 31, 2020 17:12:58 GMT -5
thanks was checking pedparts and other sites with no luck  |
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Post by Zino on Jun 1, 2020 19:48:03 GMT -5
That is a pretty sweet tool for installing Crank seals .
I've used a pvc tube in the past .
That is way quicker .
I wonder if you could fashion one out out a dowel of wood .
With the proper measurements
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Post by Zino on Jun 3, 2020 19:48:21 GMT -5
A buddy has a machine shop so I had him help deck the head .It would have taken along time to get .5 mm off the head and have it be right using figure 8 s on emory cloth on glass top table . He let my son see his shop and take alook around while he spun off .45 mm.  Before emory cloth  |
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Post by Zino on Jun 3, 2020 19:55:14 GMT -5
After a bunch of Figure 8's to get it smoothed out . I di ckean up the microscratches with some scotch brite pad work.  Ended Up using the second thinnest mestal spacer with copper spray and the head with just copper spray . I wanted to push this down below 1 mm squish . I will measure it up after 24 hours curing time on the copper spray. |
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Post by Kenho21 on Jun 3, 2020 19:56:56 GMT -5
Looks great!
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Post by Zino on Jun 3, 2020 20:08:13 GMT -5
I forgot to take pictures of the scotch brighted head and it all copper sprayed up .
I Just got home from the machine shop .
And wanted to get this thing buttoned up.
One other step I like to do is after all those figure 8's .
Is wash it up in a bucket of dish soap and bucket of water to get rid of all the aluminum dust before installing .
That polini head is the way to go to get your squish down below 1 and have your ports at the ideal position.
I had to shoot for below 1mm and give up a little on the port timing .
I would have increased squish to 1.1 or more after decking the head to get the transfer to match with the piston
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Post by Zino on Jun 3, 2020 20:12:09 GMT -5
Kenho
what are you peaking out fro rpms with your Yasuni R and Athena set up ?
I would expect my since port timing is lower than yours I probably wont hit as high a peak rpm mine power band will just start lower .
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Post by Kenho21 on Jun 3, 2020 20:20:42 GMT -5
Kenho what are you peaking out fro rpms with your Yasuni R and Athena set up ? I would expect my since port timing is lower than yours I probably wont hit as high a peak rpm mine power band will just start lower . So as of right now, I'm running 5.75gr rollers, and a 0.30mm drive boss shim. I like the tune and I think I'm close to maxing out my mph via belt travel and rpm, but I may drop down to 5.5gr rollers to see if I can get a few more rpm and mph. I'm getting 61mph GPS tucked on flat ground with no wind at ~10,200rpm and at ~230F. I'm wondering if 5.5gr or something llwer will get me a few hundred more rpm/mph... |
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Post by Kenho21 on Jun 3, 2020 20:24:21 GMT -5
I do see rpm get up to ~10,300rpm+ at times too, but never past ~10,500rpm.
And keep in mind that all of my numbers are kind of estimates because my gauge only displays rpm in incremental bars and each bar is 200rpm. I have a yellow light come on at 10,300rpm and a red light at 10,600rpm though. I've never seen the red light.
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