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Post by 190mech on Jan 26, 2020 21:24:57 GMT -5
Yep,15 degrees is a popular base setting and if the mark doesnt move from the T point when revved,its a flat line.Nothing wrong with that as many race engines have been run that way...
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Post by oldgeek on Mar 21, 2020 17:09:05 GMT -5
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Post by oldgeek on Mar 21, 2020 17:09:24 GMT -5
The day before all the above happened, in an effort to make the pipe fit better, I ended up changing the rear tire from a 130/70-12 to a 120/70-12. Turns out I should have done that a long time ago because this thing was launching and pulling harder than it ever has. I hammered on this scoot last night and this morning really hard, had a blast while it lasted.
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Post by 90GTVert on Mar 21, 2020 19:05:53 GMT -5
As much as that sucks, anytime speed and potentially other traffic is involved, I'm glad to hear it wasn't a failure that involved any sort of lock up.
There isn't a huge difference in the 130/70-12 and 120/70-12 as far as effective gearing, but it is also lighter and the contact patch would likely change a little as well. I know I put a 140/60-12 on T2 years ago. That's basically the same diameter as a 120/70-12, but it felt like it lost power. I always assumed it was the weight and contact patch of the big tire.
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Post by aeroxbud on Mar 21, 2020 20:32:44 GMT -5
That's certainly a different type of failure.
Must of been a little scary at that speed.
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Post by jloi on Mar 21, 2020 22:46:24 GMT -5
yeah , I'll bet it was . glad you're ok. reminds me of when my belt broke .
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Post by 190mech on Mar 22, 2020 4:52:31 GMT -5
Dang!That fracture looks like its inside the taper,,when you remove the piece in the flywheel see if the key slot has any cracks in it,,I expanded the pic and it does appear to have 2 rusted areas from a long time crack..  |
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Post by oldgeek on Mar 22, 2020 12:07:47 GMT -5
    The fan was surprisingly well melted into the shroud and it took a bit of effort to pull it out. Ignore the punch marks on the busted nub, I had a brief brain fart and tried to hammer the busted stub out the front of the flywheel. It looks to me like it simply failed. Remember I previously had some issues with this crank on the variator side. The shoulder on the crank where the ramp plate sat cracked a bit and had to be "repaired" I think the issue is simply cheap crap steel. I have had a lot of fun with this motor build. It has been a strong combo, and I have learned a lot working with it. I think for now I am done with it. The cases need some epoxy replaced, and the gearbox repair has always worried me. Its time to prep another set of cases, and build a motor with the 54mm AC cylinder, or maybe even the 54mm LC cylinder that John gifted me. Also at some point I still want to finish building the 81cc aluminum triport motor that I quit working on due to the stupid defective crank. So many projects, so little time. |
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Post by oldgeek on Mar 22, 2020 12:33:19 GMT -5
There were not that many miles on this since I recently replaced the piston I trashed while trying to use the 28mm PWK. I think the plug, head and piston look pretty good.   |
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Post by 190mech on Mar 22, 2020 14:31:20 GMT -5
It was a 'good-un',didnt that crank come from Hawaii?We get all this cheap stuff and are the testers to see how long it lasts!  |
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Post by oldgeek on Mar 22, 2020 14:49:34 GMT -5
It was a 'good-un',didnt that crank come from Hawaii?We get all this cheap stuff and are the testers to see how long it lasts! Aloha! Its all krap, every bit of it. When it comes to scooter parts, Even the "good" stuff is mostly 2nd rate.  |
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Post by repherence2 on Mar 23, 2020 10:34:03 GMT -5
It was a 'good-un',didnt that crank come from Hawaii?We get all this cheap stuff and are the testers to see how long it lasts! Aloha! Its all krap, every bit of it. When it comes to scooter parts, Even the "good" stuff is mostly 2nd rate. That's probably why the good tuners here dont recommend strokers and ministrokers. They always swear by the stock honda crank mated to a Polini Corsa. Big strokers are said to be for limited use (weekend/non-daily driver). The ministoker cranks are said to be problematic too, in the fact that ministroker cranks from Taiwan fail too. What brand of crank is installed? Was it a Taida? |
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Post by oldgeek on Mar 23, 2020 10:59:49 GMT -5
.............What brand of crank is installed? Was it a Taida? It was a Phongeer 52.6 |
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Post by oldgeek on Mar 23, 2020 11:51:40 GMT -5
As much as that sucks, anytime speed and potentially other traffic is involved, I'm glad to hear it wasn't a failure that involved any sort of lock up. There isn't a huge difference in the 130/70-12 and 120/70-12 as far as effective gearing, but it is also lighter and the contact patch would likely change a little as well. I know I put a 140/60-12 on T2 years ago. That's basically the same diameter as a 120/70-12, but it felt like it lost power. I always assumed it was the weight and contact patch of the big tire. I checked and there is a 2" difference in circumference between the 130/70 Michelin and the 12/70 Pirelli. I don't know how much it affects gearing. And there is a significant difference of the contact patch between the two tires. The Pirelli is much smaller vs the Michelin. So maybe together the two differences was enough to make this scooter launch like mad. Honestly, I thought I would break a belt or something in the CVT would give as hard as it was pulling. Looking back, I wish I had just left this motor together, it would have been a perfect testbed to try and come up with an iggy like I mentioned. |
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Post by pitobread on Mar 23, 2020 21:21:31 GMT -5
Judging by the break and the color in the center, it was cracked for a while!
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