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Post by 2strokd on Jul 22, 2014 8:21:14 GMT -5
We gotta learn somehow right? Lol, my first kit ended up with the base gasket upside down  Base gasket upside down? The top on the bottom and the bottom on the top.. I was talking to my neighbor and didnt even notice. I still think back at that and wonder how the heck i missed it. |
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Post by 2TDave on Jul 22, 2014 8:37:45 GMT -5
I didn't know there was a top and bottom. How do you tell?
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Post by 90GTVert on Jul 22, 2014 8:44:25 GMT -5
Look at where the boost port is.
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Post by 90GTVert on Jul 22, 2014 8:49:54 GMT -5
If you think that's bad, the first 2T I ever messed with (also one of the first engines I had apart period) I couldn't figure out why the cylinder didn't fit over the piston at first. Didn't realize there were locator pins in the ring lands. lol
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Post by 2strokd on Jul 22, 2014 9:06:36 GMT -5
I didn't know there was a top and bottom. How do you tell? yes, i should have been more specific. The boost port opening was facing down  |
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Post by 2TDave on Jul 22, 2014 9:28:04 GMT -5
Oh yeah, that would be a problem. Lol. I was thinking you were saying a front and back to a gasket not top and bottom. Thanks
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Post by oldgeek on Jul 26, 2014 21:54:56 GMT -5
I had to change CVT covers because I have not had the time to fix the loose clutch support bearing seat in my only vented cover. I was feeling lazy, and I didnt want to take the time to drill a bunch of vent holes in another cover. I had a cover with a busted out kick start so I decided to do some quick mods to it with the band saw. It was quick, easy, and very effective as far as venting is concerned.   You cant see it in the pictures, but I also cut a 2" slot in the end of the cover by the clutch bell. I wish someone sold some type of vented cover similar to the ones you can get for the GY6 |
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Post by 2TDave on Jul 27, 2014 5:22:37 GMT -5
Yep that will be effective for sure! Lol. That looks mean, like a James Bond car with spikes coming out of the wheels.
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Post by oldgeek on Aug 1, 2014 22:09:56 GMT -5
I have been looking for the source of a vibration since I got this motor put back together. I changed things a bit by using a thinner base gasket, and the motor seems more willing to rev up, but when I put it around 9250 RPM there is an added vibration different than the usual one I have been living with. I thought it may have been the crank getting worse, but I am pretty sure it has to do with the CVT because sometimes I can roll the throttle just right and avoid the vibration for the most part. I am not really sure if it is the new clutch input shaft, or the clutch or pulley or the belt slipping. I could really use some help here figuring out what is going on.
The CVT cover I chopped up and put on really keeps the CVT cooler, and there is a noticeable difference in the CVT operation without the eventual heat buildup you have with a CVT cover that is not vented very much. I think from now on I will use this hacked up cover to tune the CVT, and then switch back to a vented cover that still has a kick start when done tuning.
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Post by 90GTVert on Aug 2, 2014 7:23:27 GMT -5
When my TaoTao had vibration issues I tried swapping stuff one at a time to see what changed the vibration. It was a long process, but if it's not easy to spot that may help you discover the issue. The first sorta quick thing is to make sure you're indeed in the right area by removing the variator and starting the engine. If it disappears with the CVT off you know you're looking somewhere between the CVT and rear wheel/tire. If it's still there then you've got an engine issue.
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Post by oldgeek on Aug 2, 2014 10:43:39 GMT -5
When my TaoTao had vibration issues I tried swapping stuff one at a time to see what changed the vibration. It was a long process, but if it's not easy to spot that may help you discover the issue. The first sorta quick thing is to make sure you're indeed in the right area by removing the variator and starting the engine. If it disappears with the CVT off you know you're looking somewhere between the CVT and rear wheel/tire. If it's still there then you've got an engine issue. Dumb question but, Is it ok to rev the motor up to 10K with the variator off? will the starter gear be ok? I need to find a center stand to put on it, so I can look at what is going on while it is running. |
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Post by Corrosion on Aug 2, 2014 11:09:42 GMT -5
When I was looking for the Vibration in My Zuma @ 8500-9500+.( all summer ) I suspended the rear of it from the Garage Rafters with 4 Ratchet Straps on the rear rack. I was a solid 4 point mount. My Vibration was the Imput shaft bearing. in the transmission cover. The Zuma dosen't have a second one in the CVT Cover. Just a little radial play in the input shaft would vibrate like hell. Only happened at speed with the belt all the way down in the Sheave, like in top gear. So it would only show up at high speed's & high RPM. I assume the CVT belt position had a lot to do with it, as did the bearing. It was not an Extreme amount of play. I was surprised the new bearing fixed it.
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Post by oldgeek on Aug 2, 2014 12:01:58 GMT -5
When I was looking for the Vibration in My Zuma @ 8500-9500+.( all summer ) I suspended the rear of it from the Garage Rafters with 4 Ratchet Straps on the rear rack. I was a solid 4 point mount. My Vibration was the Imput shaft bearing. in the transmission cover. The Zuma dosen't have a second one in the CVT Cover. Just a little radial play in the input shaft would vibrate like hell. Only happened at speed with the belt all the way down in the Sheave, like in top gear. So it would only show up at high speed's & high RPM. I assume the CVT belt position had a lot to do with it, as did the bearing. It was not an Extreme amount of play. I was surprised the new bearing fixed it. What you describe is exactly what is happening! I just replaced the input shaft and the case bearing while I had the top end apart. There was loads of gear play in it and the area where the CVT cover bearing rides was worn bad. I guess it is possible the new shaft or bearing is bad. I hate to have to pull it all apart to put a new shaft in again. Which leads me to another issue. Where to buy a decent quality input shaft? I wish you could get decent quality parts for these clones as easily as you can the Zuma. |
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Post by 90GTVert on Aug 2, 2014 12:13:02 GMT -5
Is it ok to rev the motor up to 10K with the variator off? will the starter gear be ok? You can take the starter gear off too and use a drill to start it. If you needed to see if the starter clutch were causing vibration it would prob be best to put the drive boss and some washers on so you can secure it. |
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Post by Corrosion on Aug 2, 2014 12:19:45 GMT -5
I think a lot of it is the Clutch Bell & Clutch Assy. I know mine at 10K on the Stage 6 mkI and the R-1200. Would vibrate so violently, I would back off the gas. I wish I could take the rear pulley assemble to get high-speed balanced. If the motor is turning 11k, like in a MKI & a r-12oo setup. I bet the over-driven input shaft / clutch & bell are doing near 14-15k. The same parts in my 9k max setup last for a long-long time.
Put them in a high rpm setting. And that imput bearing doesn't last as long, and the vibration is back.
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