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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Wed Aug 10, 2011 9:39 pm 
you can also run a center mono shock mount to help prevent cracking of the back part of the swing arm on the GY6 motor. it disperses the stress from the back of the swing arm that's caused by removing the right side swing arm brace and running only one shock.


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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Wed Aug 10, 2011 11:06 pm 
PRAY FOR MOJO wrote:
you can also run a center mono shock mount to help prevent cracking of the back part of the swing arm on the GY6 motor. it disperses the stress from the back of the swing arm that's caused by removing the right side swing arm brace and running only one shock.



this is also false .. i was running a centre shock

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Mon Aug 22, 2011 9:23 am 
Now I'm very interested about the center shock and the case still breaking what set up were u running?

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Tue Aug 30, 2011 8:37 am 
lawill15 wrote:
Now I'm very interested about the center shock and the case still breaking what set up were u running?

x2 i thought it would help?

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Thu Sep 01, 2011 10:41 pm 
dooder wrote:
roosterboyfred wrote:
This is very good info.Now, I'm not running a cvt cover, but do have the "Ankelbitter"cvt plate. It's 1/4 thick aluminum. I don't know if it will help so I guess I'll just have to keep an eye on the swing arm.



this does nothing .. mine cracked with the anklebiter ..



dooder wrote:
HIgrade wrote:
anklebiter takes place of a cvt cover, 1/4" 6061 is more than enough.


this is incorrect!!! my cracked case is proof

RUN FULL CVT COVER!!




dooder wrote:
PRAY FOR MOJO wrote:
you can also run a center mono shock mount to help prevent cracking of the back part of the swing arm on the GY6 motor. it disperses the stress from the back of the swing arm that's caused by removing the right side swing arm brace and running only one shock.



this is also false .. i was running a centre shock



If you read dooder's notes he says the Anklebiter is not enough to support the engine you must run a full CVT cover than the case will be more strong. He is running the Anklebiter with center shock mount and the case still failed cause of the A/B not supporting it properly. The Mojo center will work BUTyou must run a full CVT cover than you will have no problems with cracking cases :banger:

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Sat Sep 17, 2011 4:44 am 
DAMN!!

And I thought i was in the clear with the center shock mount and anklebiter plate.

Could have dooders rim offset be one of the main causes of the case cracking also??

I'm just curious.

I got a 12x6 4+2.

I wonder if anyone else cases cracked with a center shock mount and a fatty.

*edit*


oUtpUt wrote:
CVT cover save lives. My motor was held together when it was split in half from the right side. When I brought it in to RUCKSTERS for them to work on it, the minute the cover's bolt was loosen & removed, the motor split immediately. :shock:


I guess it don't matter if you got a full cover also.

He was running a non fatty with a full cover and it still cracked..

Bad batch of cases?? Hard riding??

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Fri Sep 23, 2011 2:47 pm 
I run a Version 1 Anklebiter on my 206cc GY and have had no issues.

Image

Achitdotcom has the same setup but he has the Monster 232cc and has had NO issue also. AND HE POPS WHEELIES! FYI.. We have the Anklebiter pushed further out

Image


Composimo runs the Version 2 but has the back plate up against the case. He is running a 187cc GY and has Had NO issue with his Case Cracking.

Image

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Tue Sep 27, 2011 10:21 pm 
Bumping this thread for a question for those who have had this happen (broken cvt case)...

I'm curious to know whats the average weight of the riders this happens too. Or basically who is the smallest to suffer from this? Anyone 150 or smaller? Do you guys think the riders weight matters much at all, or will it always break over time with out the cvt cover? Sorry I know thats more than one question... :lol:

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Tue Sep 27, 2011 10:47 pm 
Also, I wonder about which castings people have. I know Achi was working with Taida to produce a b-case style that I think had much better casting than a stock 150 case. Also, I think all of the b-case style are more from a Taiwan style gy6 that had better casting as well. I'm curious what Brahda and Achi have and if anyone running a different style casting than the 157QMJ has had a failure.

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Tue Sep 27, 2011 10:57 pm 
local here has a cracking case
full cvt cover
stock gy6 wheel no fatty
stock shock, so nothing rock hard
its just like everything made in china, no QC and completely random
you get lucky or you dont

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Wed Sep 28, 2011 12:30 am 
TT-350z wrote:
local here has a cracking case
full cvt cover
stock gy6 wheel no fatty
stock shock, so nothing rock hard
its just like everything made in china, no QC and completely random
you get lucky or you dont


did their case have the following relief cut out of it.

HIgrade wrote:
i suspect this is a known problem in Asia as my replacement taiwan case has a relief cut out in this area from the factory to get rid of the sharp angle. id recommend doing this yourself with a 3/16" drill bit
Image

seansean wrote:
Also, I wonder about which castings people have. I know Achi was working with Taida to produce a b-case style that I think had much better casting than a stock 150 case. Also, I think all of the b-case style are more from a Taiwan style gy6 that had better casting as well. I'm curious what Brahda and Achi have and if anyone running a different style casting than the 157QMJ has had a failure.


Achi is running a Taida B case now. It is much thicker and better than a normal B case, but a normal B case with a 150 cc would still be better than a non B case. The main problem with any chinese product is a lack of quality control. So the reality is even if everyone runs right side swing arm, dual shocks, and case cover, there are going to be some failures. So you just have to do what you can and be as safe as you can. If you are that worried and still want to run gy6, contact Achi and pay the money for the quality case. The ceramic bore on his new case runs cooler too. :)

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Wed Sep 28, 2011 12:32 am 
ill look this week to see if his is notched at the top
but his is cracked top and bottom and hes ballsy and welded it lol

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Wed Sep 28, 2011 12:41 am 
would welding some metal to that part of the case help further strengthen it? its aluminum right? there should be some room to add on to it right, maybe even on the inside too? or would the heat just make the aluminum more brittle? i think i read somewhere that in most cases of welding that the actual weld is stronger than the metal itself.

im trying to learn which engines to stay away from if the problem cant be preventented

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Wed Sep 28, 2011 12:54 am 
KACHOWkeith wrote:
would welding some metal to that part of the case help further strengthen it? its aluminum right? there should be some room to add on to it right, maybe even on the inside too? or would the heat just make the aluminum more brittle? i think i read somewhere that in most cases of welding that the actual weld is stronger than the metal itself.

im trying to learn which engines to stay away from if the problem cant be preventented


when you weld a joint(any joint regardless of skill) the area near the joint is heat treated, thus the metal properties are changed. So what would tend to happen if something is going to fail it is going to be in that heat treated section next to the weld. I think Taiwan has the right idea and you try to minimize the areas where stress can congragate(sp?) and lead to failure.

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 Post subject: Re: @@READ ME@@ GY6 TECHNICAL SERVICE BULLETIN
PostPosted: Mon Oct 03, 2011 10:58 am 
TT-350z wrote:
local here has a cracking case
full cvt cover
stock gy6 wheel no fatty
stock shock, so nothing rock hard
its just like everything made in china, no QC and completely random
you get lucky or you dont


IIRC when we went to the food truck thing he said that when he first got it going he ran it without the cover for a little while and noticed the crack and put it back on and welded it.

Runt

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