Sophomore Rider
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Post by nwhicks21 on Aug 11, 2013 12:08:56 GMT -5
So I got my 50mm bbk installed, and I cannot tell the slightest difference in the power it had before the install and now after. I installed a 20mm carb with  main jet with it, torque my head to 15ft lbs and it's getting about 120psi compression AFTER I squirted some oil in the top of the cylinder and did compression test...is that normal or what could be the problem that it's not performing like it should?? I was thinking it should have around 160psi but I'm not sure. I also ordered the a9 cam but don't think it's gonna help much, I pulled the plug and it was running lean so I richened the mixture a Lil. Please help me anyone, any tips and advise on anything to give this thing the power it needs would be helpful. Also it has sick exhaust and a free flow air filter if your wondering, I haven't had money for exhaust yet but I still think I should have a significant increase in torque the way it is. |
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Sophomore Rider
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Post by nwhicks21 on Aug 11, 2013 12:10:12 GMT -5
Stock exhaust I mean..
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Post by jjoshua20213 on Aug 11, 2013 12:32:22 GMT -5
I'm having the same problem. Got a new exhaust with same results. Only problem is I bought everything backwards and ran out of money. The only problem i'm having is getting more gas. Its kind of easy to tell if your being restricted by air flow in and out or if its another problem. Try the stock carb and see if it makes a difference. The carb I bought a couple months ago will not agree with any bike or jet for some reason so i'm stuck with stock epa carb with stock jet .__.. Did you install the rings right? All three rings neeed to be  degrees apart. (I'm talking as if the 3 oil rings are one) The three oil rings need to be 15 degrees apart. One way to rell if the exhaust is your problem is to take a test run without it. Just up and down the street not a full run. Are you 100% sure the cam chain is put back on the same way? one tooth wrong and it messes up the whole operation. I scratched the side of one link on the chain so I could make sure it lined up right. |
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Sophomore Rider
Currently Offline
Posts: 112
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Joined: May 23, 2013 14:46:26 GMT -5
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Post by nwhicks21 on Aug 11, 2013 13:19:45 GMT -5
I don't have the stock carb anymore. And the piston rings I set up the to two rings about degrees apart from each other on same side of piston so that each ring end gap was about 5 degrees away from the wrist pin holes, and on the opposite side of piston I did oil rings 15 degrees apart, I was told do them all 180 apart but I believe this is the proper setup. But even if the rings are wrong would 120psi cause it to not show ANY increase in power what so ever? And I'm positive timing is all correct, it starts up easy, runs and idles good, just not like you'd expect with the bbk, if you rode this thing you would never expect it had ANY mods done to it what so ever, let alone a bbk and larger carb! I don't understand |
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Post by jjoshua20213 on Aug 11, 2013 14:22:46 GMT -5
Have you changed the weights in the variator? Thats kind of a must with a bbk as the powerband has changed. You more than likely need to get lower weights, unfortunately part of tunning is trial and error. Stock gy6 50 is around 5.something or 6 grams ive found that going down slightly gives be better accel and top speed www.gy6150enginepartswholesale.com/popup_image.php?pID=27445 |
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main jet with it, torque my head to 15ft lbs and it's getting about 120psi compression AFTER I squirted some oil in the top of the cylinder and did compression test...is that normal or what could be the problem that it's not performing like it should?? I was thinking it should have around 160psi but I'm not sure. I also ordered the a9 cam but don't think it's gonna help much, I pulled the plug and it was running lean so I richened the mixture a Lil. Please help me anyone, any tips and advise on anything to give this thing the power it needs would be helpful. Also it has sick exhaust and a free flow air filter if your wondering, I haven't had money for exhaust yet but I still think I should have a significant increase in torque the way it is.
main jet
