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Post by nwhicks21 on May 7, 2014 16:45:23 GMT -5
i was coming home from work today, going about 40 mph wot and i all of a sudden started deccellerating while holding wot, i took out my earphones and heard a loud knocking sound and instantly thought my scoot was blown up and airsal bbk was shot. i let off the throttle to halfway and noise went away and it was cruising steadily. i came to a stop and put it on the big kickstand to try to locate the noise, i opened up the throttle and to my surprise i heard nothing but a perfectly purring engine. so i held the rear brake and applied throttle to add a load and still no knocking. i took off again and this time it ran and drove like nothing was ever wrong, up to 45 mph was fine untill i slowed down enough while entering city limits about 30 mph and throttle again and the noise came back! its not a constant knock, only here and there while accelerating so i dont think its the piston but i dont know. why does it run perfect when im stopped and its running on the kickstand? i got home took tranny cover off, and everything is intact, everything was operating properly running with cvt cover off, so i checked compression which is 130. i think it was around 160 when i installed the kit over the winter. what is wrong?? someone help me
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Post by alleyoop on May 7, 2014 17:18:02 GMT -5
I think it is overheating and denotating, check your oil level also maybe you got some bad gas.
Alleyoop
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Post by nwhicks21 on May 7, 2014 17:26:59 GMT -5
oil is full, and gas is good im  percent sure. just checked valves and they are spot on. i spoke with tvnacman and he has been a huge help in guiding me through diagnosing the problem btw.. and his conclusion is crank bearing shot from over torquing the top end when i installed my 50mm kit over the winter. i used a torque wrench i bought from harbor freight, its kinda generic and doesnt always click like it should so even though i thought i followed the specs, i couldve done this wrong. i pray this is something other than crank or crank bearings tho, god help me, i dont have the time or the money for that right now. |
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Post by nwhicks21 on May 7, 2014 17:29:39 GMT -5
it is definately not detonation noise alley, it is hardware somewhere that is failing  |
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Post by alleyoop on May 7, 2014 17:38:22 GMT -5
Well if its a bearing you should be able to FEEL it turning the VARIATOR by hand slowly. It could also be the wrist PIN but they make noise after you let go of the throttle when the load is off. Also check the cam chain the tensioner may have retracted and now the chain is loose and slapping against the guide.
Alleyoop
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Post by nwhicks21 on May 7, 2014 19:03:20 GMT -5
well i think i found the problem, the piston is bent upwards at 2 points on the top of the top ring....how the does that happen??? if i knew how to post a pic i would
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Post by PCBGY6 on May 7, 2014 19:07:34 GMT -5
If you have a photobucket account you can post pics.
Piston failure maybe from running lean?
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Post by nwhicks21 on May 7, 2014 19:25:43 GMT -5
its bent up in 2 places 180 degrees apart, oposite of the wrist pin holes. the top of the ring groove is spread and bent up..i wasnt running lean tho
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Post by nwhicks21 on May 7, 2014 19:30:30 GMT -5
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Post by nwhicks21 on May 7, 2014 19:33:38 GMT -5
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Post by nwhicks21 on May 7, 2014 19:34:27 GMT -5
pcb i opened a photobucket account, now how to i add the pic here?
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Post by shalomdawg on May 7, 2014 19:42:40 GMT -5
howdy, I can't see any pictures but, from your description as the defect being at right angles(normal) to the wrist pin axis, I would guess the piston pin is frozen in the piston which then tries to tip the piston as it goes up and down in the cylinder. the piston skirt is probably broken off and in the bottom of the oil sump. that should show up as pieces in the oil which you could drain to see. just my ignorant two cents worth
lotsa miles and smiles to ya
ken
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Post by nwhicks21 on May 7, 2014 19:55:47 GMT -5
you are absolutely right! no piston skirt and i didnt even notice! so what caused my wrist pin to freeze and how do i keep this from happening again? and how to i get the metal out of my oil sump now??
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Post by alleyoop on May 7, 2014 20:06:31 GMT -5
Use this to post pictures much easier than photobucket: Alleyoop 1. Click on this link: tinypic.com/index.php2. Click on Browse, that will link to your computer. 3. Find what you want to load. 3. Click on the name of the picture 4. Click on OPEN 5. Click on UPLOAD 6. Click on the LINK that starts with IMG. 7. RIGHT CLICK and CLICK on COPY 8. THEN Come here to your THREAD ON DOC. 9. RIGHT CLICK and CLICK ON PASTE. |
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Post by nwhicks21 on May 7, 2014 20:14:33 GMT -5
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main jet
..BAD TO THE BONE..
Main Jet
