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Post by krisgenchev on Mar 27, 2020 9:00:08 GMT -5
The R has a perforated inner baffle cone,perhaps that wasnt welded right and is making that sound..Here is a pic of it in this report; www.pedparts.co.uk/blog/tecnigas-exhaustYes i did open it, it seemed like i where it meets together it was touching, there was like 2-3 dabs of welds , i put few more , same. As far as the kick stand , i try removing it i was that desperate .... same thing. |
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Post by Kenho21 on Mar 27, 2020 9:04:05 GMT -5
Are you sure it's not a body panel or something? I'd try kind of hugging the rear of the bike (avoiding anything hot) and seeing if the noise changes.
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Post by krisgenchev on Mar 27, 2020 9:13:37 GMT -5
Are you sure it's not a body panel or something? I'd try kind of hugging the rear of the bike (avoiding anything hot) and seeing if the noise changes. |
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Post by christopher on Mar 27, 2020 9:38:09 GMT -5
Just start using sheet metal screws, to hold the panels together, watch out for wires and hoses. Heavy amounts of sarcasm intended.
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Post by krisgenchev on Mar 27, 2020 21:11:11 GMT -5
Are you sure it's not a body panel or something? I'd try kind of hugging the rear of the bike (avoiding anything hot) and seeing if the noise changes. I am thinking of pulling the engine apart , i cant handle it lol , today i took the variator out , started the bike , there is nothing else that can possibly be making the noise,if i havent messed up the cylinder yet , what should my ring gap be ? where can i check that , the kit didn't came with any instructions ... Thank. |
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Post by Kenho21 on Mar 27, 2020 22:52:56 GMT -5
Are you sure it's not a body panel or something? I'd try kind of hugging the rear of the bike (avoiding anything hot) and seeing if the noise changes. I am thinking of pulling the engine apart , i cant handle it lol , today i took the variator out , started the bike , there is nothing else that can possibly be making the noise,if i havent messed up the cylinder yet , what should my ring gap be ? where can i check that , the kit didn't came with any instructions ... Thank. Before you start pulling it apart, did you try swapping the exhaust? After listening to the video again, it does sound more external than internal, but hard to tell via video. Does the sound frequency seem to change in proportion to the RPMs? FYI, if you’re in a computer and on the 49ccscoot.com site, there’s a floating widget on your left that has a “calculators” tab and that has a ring gap calculator. |
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Post by krisgenchev on Mar 27, 2020 23:08:57 GMT -5
I am thinking of pulling the engine apart , i cant handle it lol , today i took the variator out , started the bike , there is nothing else that can possibly be making the noise,if i havent messed up the cylinder yet , what should my ring gap be ? where can i check that , the kit didn't came with any instructions ... Thank. Before you start pulling it apart, did you try swapping the exhaust? After listening to the video again, it does sound more external than internal, but hard to tell via video. Does the sound frequency seem to change in proportion to the RPMs? FYI, if you’re in a computer and on the 49ccscoot.com site, there’s a floating widget on your left that has a “calculators” tab and that has a ring gap calculator. Thanks i found it, no didn't had a chance to pull the other bike out, tomorrow hopefully. Could it be the needle bearing on the piston bushing ? Its brand new and came with the crank but ... |
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Post by 190mech on Mar 27, 2020 23:53:37 GMT -5
I agree with Ken,swap the pipe out before opening the engine!
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Post by Zino on Mar 28, 2020 9:32:07 GMT -5
I agree with Ken,swap the pipe out before opening the engine! I agree with 190 mech and Ken totally The simplest fix is often the easiest it is Why Drs Thankfully prescribe 2 aspirin first before they grab the scalpel |
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Post by krisgenchev on Mar 29, 2020 14:54:43 GMT -5
Alright guys, i think i found the problem. I split the engine, couldn't resist, everything inside looks great , crank bearings, piston, rings, needle bearing ... everything but the play (left and right) on the crank. I know there is suppose to be some play, but this one seems excessive.What do you guys think ?
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Post by Kenho21 on Mar 29, 2020 15:29:59 GMT -5
Alright guys, i think i found the problem. I split the engine, couldn't resist, everything inside looks great , crank bearings, piston, rings, needle bearing ... everything but the play (left and right) on the crank. I know there is suppose to be some play, but this one seems excessive.What do you guys think ? Other will know better than me, but I don’t think play side to side would cause a sound like that. |
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Post by 190mech on Mar 29, 2020 16:02:36 GMT -5
That does seem excessive!Lots of the old school European 2strokers had slop like that,but had steel shims at the piston pin to keep the rod centered..So,I'd say somebody messed up on that crank build!I'd send that vid to the folks you bought the crank from,if they are good business folk,you should get a new one!!
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Post by ryan_ott on Mar 29, 2020 22:55:36 GMT -5
That’s pretty excessive... Stock is around .2-.4mm the malossi stuff I run has been .18-.22mm. Call up whoever you got it from and hope they take care of you.
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Post by mike49 on Aug 9, 2022 15:48:03 GMT -5
Any progress on this problem? My Yasuni R is having the same issue. At least I believe it’s my exhaust. It happens even when the ignition is off and I’m coasting. I might scope it to see if I can identify a broken internal weld.
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