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Norm's 2 stroke repair center Having problems with your 2 stroke engine? Just ask Norm, he loves to tinker and troubleshoot engines

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  #21  
Old 06-16-2009, 12:28 PM
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Norman Norman is offline
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Default re: can't find an answer then ask here someone may be able to help!!

I would try to bend the pipe and if you can afford it see if you can get a tuned pipe they do more for these bike engines than most of the performance mods. A lawn mower muffler might work ok I haven't tried one I made myself a sort of tuned pipe for all my bikes with an attached muffler to keep the neighbors happy and so I don't go any more deaf.
Norman
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  #22  
Old 09-15-2009, 09:43 AM
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CHIPS X CHIPS X is offline
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Default re: can't find an answer then ask here someone may be able to help!!

Norman,

Do you know what size screw the carb idle screw is? Mine was backed out pretty far on the ride home and...gone. Now I'm running but she dies with every clutch engagement. Can you or anyone help? I have a Fastenal down the street so I bet I can fix it today if I can figure the size out! Thanks for all the help everyone! Chips
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  #23  
Old 09-15-2009, 12:14 PM
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Norman Norman is offline
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Default re: can't find an answer then ask here someone may be able to help!!

metric threads 4m dia. 0.7 threads



hope this will help
Norman
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  #24  
Old 09-16-2009, 02:09 PM
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furament furament is offline
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Default re: can't find an answer then ask here someone may be able to help!!

hay norm u ever have a problem whith the thing overheating? my old 49 will run around the block get warm and die out just started doing this and im at a loss it usialy runs nice could it be a lack of oil? or is there such a thing as bad 2 stroke oil?
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  #25  
Old 09-16-2009, 06:59 PM
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Norman Norman is offline
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Default re: can't find an answer then ask here someone may be able to help!!

plugged fuel filter or the in tank fuel strainer? cdi about to go south? old fuel sitting for
a long time in the tank? almost fowled spark plug?
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  #26  
Old 09-19-2009, 06:03 AM
barron909 barron909 is offline
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Default re: can't find an answer then ask here someone may be able to help!!

I have a 80/66 cc motor and the throttle twists but I don't even need to touch the throttle and the motor runs on it own, basically can just cross my arms and let the motor take me away as I balance myself. I wanna change that so when I don't touch the throttle, the engine doesn't drive just runs due to me pedaling and when I twist the throttle I can stop pedaling and let the motor take over...How do I tighten the cable or whatever it is I need to do...If this all made sense?
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  #27  
Old 09-19-2009, 09:03 AM
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furament furament is offline
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soo i went through the 48 cleened out the lines tank and carb new gas it runs but the choke is different now with 2 rings and new jug that might change wen i get the new setup broke in it coughfs out the carb???? and bougs down when warm i dunno would u worry abought a distinct knok rattle from a new 80 if the bottow end seems good its not broke in ether but it started to make bad sounds??
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  #28  
Old 09-19-2009, 10:10 AM
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Norman Norman is offline
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Default re: can't find an answer then ask here someone may be able to help!!

did you change out the cylinder and reuse the old piston? if you did what is the measurements of the old piston vs the measurements of the new cylinder. If you have too much clearances the piston will rattle. I referring to thousands of an inch which isn't much the piston is supposed to run will very little clearances. you need to measure the piston 90 degrees to the wrist pin top middle and bottom. measure the cylinder top middle and bottom.

Last edited by Norman; 09-19-2009 at 10:12 AM.
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  #29  
Old 09-19-2009, 09:59 PM
barron909 barron909 is offline
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Default re: can't find an answer then ask here someone may be able to help!!

How do I fix my throttle problem? It looks like it's too lose and the flow is not being blocked or something because without touching the throttle grip it runs on it own...Is that normal? This is my first motor.
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  #30  
Old 09-20-2009, 01:40 AM
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Default re: can't find an answer then ask here someone may be able to help!!

Hey Norman,

Please see my current thread: http://motorbicycling.com/f3/help-my...ust-11335.html

I haven't received much insight and I would very much appreciate your expertise! Thanks a BILLION!



- Nick
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