grinding motor noise

[blaster 97]

hello i was wondering if anybody knows what could cause my motor to sound like the rings r rubbing the cylinder walls . u can also hear it when u push it n gear or turn the motor over
:-/

 

[Blaaster]

Maybee you have answered your own question, it very well may be the case, the piston is scuffing the bore. It may pay to take the head off and have a look. How is the compression it will be down a lot if you a ring problem.

 

[blaster 97]

thank you ill check the compression tomorrow. i had planed on having it bored eventually but if the cylinder is scuffed ill be forced to do it a lil sooner thanks again

 

[Blaner]

well your rings are supposed to run up and down the cylinder walls, thats their job, could also be really bad crank bearings, or ring flutter in their grooves, all point to worn out parts.

 

[blaster 97]

i checked the compression on a single kick it has between 75 to 80 psi

 

[Awk08]

at least 10 kicks with throttle wide open to check compression,
kick it till the needle stops moving, then report back

 

[blaster 97]

k i kick it with the throttle wide open till the needle stopped i got 130 pounds

 

[Blaner]

nothing wrong with that, decent compression. take off the exhaust and check out the piston skirt and rings up the port. what does the spark plug look like?

a vid of the bike running with the noise?

 

[blaster 97]

ill check it this weekend and ill try to get a vid of it running thanx

 

[blaster 97]

k i got a vid of this thing running not shore how good u can make out the noise but it sounds like a tractor running

 

[Blaner]

k put it on youtube and post the link