1987 yamaha champ 100

hi i have a 1987 yamah champ that i had rebuilt last summer it ran great for a while but a buddy of mine borrowed it for a day and when he brought it back it ran like it had a bad plug so i changed it but it still runs very bad it pops and sputters and wont idle if anyone could give me some advise it would be greatly appreciated ty lon

[knotheadracing]

Hello I think I may have a few tips that might help . First thing I would check is the ground from your coil to make sure it is not loose and if that is ok check your main jet to make sure you do not have any dirt in it . All it takes is one grain of dirt to mess up your jetting. Hope this helps

[Spike99]

Also check the gas inline filter (if it has one) and why type of gas he/she may have put in it. Who knows that type of gas they may have poured in. If pre-mix, check the oil mixture in your tank. Might be worth dumping and re-filling.

Also check its choke (auto or manual choke???) and the condition of its air filter. The air filter could be so plugged, its acting like the choke is on.

Also check it mufflter &/or Spark Arrestor. Many call these "a carbon & crud container". Ensure it isn't full of stuff and causing too much back pressure.

Hope these ideas help as well...

.

thanks guys i'll try what you said

Just to let all of yall know I have a complete yamaha Champ and I am parting it off so if yall need parts email me and I will get back with you on prices and the items you need ccpcoolman@comcast.net

[bdwild32]

chris pratt , do you still have the 87champ ,i need parts looking for a good cdi box also the ignition switch.depending where bike is located maybee whole bike .email me at bdwild32@hotmail.com .im in michigan . ive been trying to email you , but it wont go through

[bdwild32]

been trying to get with ya .i need parts .looking for good cdi box an ignition switch .email me bdwild32@hotmail.com