bike going slower

Air filter is dirty thus restricting air flow.

Crud in carb or clogged up fuel filter.

Throttle cable is stretching. (I'm reaching a bit on that one.)

You're gaining a lot of weight by not pedaling.

How are those?
 
check all of your bolts over, make sure it's still mounted tight to the frame.
Mix ratio?
Chain tension, not loose, not really tight.
 
well you take out the airfilter and wash in sink with dish soap and water and let dry then put back in. the sparkplug,well just change it.
 
You can also clean the spark gap with a piece of emery cloth or sandpaper. You should also get a feeler gauge so you can set the gap. Available at almost all hardware and auto parts stores. Of course the correct gap setting will vary depending on who you ask. It is one of those things where just about everybody will have a different opinion.
 
Finfan said:
You can also clean the spark gap with a piece of emery cloth or sandpaper. You should also get a feeler gauge so you can set the gap. Available at almost all hardware and auto parts stores. Of course the correct gap setting will vary depending on who you ask. It is one of those things where just about everybody will have a different opinion.
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I use a piece of .032" stainless safety wire to gap plugs. Lots of that scattered around and motor runs better with slightly bigger gap than recommended.
 
take your air cleaner cap off and check the brass nut that holds your choke in place . Mine worked loose and the choke flap would slightly close as the engine would increase in revolutions . it will cause you to loose power . Use a little loctite on that nut . Good precaution even if it isn't the real problem .
 
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