Engine not reaching top end speeds

I got my motor back from my buddy who made a new bracket system for it including larger bolts for it. The problem I'm having now with it is the motor will bogg out and actually slow down alittle when I reach 30-35km. I thought it was the spark plug as it happened to be very loose and I tightened it good and took it out again and same problem. It's bogging out on me and I don't understand why it's being stupid like this. Everything is nice and tight. The spark plug is black on the bottom so I don't know if it's that.. It does run the motor just not what it used to.. The weird thing is that it's not riding rough anymore. Wiring maybe ? I can't see that being the issue. The wiring looks fine to me.

Tomorrow I will test it again as I have replaced the spark plug and I'm letting the carb air filter dry as I washed it really good with hot water. I also used carb cleaner in the carb as well. I did all this after my last test run and have no done gone on another test run yet.

Suggestions ? This is starting to get on my nerves...

My first guise is the float bowl might not be letting enough fuel in the other guise for a cause is clogged fuel filter. Be careful with the carb cleaner theres no lube value to it washing the oil temporarily off the rings....Also give this thing time to brake in...The stock filters in the tanks are famous for clogging . They will fall apart to . Recommend a in line fuel filter...

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It's broken in. I've had it at 44km before and I ran it all winter start to finish.

I ran it again and I managed to maybe squeeze an extra couple Km of speed. It's still bogging but not as bad.. It's like there is something preventing it from going a certain speed.

- Bad mix ?

- The clip is to low or to high and it's not getting enough gas ?

Suggestions ???

Head gasket leaking something else to consider is there oil residue there? Bad gas maybe? I wouldn't play with the clip if it ran right before. I once had a cdi break down on me The bike would bog down, and the cdi got pretty warm to the touch. When I condemned it I made one trip around the block with a hose coming off a propane bottle [ not lite ] This was a trick to add fuel artificially . You don't wanna keep running it this way theres no oil in the mix. Strictly a diagnostic tool. I also took care to tie things up well when I did it. Just a trip around the block told me enough.

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What Kind Of Oil Do You Use And What Is Your Mix At? Yes Get An In Line Filter And Get Rid Of The Stock Filter. Try To Tune Your Carb Better If You Can.

2 stroke fuel mix does not store well its best used in two weeks.

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One can do anything you set there mind to.... Do a good thing...

I just made a new batch. The gas sat in a Jerry can and the oil still in the bottle. I'm using Castrol 2 stroke oil. I tried playing with the idler while it was running and it has no effect on the engine at all. I have another carb I can try to see if it's the carb. Mix is 20:1 -22:1 In and around that.

Bump!! (filler)

How long has the gas been in the Jerry can?

How does it smell? You can tell bad gas, it has a smell that is not like good gasoline.

If your plug is black, I wouldn't think you are loosing power due to fuel starvation. You may even be a bit rich. When you get up to speed, does it just all of the sudden start acting up, or does it just not perform up to par once you are up to speed?

New plug time?

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If it ain't broke, and you mess with it long enough, it will be.