We tore down this blaster because it wouldn't shift. It ran fine.

We wound up boring .020 over. Got everything back together and she fired right up which, it will do every time. When we ride it it acts like it has a fouled plug. It will sputter and miss.

We noticed that if you cut the gas off it will run good right before it dies. So seems like its getting to much fuel. Prob is I don't know what to do to resolve the issue.

We cleaned the carb real good, and changed the fuel soaked plug. It has a 300 main jet with DG exhaust and K&N. One thing I noticed was the reeds. One pedal is spaced further apart than the other. How do we tell if they need to be replaced? Would they cause a problem?

 

The reeds will be cracked that could be one reason for this, wat do you mean that one is spaced out? or try changin your jet a 300 seems pretty big, try a smaller one around 260-270, i mean its worth a try

 

Thanks for the reply.
Ya, it's just the thing ran great before the rebuild with the 300 and now it wont hit the powerband.

About the reeds, what I mean is that if you hold them up you can see the the petals do not lay down flush with the cage. The one on the right sticks out away from the cage quite a bit more than the one on the left. Does that make any since?

 

Ya the reed situation that dont sound like thats right, they should sit flat on the reed cage , you know my do so thats why im saying this, u might want to change them first maybe

 

That's kinda what I thought. It's my first experience with a 2-stroke engine. I'll try and go from there. Thanks.

 

Since you just rebuilt I would check compression. If the pistons/rings are to small or the rings are not sealing for some other reason it could cause it to sputter and miss. Loose head bolts could also cause it. So could a blown head gasket but that seems unlikely becuase I believe Blasters use a copper gasket that is pretty tough. When you shut off the gas it will run lean right before it shuts down which can cause it to speed up a bit and give the illusion of running better.

 

Compression is good, especially compared to what it was like before the rebuild. You are correct on the copper gasket and we did check it just in case, it seems good.
I am aware that it will run lean just before it dies. That is why I tried it that way. With the fuel on it floods like crazy. The plug was covered in gas when we pulled it. When I lean it out by turning off the gas it stops the missing and sputtering.
Thanks for the suggestions TomM I will double check the gaskets and head bolts as you recommended.

 

I cant think of any way boring it .020 over could be the cause of flooding all by itself. If its flooding then something else has also happend during the rebuild. Could be the float is stuck in the carb or maybe got reinstalled in the wrong position. Or possibly the needle was not put back in the same spot. I assume you split the cases becuse you said it wouldnt shift. I would check the crankcase gaskets and seals also.

 

A bad electrical connection could cause weak spark wich could cause it not to burn the fuel as well wich could cause flooding.