Poor midrange and decel.

[xjma]

So I got the blaster running pretty well. Idles nice and revs out well. The only thing is it runs kinda choppy at about mid throttle when I hold it there, like when I'm just putting down the road real slow like. If I hit it and rev through it, it seems fine. It almost has the same choppy problem when I decel without pulling in the clutch. the motor kind of bucks a little bit and maybe diesels? It will do a quick crappy rev on it's own during decel....weird. Any ideas? Thanx.

 

[burnin'_oil_2001]

did you richen the needle? that sounds like you are having issues with your midrange jetting. if you have not done it already i would move the needle clip down maybe one position or possibly two depending on if it is doing a lean or rich bog.

 

[xjma]

so you think that means I'm lean in the midrange??

 

[burnin'_oil_2001]

yes i do think it is. is the needle clip in the stock position? on my blaster when i added an aftermarket exhaust i richened all the circuits-- +1 pilot jet, lowered needle clip by one position, and put in a bigger main jet. i did all of this from research and recommendations from local engine builders. i was told that many people forget to richen the the other circuits when they modify their engines and the blaster tends to have a lean spot in the mid-range. it is a habit now that when i make a change to a stock engine i check all of the circuits to see if the jetting needs have changed.

 

[xjma]

This is a stock blaster, well, it's got an FMF silencer, stock pipe, TwinAir filter, no airbox cover....etc.

I wanted to get a larger pilot but the only place that had one near me only had a stock pilot...I guess I'll order a bigger one. I've got a 250 main in it and yes, the needle is in the stock position. I checked the plug while I was doing a breaking (just did new rings) and it was rich, but that was when I was sitting it and letting it idle for extended periods of time, and then just riding it around without going over 1/2 throttle. Maybe I'll check again! Thanx

 

[nofxfan125]

I second richening the needle. Move the clip down one position.

 

[L.T.]

IMO you are lean in your pilot jet to better it get a larger size or move your needle clip to position 3or even 4 but test both and see wich one is the best. also make sure that your air screw did not move and make sure it is at 1&1/2 turns out.

 

[xjma]

Sweet, thanx for the advice guys.