Spree boggin at speed

[CHEVY-212010]

Spree is doin good except when i hit "25 mph". Its revving up real good up until then and then it just looses powah and boggs out. I have played around with the carb, seeing if it is a tuning issue, but i cannot find out what is wrong.
Thank you all for your help.
MIke

[Bear45-70]

Is the air box, air filter and air box lid on and everything sealed properly becuase ths sounds like a lean condition.

[CHEVY-212010]

http://www.sears.com/shc/s/p_10153_1260 ... blockType=

This is the air filter attached to the tube from the carb to the box.
I have the 44mm bbk kit on it
There is a #74 main in the carb

[Trafficjamz]

http://www.sears.com/shc/s/p_10153_1260 ... blockType=

This is the air filter attached to the tube from the carb to the box.
I have the 44mm bbk kit on it
There is a #74 main in the carb

put in a bigger jet or tape up 90% of that filter.

[CHEVY-212010]

ok ill try the tape and i think i have a larger jet i can try
thanks
MIke

[ae86guy]

you should have got a 85 jet with the kit if its from taz im running a 88 jet and a k&n pod filter in a custom adjustable air box with just the k&n bolted to the carb mine bogged down when approching wot then had to back off to get more speed i think more tuning is needed on your spree do plug chops see what colour the plug is

[CHEVY-212010]

i got a #95 with my kit, but im goin to try out an 80 something i have laying around, I did however tape up about half of my intake and it did cruse up to "30" Thanks for the advice ae86guy, you saved me from making another thread.
MIke

[CHEVY-212010]

Replaced the main with a #84 i had and it solved the problem, can now reach the 35 mark on the speedo, but a new thing is happening. When i try to exceed that mark it backfires and looses power.
thoughts or suggestions...
thanks
MIke

[Upshifter]

It may be an overly simplified answer, but I would make perfectly sure that the gas cap vent is not plugged up a little. If the vent becomes plugged, it won't allow the fuel to flow enough, and the engine will often run lean, and show all sorts of weird symptoms.

[ae86guy]

or now that you are allowing the motor to rev to its full potential you will propbably find its four stokeing at top rpm i would check the plug after a good wot run see if its leaning out if not then as far as i know it should be ok just when you start to four stroke just back off the throttle a bit your motor its kinda sounds like a rev limiter in a car get a tach and see what revs your pulling ill bet its high please someone correct me if im wrong

[PimpinSpree]

id put a bigger jet in. Check you spark plug, i bet it looks really white on the tip