Need help with ignition issues...

[ugly_od_eb]

Wont rev past 4500rpm just breaks up really bad. Im runnin a 670TA with a weiand stealth intake. The 670TA is dialed in with factory jetting, Second softest secondary spring, and the biggest accel pump cam (brown). I can go from 800rpm idle and smash it and it lights the tires up and carries the rpm's but stops in its tracks at exactlly 4500rpm. Im entering a mudbog this weekend and i need some wheelspeed... this was the downfall last year.

EDIT: new wires plugs, cap/rotor. New distibuter guts also, New box as of a year ago, and MSD blaster coil.

 

[DirtDonk]

Another possibility is that your valve springs are at their limit and you're getting valve float. Or have they been changed to aftermarket?

Paul

 

[broncnaz]

Probably have to light of a secondary spring. Which is opening the secondaries to quick and is causing the break up. Install a firmer spring and see if it goes away. What ignition box are you running?

 

[gonzo9017]

I had the same problem with mine....come to find out i was running out of fuel at higher rpm's. It ran good up to about 4500 then would try to shut down. I adjusted everything.......and found my floats to be too low raised them and have not had a problem since.