Powertrain Problems

[Eat-um-up]

When i start my 914 it sounds like its idleing beautifully and it will forever. Problem is that when it reaches 2500-3000rpm it spitters spudders and simply wont go any higher; as if its hit a brick wall and cant push though as hard as it tries.

My carborator tool tells me that at an idle all 4 barrels are sucking evenly, and it starts really easy.

here are my engine specs

2.0L
Dellorto carbs 40mm
009 distributor
clean run on the valves
85-90lb compression (yah low i know)

Thanks in advance
James

[Ron Meier]

How 'bout your main jets being plugged? As you come off idle and the fuel circuit transitions maybe you ain't gettin' fuel.

Advance mechanism in dizzy is frozen.

Dizzy is worn and point gap varies. At higher rpm the points are not being held closed sufficiently to saturate the coil.

Fuel pump not putting out correct pressure or volume - runs outta gas at elevated rpms (clogged filter / tank pickup / lines)

Just ideas!