the car idles fine and runs fine at half throttle but when i give it full throttle the engine bogs and almost stalls, is this to do with the low end mixture or the high end needle[>:]

It would be your high speed needle and it sounds like its to rich (to much fuel) just lean it out (screw the screw in clockwise) 1/8 of a turn at a time until the car runs properly. Hope this helps!

It does sound rich on the high speed, just slowely lean it out.

On the plus side, a too rich problem will not trash your engine like a too lean problem will.

I had the same problem and it was my HSN was to lean. Once I richened the HSN, it ran a lot better.

Matt

BE CAREFUL HERE. If the motor is cutting out, it can also be too lean. In this case, I would immediately return the needles to their stock locations and begin tuning again.

My motor NEVER cuts out because the HSN is too rich- it will have POOR performance but it won't cut out. However, my motor has cut out from being too lean on the HSN.

If my tune is in question, I just richen ALL needles and start over. It only takes a few mins when you get used to it.

But if the engine bogs down then isnt that as a result of too much fuel?

if it bogs out spiiting fuel out the exhast and sparying smoke.. then its rich... turn the high end in a little at a time.

give the engine time to adjust. before adjusting again as teh extra fuel has to burn out first.


if it sags and cuts with little to no smoke and fuel spitting then its lean. richen it out a full turn then start tungin back in. when you find the "peak" turn it out a click or two (always better to run a touch rich then lean).