Jetting question.

My 74 Z1 seems to not want to pull hard in the upper RPM's kinda lags to get to redline. It has K+N filters and a 4-1 exhaust and right now has main jets of 122.5 which I believe are 10 over the stock ones. I know it has stock pilots as well.
I am at relitivly low altitude and wondering if that is enough of a jet for the setup? I have read where others are using like a 140?
Suggestions?
Thanks.

Anyone? What are others running wtih this setup? WiredGeorge?

mmm had the same when I swoped a big diameter exhaustpipe 4 in 1 for a small diameter 4 in 1. It pulled hard up to 10.000rpm. With the small pipes it stops at 7500 and struggels to get 9000rpm... might be your problem...

I would try 135s.Had a 1975 900 with k+ns
and a racer-one pipe,in Mi.Went to 29s and
still ran the 135s.Stock pilots.

Thanks for the help guys. I might try running some bigger ones and see how it goes. I recently upgraded the whole ignition system so it could be now that is needs more fuel to keep up with the stronger spark.
Do you think 135 will be good with the V+H pipe?

I had 117.5s in the 28s on the last Z1 motor i had and it ran great well past red line.also ran V&H pipe and dyna coils and ignition.with georges coil mods.

76 LTD wrote:

I had 117.5s in the 28s on the last Z1 motor i had and it ran great well past red line.also ran V&H pipe and dyna coils and ignition.with georges coil mods.

What altitude were you at? Did you have pod filters?
Thanks.

Post edited by: bLodi, at: 2007/07/13 08:37