jetting question

Hi All,

The bike is a 84 gpz750 It has a 4into1 and a kerker can and a stock airbox ..It wont start easy cold and has bogging issues I'm wondering if anybody knows jet sizes I should look at and if I do pods what the jetting should be then

Thanx, Silverhammer

Silver -- I too have an 84 GPZ, and can pretty much tell you that your carbs probably need gone through before you even attempt to rejet. Both symptoms indicate that.

Then it depends on the pods, which brand, the condition of your ignition system, and surprisingly enough, could depend on where you live. Alot of variables. Want an easy fix with everything there? Does Dynojet or somebody make a kit? Stage 3 is what you would want I believe.

Your still gonna be in for alot of test and tune time, I bet, if you are gonna do it right. What to start with? Let me find the link.

kzrider.com/component/option,com_joomlab...ew/id,60427/catid,3/

Post edited by: gpzrox, at: 2006/07/21 02:18

I would NOT use a Stage 3 kit. They are pretty lame at best and in this case would be far too rich on top.

My suggestion would be to try and ride the bike with the header and see how it runs. I suggest the pipe won't make all that much difference over the stock system in this case. My only concern would be if your Kerker had no baffle and might create a flat spot. If it does, you will have to shim your jet needles as I don't think they have clip positions. Use genuine Mikuni shims as these are cut more precisely than hardware store washers. Use two clips per jet needle, if needed. On top, see if you can pull redline through the rpm range. If you can't, you are a tad lean. The OEM main jets are a bit puny so go up to about #120s and retry the pull at the top, if needed.