BS34 1985 GPz 750 Mildly ported Need Jetting Ideas

Hello! First post here for me, so here goes. I have a 1985 GPz/ZX750 A3 that came with a set of BS34's. Top end of the engine has been torn down, inspected, honed, new OEM rings, stock pistons. Thsi is where it gets crafty: The head has been ported for street use, combustion chambers blended and semi-mirror finished, .006 removed from head surface. Stock valves, stock GPz cams. I destroyed the original airbox, but have another one in the mail. I need reccomendations on jetting for these carburetors. I do not want to fire this thing up and wash my cylinders down, and I do not want to burn it down from being too lean. Current jetting is 110/37.5.

My biggest concern is break-in. Am I safe to break in the engine with current jetting?

Thats the same jetting I run on my 82 GPZ750 that has ported heads on it from the factory & an old 4-1 RC header on it & 16,000 miles. Whether the later ones have the same heads I dont know but I do know they {later ones} have slightly hotter cams in it. It may not be spot on but I sure wouldnt worry about it breaking it in with that jetting. maybe uncover the mixture screws abd back them out a half turn is all. My opinion only, others may vary

Thanks! I have uncovered the mixture screws, I will work with them and break it in, then see what the plugs have to tell. Just a heads up to anyone ordering from Dynoman.........Vesrah gasket kits are being ordered on a demand basis, they had to order mine from the factory. Not a big deal as i have more time to clean and prepare, just mildly frustrating!

im running 118 mains and 37.5 pilots with a 4in1 kerker with stock air box

Thanks! I am also running the Kerker 4 into 1. Did you work your way up to the 118's from 110's?

no they were there when i bought the bike. it has a stage1 dynojet kit in them and thats is what they say to use with a after market pipe with a stock air box. i havent had any problems with the jet size.

I'll give the 118's a try once I'm confident the cylinders are sealed. Unfortunately I will not know how well my build is until tomorrow when I assemble the top end. Apparently my 24 hr shift is more important than the bike to my employer (US Army).

PS: That is a CLEAN bike you have! I like!

thanks, i just had my carbs rebuilt a few weeks ago and they have been working great. they worked great when i bought my bike but i started to have some problems a few months ago. the old owner had put the wrong type of pilot jets in the carbs so when i had them rebuilt the builder rick replaced them for the correct ones.

www.jockeyjournal.com/forum/showthread.php?t=64769 Once again Ill post this. A 118 Dynojet jet = a Mikuni 110.6. In other words you both have the same jetting. All you need is the adjustable needle and mine runs just fine with the factory needle in it

Thanks MtKaw! Interesting info.....did not know that.

same here, i didnt know that neither