mmmm, low end is fine, its a little on the rich side actually.
It isnt a lean bog or a rich bog, it just non responsive when I hit the throttle

hmmm... you might want to try a heavier spring on one or two of the clutch shoes. That'll let it slip more.

:eek: You only got it yesterday and have ¨broken it in¨ already, and are now doing WOT passes down the back straight ?? How many tanks has it had through it ? My guess is it is still real tight, and is struggling to perform because of this. Maybe you ran it in on a bench, I don't know, but still seems a little early to be giving it the berries and expecting 1+ gallon performance.
I would richen a bit top and bottom and take it easy for a few more tanks. Just my opinion.

just finished off a gallon

Also, its running at 190ish I dont think I want to lean it out anymore to bring the temp up.
Would taking off the copper head shim bring the temp up a little bit?

Lean that low-end neddle screw some more.
That 7port should be rippin the tires off when
you peg the trigger from idle. Granted you have
the idle air gap set properly.

Whew - you work fast man!! If it´s got a gallon on it then go hard :nod:
Like rage says, tweak it up. The 7 is a powerhouse.

With only a gallon on it I would think it should still be running slightly hot because there's still some excess pinch. Yes, variables make it impossible to tell you what the right temp is BUT........my 5 port is fully broken in, I'm running 20%Byrons with .4mm shim stack in a MBX6T, My temps are between 230 - 260F when race tuned.
Lean that puppy out.

Hello!

What shimming would you suggest on the GX7r when running 30% and when running 25%. A friend of mine needs some help so i'd hope you guys could lend a hand.

/M

190 degrees Fahrenheit is not hot enough, and it's definitely not broken in. You should be running at least 220-230 towards the end of the break in period. lean it out just a TAD, and you'll notice a huge difference. Also, if you're not preheating your engine, please keep an eye on the lower part of your conrod. cooler running temps, new motor, and starting cold may accelerate the wear on the lower end.

Shims. Take out the copper one and run two aluminum ones. This goes for all three GX engines.

Just out of interest what clutch springs are you running.....I had endless problems tuning my first 7 port.went round and round in circles with the fuel/needle settings trying to get rid of exactly what you describe..brake for a corner or a slower part of the track and then open it up wide and it would just hesitate like a lean bog then scream once the revs built up a bit..eventually I swopped the 1.0 clutch springs for 1.1 springs and the engine was transformed. The same guys I was leaving mid straight but being caught by as I exited every corner I was lapping easily and they couldn't even touch me for acceleration or top speed. Before you lean out a pretty new engine too much I would check your springs and don't forget if they are 1.1mm but really old they lose their spring after a bit and engage earlier so fit NEW ones.

Awesome thanks for the heads up.
I THINK they are 1.0. Its the black associated ones for the RC8. I ordered a few pairs of shoes and springs. Ill try em out and report back.

I leaned out the bottom a bit and its performing a little better now, with the temp hovering around 210-220

+1 on what Gizzmatron said. We have found (depending on track conditions) that the 7 Ports like 3 x 1.1 springs or 2 x 1.1 and 1 x 1.0 at the weakest. This motor doesn´t like an early clutch at all.
Have been using the Ascenency (JVD) 4 shoe clutch with 1.0 springs on my 7 Port which works very well, but the springs in these clutches are a bit stiffer than your normal 3 shoe variety.

Just got back from the track, I am 100% sure its the clutch.
Race tuned @ 230F and its still bogging.
As soon as I let off the throttle and try to get back on it, it lean bogs like its starving of fuel.

PS
This engine freaking rips, I was keeping up with a guy running a vspec and doing laps around another guy with a LRP .28 :lol:
The top end is insane and it holds a tune incredibly well.

Yeah baby :nod: