sure is!!!! kick ass engine also, They also give fast shipping and customer service.

There contact address is in Pa.. Huh, I guess I'll have to
check them out.

Damn i would have ordered that. Too bad i already order an engine from maximo. Hes just modding a Go 5 port for me. Oh well. Im gonna get the efra 2072 pipe

Nope. The restrictor doesn't go all the way down to the throttle slide. It just restricts air flow into the carb throat. The idle gap stays the same. You may have to lean things a little (top and bottom) depending how much you change the restrictor size. Less air requires less fuel.
Set the WOT position on your EPA without the restrictor in, then fit the restrictor of your choice and tune accordingly.

Hey guys quick question.. will the WS7/II head fit on a Go? Thanks

Gene Hickerson win the PRO BUGGY Class on Florida RC PRO Series yesterday ... on a GO Engines 5 ports , way to go Gene !!!

anyone know where i can get a go efra 2072 for a good price?

thanks for the input,BTW how many shims should i leave if i fully broke in my engine?is it ok to run it without the head shims?

I run.3mm shim stack. One .2mm and one .1mm never run without shims!

Head shims depend on what % nitro fuel you are running and what heat plug etc.
The standard shims for the GX are 1 x alloy (.3mm) shim and 2 x brass (.1mm) shims, for a total of .5mm
Matt runs .3mm, I run .4mm, so everyone has their own combination of shims, fuel and plug that works for them.
If your new to nitro motors and tuning I would run the standard .5mm as comes from the factory, on 25% fuel with a med to hot plug. This will make your tuning a little easier to start with. With reduced shims, it can be a little harder to get a really nice tune and a steady idle unless your up with play in the tuning dept. Running standard shimming will make it easier for you to enjoy your motor, and give you more than enough power - trust me

Hey grizz,some where in here or maybe some where else there was an artical that talked about the engine machine gunning as mark called it. Do you have any idea of where the artical is or the cause of it?

I do vaugely remember that, but I can't recall were I saw it either.

A really lean bottom end will get the motor machine gunning, with that very fast stacato pulsing idle. You sometimes get it on the overun from a WOT burst if you are too lean also. Guess top end being lean could cause it too, but normally the bottom.
Get your motor idling nicely, then just keep going in on the bottom end needle and eventually you will get the idle raise up into the machine gunning situation. This is as opposed to the situation where the bottom is too rich (and a large idle gap), where you will get a high steady idle that drops down as the crankcase loads up with fuel. Way lean on the bottom will result in the very fast stacato idle - quite different.
Thatīs how I have found it to occur. If anyone can add to that or correct me on things, please feel free to contribute

I'm going along with Grizz1 on the low speed needle
being too lean. It sure is a wild sound to hear.
It's like your engine is having a heart attack from
lack of blood (fuel).

+1 grizz

Just wanted to get a feel for who is going to the Alabama Manufacturers' Shootout? Team Go Engine USA will be there. We will have parts and product on-hand, including GX-5R and GX-7R engines, pipes, starter boxes, seals, etc.

We will also have special RACE ONLY pricing for the GX-5R and GX-7R. Pricing will be promotional and for the race weekend only. Booth should be setup by mid-afternoon on friday.


Additionally, we will be announcing a new partial sponsorship program for aspiring racers.

Stay tuned!