ya i kinda figured that AMAIN would sh&t on GO like they did in the past (and with other brands)....to bad nobody else is stepping up and taking in the GO line...i'd love to throw a new rod in my gxII, get 'r pinched and let her eat some dirt again....ugh

I decided to get it from the horse's mouth. Amain PR Director says the GXII5RHO engines are in the warehouse now. Last time I asked about this it was another week before they appeared on the site, but this sounds positive.

GO Engines post on Amain forum (scroll to the bottom)

thats good new for all the US driver that run GO engines, your going to be impressed with the new 3 needle carb, more throttle response and power.

+1 That is great news. Good to see all you GO users getting a fair crack of the whip.

As Craig mentioned the new 3 needle is a sweet deal. Improved insert on the throat for a stronger and better seal in the crankcase, slightly different factory mid range needle setting, plus new anodised throttle body.

You will like the performance difference.

Important information on the new MkII 3 needle carbs now coming out on the GO GXII-5RHO's.
This will apply to all new motors purchased around the globe - including the new A-Main stocks.
The factory has made some changes and the needle settings are completley different from the older MkI 3 needle carbs.


With the new GXII-5RHO stocks when running in from new, set the needles as follows:

HSN 1.25 - 1.5 turns OUT from flush

LSN 1.5 turns OUT from flush


After 8 tanks or so you can have leaned the needles to:

HSN .5 of a turn OUT from flush

LSN 1 turn OUT from flush


At the completion of run in (average 12 - 15 tanks) you will need to lean both needles a little further.
Race tune will depend on what fuel, plug and pipe you are running, so final settings will need to be done by sight and sound.

Enjoy

How to tell if you have mkI or mkII??

The MkII carbs have only been released from the factory in the last couple of weeks, so if you have an existing 3 needle GO carb it will be the MkI version.

The other way to tell is by the throttle slide. If it is chrome coloured it is the original MkI version carb. If the slide is black anodised then it will be the newer MkII version.
You can also remove the carb from the motor and check the insulator around the throat.
The original MkI carbs had a black plastic type insulator, the newer MkII versions have a new improved white waxy coloured insulator.

Unless you brought your motor in the last 5 days or so - you will have the original MkI version.

Wayne, I have a rod or 2 left, send it on over.

Rex

Ok, thanks. Old it is :-)

They are up on Amain now. I don't see a separate 3needle carb yet but might be on the way.

Go Engine parts lot on E-bay
Also 2-MG66

got links to the auctions?

MG66's are used with a fresh pinch. Search EBay for Go engine and/or MG66.
I think most parts are from rc-willpower.

Correct

I bought my new gxII 5RHO from my shop last week. They have been backorder a week or so, so I thought it was the mkII carb on it. It wasn´t! Is the newer carb mkII much better than the "older" carb mkI?
So, what is the needle settings on this then, please?