New carb looks nice, though I'v never had a problem with the 2 needle... desisions desisions ;)

nice to see GO coming out with new things......but why a 3 needle carb?
ive never had a problem with the current one and 99.9% of companies tell you not to mess with the mid needle anyway. so i dont really see any benifit from it.

Good point. The 3 needle carby might be ok if you are a wizz at tuning, but a good way to confuse many of us: would hate to be a beginner trying to tune a GX11. with a 3 needle carby:confused: would put you of buying another one for sure. Why spoil a good thing, for a little extra power and economey: maybe they should offer it with a carby choice.:nod:

Nice to see everyone so positive about a new product :(

You don't have to fiddle with the mid range needle. It is set at the factory, you can just tune top and bottom as per usual - it's what the extra mid range needle (for want of a better word as it isn't really a needle) does within the carby that gives the extra performance etc. It offers up better fuel delivery to the motor through the range that a 2 needle carb can not.

I am sure if the performance benefits where not there, then they wouldn't go ahead and make it their standard carb.
I am also sure distributors could specify the original modified 2 needle carb on their orders if they wanted to.
Seems to me the order of the day is - don't fiddle. Simon from GO has said to leave the mid range needle setting at factory, and just let the carb do what it is supposed to do and tune the top and bottom as normal. Sounds pretty easy to me :), and don't try and tell me you don't want the oppourtunity for more performance and run time - come on :lol:. Lets all tune our motors fat and get 6 minute tanks because it's easy :weird:

Will try anything once!! If the mid range is set correctly at the factory, is the factory able to simulate every climate condition that every motor is going to be run at. don't think so, and if ones believes that climate factors(ie: temp and humidity) don't come in tuning factors, they live in a different world to the rest of us.:nod: Time will tell. What is wrong with 11 minute run time. If you are only getting 6 minute run times, you really don't understand tuning, honestly:rolleyes:

How come OS don't have any problem's with their 3 needle carbs then?

The mid range needle is a very fine tuning aid, which if it's set correct at the factory, doesn't even need to be adjusted if the operator only feel's comfortable tuning top/bottom needles.

You hit the nail on the head. "if it's set correctly at the facory", and human nature will adjust it for ya!!

+1

Everyone to their own I guess :cool:

We certainly have had no problem with the 2 needle carbs, which are very easy to tune - but if the new carb also tunes easy and gives better performance, you feel it can only be an improvement. Lets wait and see what it's like before condeming it totally without even running it.

I will be keeping a supply of the 2 needle version in stock just in case people prefer that option.
As shanef said, you don't hear too many people complaining about the tuning and performance of their OS Speeds etc. Probably one of, if not the best performing motor around (pity they are so expensive).
Guess we will just have to wait and see. Will be interesting to test and compare both carbs side by side in a week or two.

As previously mentioned I am sure it will be no problem for distrubutors to have all their motors supplied with the original 2 needle carb if that's what their customers dictate - just like we could order the existing 2 needle carb with the short LSN if required.
Come to think of it - lot's of people didn't like the long needle carbs because they couldn't tune them etc etc - now eveyone wants to keep them in favour of something different!! How the world turns eh :).

well i for one am looking forward to the extra tuning ability that a 3 needle carb brings!!!:D

.....but I do have a couple ?'s about the new carb...
1.) did they use a shorter bottom end needle to utilize the midrange tunning barrel (yes, i said it, barrel...not needle....lol) better, or leave it the same

2.) did they increase the inner diameter of the bottom throat? (the part that actually goes into the block itself) I know that using a carb with a bigger throat turned this motor from an "almost too smooth" motor with decent economy to a "bat out of hell" motor with excellent economy

Have a look at the pdf shane posted, the "3rd needle" isn't auctually a needle but a removable and adjustable fuel itake tube that sit below the hsn assembly and is what the lsn goes into.
For the performance improvements GO say come from this new carb it simply must be a better functioning unit.

Good point on the term "barrel" or "fuel tube" hustler and craig. I think the term needle is putting a lot of people off.

No details from GO on what has actually been done internally, but going on the part numbers and diagram it looks like an entire new main needle and needle seat. Also a new low speed needle to work in with the mid range set up. All the O rings are different sizes, so this would indicate new needle shapes and sizes as well perhaps ?

From my understanding the mid range barrel will effectively take over the job the long tapered LSN performed in the transition period from bottom end to top end performance.
The long LSN worked well, but required the HSN to be set fairly rich to avoid lean bog below half a tank. Also it has been noted that you had to be very careful not to go a smidge too far in on the LSN when leaning for performance or you would effectively block the fuel supply off to an unexceptable level causing problems (I gather due to the angle of taper on the long LSN).
These problems should now be solved with the introduction of the mid range barrel assembly, allowing you to run both the top end and bottom end a little leaner for increased performance without running into the problems mentioned above.
Seems to me the long tapered LSN was a trade off between the performance offered by the short needle LSN and a true 3 needle carb. It worked very well, but did have it's limitations.

This is not just an upgrade of the old 2 needle version, but a whole new carb that has been designed, developed and tested over the last 8 or so months.
The GXII was designed around a 3 needle carb, but the carb GO had for the GXII at it's time of release did not produce the performance results they expected from the new motor, so they scrapped it and released the motor with the improved version of the GX Series 2 needle carb. The plan always was to go back to the drawing board and design a new 3 needle carb that would unleash the motors true potential.

Bit of a revision on the 5RHO 3 needle pdf.
The GROR-0054 O rings have been replaced with the original OR-0023 O rings (# 35 on the diagram).
New pdf below.

ok, quick question. WHO is the US distrbutor now? Is Trey not still the distributor? Because emails wont go through to [email protected] anymore. They come back as undeliverable. sent from 3 different accounts. I need a price on some parts. Who else can I contact??

I stock most everything for GX/GXII engines

[email protected]

http://www.Nitro-North.com