Originally Posted by makaluch (Post 6398360)

Hey Guys,

I was wondering if there are any sites with good information on the Go Tech .25 engine. It's not a popular engine, especially among racers, but I would still be interested in a solid platform for club stuff on our loamy track.

A few questions:

• Where do I get parts (conrod) and do any 21 parts interchange?
• Does the 25 carb tune primarily with LSN?
• Best clutch setup (8ight-T 2.0) for loam and high grip mixed surfaces?

I've been reading through this thread and have learned quite a bit about these Go Tech engines. I'm ready to run it in and would just like to be as knowledgeable as possible. Back when I raced Kyosho MP 6-7.5s I was an RB and OS guy but I know that every engine has it's own unique characteristics ...especially Novarossi's...lol.

Any help or guidance on the 25 engine would be appreciated. I'm super-excited to be a Go Tech owner.

Mark M.

Originally Posted by Merciless (Post 6398280)

Hey guys please share any tuning details that are special to these motors.

I've been bussy running in a GX7R which I'm very impressed with. It's drank more than a gallon now and still has metal pinch, but it's easing now...

Top speed is impressive even with a 7mm venturi in and the bottom is pretty good to.

I read some where that using 2 X 1.1 springs in the clutch is the hot set-up and I'd have to agree now I've tried it.

All in all most happy with my GX motor

Rod

Originally Posted by grizz1 (Post 4978168)

Hi Rex, I shortened the LSN on my 7 Port as you suggested and wow!!! it was much easier to tune and ran hard. You quote 2.42" in your post but I think it should be 1.42" ?? The original long needle is 1.6". Going on your figures, I cut and ground mine down to 1.42" and it's sweet.

Out of interest I tried this same needle in my modified 5 Port, but it does not run as good. Has a little hesitation in the rev range just as the needle comes out of the spray bar that can't be tuned out. I am assuming the engine was modded around the long taper of the newer LSN needle and the sudden removal of the shorter needle from the spray bar makes it run a tad rich for an instant. Any thoughts on this. It's not a problem because I use the original long LSN in this motor and it kicks arse, but was just interested to hear your thoughts.

Originally Posted by prettyboy (Post 6399647)

I have a question ? Ive been reading on here about the lsn sizes that there is a short and long one. Does this also pertain to the GO .25 ? And if I have the long lsn in my .25 should I cut it down ? How long is the long lsn and what should be the size after cutting it ? Will this help with tuning on a GO .25 motor ? Thanks for the info guys...:sweat:

Originally Posted by grizz1 (Post 6399683)

Not sure about the .25 but I would think it would work just the same as the .21's.
Standard long needle is 1.6" long. Shorten it down to 1.42" and round off to a bull nose end, as opposed to the thin taper of the long needle.
Short needle will be easier to tune if you are used to tuning other engines like OS etc. I have run both, and IMO the long needle gives a smoother power band, and slightly better economy. Just a little tricky to get right until you get the hang of it.

Originally Posted by mattwoodcraft (Post 6400750)

alot of the new os range now use a long LSP needle it must be coming a popular choice with engine manafactor as i have compared lsp needles the os ones are alot thinner

Originally Posted by Tabushi (Post 6401071)

Hello guys,

Just small question, anyone tried to put turbo button head to .25 GO Engine ?, any info about it ?

thanks,