the pinch will go away after about a gallon or a little less, just be cool with it and you will really feel what she can do when it loses it's pinch.

Yea I will be racing it saturday, as long as I leave it tuned where it is it should be fine. I was running 205-215 after 3 laps and a warmup. I usually like to run in the 250 range.

your in the ball park, your runtime will be a bit low, use a 7mm insert to help, and when the pinch breaks the 250 260 mark is where i run mine and they are very nice, have fun

i need help deciding what to run i am interested in the 3 port race for my buggy but we have very long straights so i think the 7 port would be a better choice. either way im getting the 3 port race for indoors but i need a engine soon so what do you think?

I just recently put a 7 port in my buggy and have been very happy, its very smooth when ran with a 053 pipe. I do however like a full alum shoe setup to give it alittle more snap.

I've been having issues tuning my 3 Port Sport (Aluminum carb).
At my first race 2 weeks ago I had issues trying to get it to idle and run consistant. I had 2 stalls during my heats ( once when the car was being marshalled and once while the car was flipping in a crash). The glowplug blew and that ended my main with 3 laps to go.

After the race I went through ad sealed the backplate, carb, needles, and checked the fuel tank and lines.

During an afternoon I tried almost every setting recomended on this thread and here's where i'm at...

With this motor/carb, I can not run the HSN flush or near flush, it simply will not run well ( I tried every combination of LSN to accompany this setting, it was a no go).

So finally I ended up with the HSN in about 3 turns and LSN in about 3 turns from flush. My idle gap is now .9mm, it is running well on the bottom and top, but the idle is a bit crazy. Believe me I tried every combination of HSN/LSN/gap that afternoon running about 3/4 gallon of fuel.

Seems that the LSN has 1/4 turn widow between too lean and too rich...?
Does this sound right?

My carb slide returns to the stop everytime, but sometimes it does seem tilt or cock in the carb alittle bit. I could be beating myself up over carb problems...

I just bought the 3prt R Spec and I don't have time to break it in before the weekend. I was thinking about using that carb on the 3 sport? I also have an AE carb from the .28 Pro, but I have no restrictors for that carb and don't know what fuel milage i'll get.
Any thoughts on using either of these carbs on the sport?

Thanks guys

The carb on my Go 3 sport seemed to be kind of shoddy. It wouldn't idle consistently and I had issues with fuel load. I swapped it out for a V-spec carb and problems solved. I would recommend trying the R spec carb out.

Well, I have to say I am really liking the 3 port R. I got to run it for the second time yesterday after break in and things are looking really good.
I was a little frustrated the first run after break in as I was experiencing a severe lean bog that I just couldn't tune out - turns out I was having some fuel tank issues with the RC8. So, I threw a mugen tank on and hit the track again.
I basically had to start over from a tuning standpoint - the Go's definitely tune a bit different, a fat top end (around flush) and a leaner bottom seems to do the trick. After figuring this out I was really enjoying this motor. Really smooth power from top to bottom - very driveable (is that a word?). By the end of the day I was running right at 220 and got a 9:23 run time, very respectable I think. (it was a pretty small track, so I expect a little less on a larger more WOT track).
I'm using an 086 and am still running the extra shim for break in as I haven't hit a gallon quite yet and the engine still has lots of pinch. I'm headed to a larger track on Sat. so I should be able to open it up a bit more.
Great info on this thread for these engines!

I gotta say all the carb problems I am hearing about matches up exactally with the issues I was having with my 5 port. I purchased the 21H carb off of the OS SPEED and wow not a tuning issue since! This particular carb has a midrange adjustment which I'm am curently experimenting with; I would really like to lean the midrange out a bit but that becomes very involved it's not as simple as turning in the midrange seat. I don't want to get off topic with midrange tuning but if anyone has any experience with a three needle carb I would like to hear about it.


Eric
713-392-7480

On the O.S. carbs you really shouldnt need to adjust the midrange passed the stock setting. Stock is perfectly flush with the body then one for 360 degree turn it. It should be set between the 2 and four o clock as if you were looking at a clock face. Tuning the mid varries directly with the low I.E. if you turn the mid in an hour you have to do the opposite or close to with the LSN setting. In short, unless you are much better at tuning engines than me I wouldnt mess with it unless you're experiencing problems between low and high.

has anyone tested the the .21 3port race motor with a os 2050-2060 pipe yet just courious about if these are like the v-spec then that pipe should be close right ? thnx will g

I ran the OS 2050 on mine for a few weeks and it was very good... I put the GO 2047 on and it instantly had more power. If anything the OS piple may have been a tad more smooth but not by much. If you have the OS pipe, i say run it because it was awesome, i had no complaints while running it. Just found a lil hidden power when i switched.

Going to try the new GO pipe this weekend and I will let you guys know. I plan to run the updated GO 3 port + the new pipe.

Im also thinking of running my current 3R in my truggy and seeing how that goes.

Yea I will be picking up a set of the inserts tommorow at the race. As long as I can keep my buggy on its wheels I should do pretty well .

t mizz thnx for info i dont have that pipe was just thinking of if i was able to get one all i have is dyn 053 and skyline 21 pipe im looking for another i would like go pipe but they little pricey for me right now im still alittle low budget thnx will g

What experiences have you guys had with a THS 816 pipe on the 5-ports. This is the pipe Rick Break of RB Mods swears by and I have been running it the past couple races but I'm just not seeing the magic. I'm putting the 086 back on this weekend so I will have a direct comparison.
Thanks!