i agree with you grizz the gx series 5 port matched with a 2072 in a truggy is an awsome combo i know i loved mine befor my disaster hit anyway im running my mg66 in on wednesday avo when i get home then im straight into racing thursday afternoon with the state titles being ran my mg66 is going in my mbx6 buggy

grizz all the best for the nationals mate

Sweet Try and get 10 tanks through the MG66 with the foiled head, and it should be loose enough to perform pretty good. I reckon mine has taken just on 4 litres to come right up to speed. It's pretty well as lean as I can go on the top without getting lean bog now (pretty well right on 1/4 turn in from flush), and it's haulin butt

Hi Giz - just a query on the alloy shim you took out ? The break in shim comes in the box with the motor (a .3mm or .2mm brass shim - can't remember which). It is not fitted at the factory to my knowledge. The .3mm alloy shim and the 2 x thin .1mm brass shims should stay in the motor.
If you took the alloy out, you will only have .5mm total shim including head button - might be a little much compression running 25% ?

I have a 5 port that I need to replace the o ring in the crankcase at the bottom of the carb. Where can I get one or can I use another brand that may be more readily available?

Rex - 22Racer might have one. If not the new US GO distributor will have parts soon.

What's the part number?

If somebody is interest, i've my GO GX-5R for sale, only 5 tank of break-in.
I had a deal on a MOD JPX21, and i want to try it, and i ever have a JPX28 in my truggy, so i'am stay in the JPX line.
Engine is completly sealed with Threebond 1211

I think it's 0004 part #, I don't have one though. I just use a sealer if it's in tough shape until I get new ones.

Rex

spoke to mark about it..runs sweet without it and upped the tank times even though I had to richen just a touch to keep temps reasonable.Adds a little more torque and with temps around 120ºC and runtimes at almost 13 minutes I'm happy with it.The shim in the box is a .2 copper I think.nevr added that..no need to with the new lower initial pinch.

hi Gizmatron im puting in my ceramic berings now on my 66 can i leve the alloy shim out and not do any harm and dose it run beter
cherrs jason

Does anyone have any experience with either a JP4 or 2013 on a 7 port?

i have used a jp4 on the 7 port provides excallent power and you will still get reasonable fuel economy , in the buggy i was getting close to 10 mins with this pipe , cant coment on the other pipe but

ok thanks for the input. 10 minutes is plenty of runtime at my track.

Part # is OR-004

Hey Giz, that's cool mate. I just didn't want to see you do any damage to the the beast. If "Guru Massive" has OK'd it, then go hard. Hmmm, I might try it myself. Are you using a medium plug with this set up ?

on my other GO engines i run .5 total with 25% nitro and a medium plug , when i have finished running in my Mg 66 i was going to do run the same .2 of shims