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thats good to hear its going good, I ran the GX7R for a couple of seasons, fantastic motor, fast and very reliable.

could anyone tell me anything about this motor...

21/abc/rear exhaust silver buggy engine crank 14mm 5p+2

is it a good motor for a nitro newbie... and also would do ok in a truggy...

new or second hand ?, if new it's a good choice for truggy with lots of bottom end power & enough top end to keep the smile on your dial.
they don't make the rod for them anymore so if you need to replace the rod in the future u will need to buy the new crankshaft as well, as the newer cranks have a larger pin for the rod. HTH

great avatar u have as well

That was a myth, they never changed the rod bushing size. (Even Simon agreed) If they did like 10 other brand rods would work anyway.

Rex

hi, a friend of mine has one of the older 3 ports, before the GX series, will the gx series p/s/r fit in the older 3 port? if so i am assuming he will need the crank also? after all said and done he may be better off just updating the hole engine to a new one?

All the Go .21's internals have alway's been interchangeable. I am not positive on the GxII though but I would think that would be the same also. If the crank is in spec it would be fine to use with a new Gx p/s/r. I would assume it probably has some wear though and it would be cheaper to buy a new engine. I am waiting on a shipment of Go based 5 port engines that will sell for $125.00. They have the new 3 needle carb, I have ran a Arrow with that carb and it is very nice.

Rex

yes it is new in the box. never broken in.. the guy i buying it from,, bought it and never put on his truggy. and has had it for a while.. now he is getting out of the hobby.

thanks for the infomation..

and thanks on the avatar...

im new to nitro,, ive been running electric for a while and just got a losi 8 t 2.0,, it has the losi 454 on it but the gas mileage is not there... im only getting about 6 min out of a tank.. and in a 20min main... im in the pit a lot...

what about tuning.. will it hold a tune pretty good???

Hey Bandit, if its the model before the GXI series (gold heads) it will be fine for a truggy, the 5 ports older than that had a few carb problems but the last of the silver head 5 ports had the alloy/composite carb.

Check the carb orings are ok before you run it, if they are the brown ones replace them with the black ones.

What you should do is measure the crank pin of a gen 5 and then a gen 5.5 or above and see for your self the gen 5 crank pin was 4.97 mm the new crank pin is 4.99. there no disputing an acurate digital measuring device.

The rtr go engine still have the 4.97 crank pin.

Hope this helps

Naa

The new GX II PRS set will not work with older models. The cranc cases are different and so is the sleeve.

If you are looking for a new engine or parts we have them as well for older models.

http://www.ebay.com.au/sch/nitroaddi...&_trksid=p3686

I checked the o-ring and it is brown. where do i get a black one

Are you in the US?

YES im in the US. mississippi.. Do you know where i can get this o-ring and what is it for.. is it to stop and air leak.