The promo kit comes with the 6, 7, and 8mm restrictors. Not sure what other brand ones fit. I use the 7mm restrictor and haven't had a need to try anything else.

ninja are identical to grp....

I replaced my p/s and rod on my ninja .28 with the grp, and perfect fit!!!

Has anyone ran the buku pipe with the GRP .21.

I need more cowbell!!

thanks for the quick answer....i have a heavy throttle finger and need milage...the 6mm should help me some, I just need more throttle/self control

Mine only came with an 8mm but it was when they first came out. It also came with the #6 plug and I hear the new ones are coming with a #5.

Novarossi restrictors will fit the GRP

Well i dont know what the hell to do about this thing, NO MATTER WHAT I DD the carb binds, i almost threw the thing in the bin today after hours of fiddling with it.

Engine is in an 8ight

Ive Tried:

Taking the carb apart checking for burs and rubbing the slide down with scotch brite and greasing it to hell - any heat and the slide binds.

Adjusting this thing every way possible, different length servo arms, different carb rotation positions and different ball linkage positions. No matter how good i get it when its cold - any heat and the slide binds.

Do i buy a new carb and risk the same shit all over again?

Or should i just buy a new kit with a conventional servo tray set-up, i know it wouldn't bind with a normal, straight set-up.

I don't if this is of any help but you could go on the Trinity forum and ask Adam Drake, he might have some tricks which might help. Could be worth a try.

It could be the fuel causing the carb to stick. If the carb is fine when cold, then binds when the motor is warm, chances are it is the fuel. Grab one of your buddies fuel bottle and empty your tank and replace the fuel. start the engine and the problem should go away. I've seen alot of sticky carbs due to bad fuel.

Does anyone have experience with a JP1 and 2053 pipe on the tuned GRP 21? I'm looking for a strong bottom end. I tried the JP3 and JP1 and I like the JP1 so far. I would like to know if the 2053 pipe would have a stronger bottom end than the JP1.

hi, anyone tried out the GRP .21 tuned off-road buggy engines ? ...

it's price is very attractive , includes tuned pipe, engine and free gifts at quite an amazing price compared to other top engines... at the moment.

think Truhe, Battle are using GRP engines as well and have a very strong showing at the Worlds.

thanks

No none of us have! Where did you find out about these engines?!!1 J/K

Look back through this thread and you will find all that you want to know.

I have had 2 Losi 8ights and was very satisfied with the buggy. The Kingheads Radio tray stiffner solved most all of the problems with the Throttle servo's.

Previously I had the XB8, XB8EC, Jammin, MBX5, Turmoil, RC8, and the previously mentioned Losi's. The Losi's Were great until I tried the 808, Hands down the best buggy I have ever drove!! You can drive it hard or soft if you like and the parts dont wear like the Losi.

GRP, for what its worth, If you use a Go or Novarossi standard head button on them, most of the tuning issues go away. You just need to reset/reshim your deck height.

tuning issues go away if you just switch over to a os p3 plug, the grp plugs are tempermental, once they get working good they last a long time, but i found the os plug just works better, makes it much easier to tune and to get the engine to idle

Personally, I have not had many tuning issues with my GRP .21 . It has an awsome engine. Mine is going on its 3-4th gallon? and still runs great. I did, however, switch from the GRP #6 (TOO COLD) to the GRP #4, which smoothed out the idle, got rid of the occasional flame out (after refueling). I am now running the OS p-4 plug, and seems to work great. It runs all day @ 180-190 degrees, with tons of power. As far as holding a tune, I find that it normally only needs a tiny tweak of the LSN (within 1-2 hrs) depending on track, but normally is fine.
I have read of some having tuning issues, but I have not experienced any of that, with the exception of the ones I mention. Maybe I have been lucky.
I come from running the Novarossi's (which I still like), but have been SUPER happy with the GRP, so I see another in my future.
Oh yeah, and I run the Jammin JP-3 on it, which it seems to love. On race day, I have gone 8 1/5 minutes with fuel to spare.
Just my experience, anyways.