High speed needle 0,045 inch IN from flush (= 1,1mm)
Low speed needle 0,045 inch OUT from flush (= 1,1mm)
Idle screw 0,03 inch IN from flush (= 0,76mm)

In my experience this is very close to optimal settings...it needs just minor adjustments from these settings. Most important is idle gap. It should be ~0,7mm. Then just go from there.

Settings also depend on plug. A GRP C5 or 6 plug likes it a bit leaner on top (cold natured plug) then for exapmple an O'donnell 97T (warmer nature).

thank u both for the help

Grp.28 tunned
 

Ok I found out why the motor what idle it feels like no pinch when I turn the flywheel, turns really easy with my finger, is there any other piston and sleeve I can use, before I bought this engine in dec.2o1o evolution sports in redlands,ca. Say I
can use.novarossi parts is this true

I couldnt get mine to hold a tune worth a damn today :( I ended up pulling it and running a Losi 350 instead :lol:

You can use the following piston and sleeve sets as the GRP sets are an unobtanium nowadays:

GRP MR Ninja B01 (the GRP tuned is based on this model)
TQ racing 501-T (based on the GRP tuned)
Ascendancy G5 (based on the GRP tuned)
Tecnopower B01 (based on the GRP tuned)

Edit: i see in another post your talking about the GRP .28? Those p/s sets are very hard to get (probably impossible) and i dont know if anything else will fit.

Just took a look at the engine and the exhaust seal had a large chunk taken out of it :eek: Needles were way off as well, not sure where that came from because I swear it was running perfect last time I had it out (though it has been about 10 months I guess).

thanks Ambros303 yea its my grp.28 tuned. i have been trying to find a piston and sleeve. i ran the truggy at 240 here in cali at one point it got to 270 and hurry got it cooled down and after that i dont have a good pinch anymore. motor was only 1month old and now its no good. i mailed renew (lance) he says he can repinch. but alot of people told me no and rossi has a part tha twill fit but i have been looking. and those tq and other are those for the .21 motors?

As Ambros303 said, the .28's are Notoriously Hard to find parts for. The companies that picked up the old design did .21's and didn't bother with the .28's so unless you find something on a Dusty shelf somewhere your more then likely SOL.

As far as I know, there are No Nova parts that are interchangeable.

grp 28
 

Send it to alan burton at the speed shop he can pinch it and make it run like new.

Yes, those are all .21 mills

http://i779.photobucket.com/albums/y...azl/piston.jpg

Best I can tell, a wrist clip was left off during the install leading to the failure (only one on the piston and there werent any pieces in the engine). Thing still ran pretty well :lol:

Any wrist clip recommendations?

Yes, INSTALL ONE next time. :lol:

:lol: I'm hoping it blew through the exhaust but I kind of doubt it. Had an extra piston/sleeve so it isnt to big of a deal.

this is my engine for 2011 a pickt up a brand new one. I guy had it sitting on a sell for 2 years. Iàm very happy with it. Also with a brand new ninja fls2053 pipeAttachment 710605

Sweet that is awesome!!! I have one also, got it new from a guy that bought it and never used it.

http://i281.photobucket.com/albums/k...x/DSCN0317.jpg


Got a brand new ninja 2053 on mine now also. The buggy has a brand new Ascendancy G5 which is as nice or better then the grp tuned.