Originally Posted by
John Schafer
I broke-in and raced 2 new GRPs last weekend. A tuned .28 and a Powerhouse .21 . On the .21 I ran a JP-1 (powerhouse recommended) a 6mm restrictor and, a MC-9 plug. On the tuned .28 I ran a MSR 1005 with a 6mm restrictor and, a O.S. P-3 plug. Both engines ran, tuned and idled flawlessly on Sidewinder 30%/12%. Both engines also ran in the 230 degree range. I was not overly impressed in the power department, but then again they don't have much fuel through them and they had 6mm restrictors. Also both engines, buggy and truggy were getting about 8.5 minuted per tank. I think the pipe choice and the engines still being tight had a little effect on the runtime and also running temps.
I will be trying different pipes next time, which may be several months before I get the chance to race again. Someone said a few posts earlier that these engines were "cold blooded". I disagree. Compared to my Werks engines the GRP's are great...
do yourself a favor ...get some colder o.s. plugs and take the needles back to the stock settings ....
hsn=3.5 turns out from bottom
lsn= 6.25 turns out from bottom
idle gap is about 1.25 mm
heat the motor up with a heat gun ....try and crank it ...if it doesnt crank lean the lsn only up a small hour turn ....try again ....if it doesnt crank repeat until it does ....also how did you break it in ....how many tanks did you idle through it ? did you heat cycle it ? did you just blip it around at running temp of no more than 200 degrees? did you wrap the head in aluminum foil? if you didnt you may not have a great impression of the motor ....if you break it in this way you should get many gallons out of it ...i dont just say this because i think it ....i have had a team losi driver (alan burton) teach me how the engine should be broken in and tuned ....they will run at temps above 220 and beyond ...but as jyzf said ...it aint gonna run for long
just my .02 and i have either broken in or helped break in 3 of these motors in the past month ....hope it works for ya ..they are super sweet motors ..they just tune different than say like o.s. motors ....