I had to turn carb a little to get slide ball link to not hit center diff mount and my servo don't pull throttle link straight at full throttle it's at a little angle. I am afraid it will damage slide barrel over time is this something I need to worry about or should it be alright seems to bind very little at WOT. I have tried different angles and spinning ball link on carb and still pulls straight until WOT then get it's at a angle due to servo rotation. Thanks for any fixes or help!

nitrotec is pretty much a race version of a nova 3 port , it has much better more durable parts , better carb , front bearing and crank intake timings as well as a team piston , too bad they are discontinued

trying to bring them in as a fusion X3 "race" or something along those lines , we shall see

the best way i have seen it done on losi and how i set all the customers carbs who have losi cars is to rotate carb clockwise about oh 5° or so with linkage ball pointing directlydown towards pinch bolt , linkage on arm on the bottom outer hole i believe


hope this helps

Thanks!

I really like the way this motor is turning out after 1 gallon it holds tune and runs 10 min on one tank also idles forever but I can't seem to smooth idle out all the way has a little pulse. Like I said I can deal with that I think it needs sealing around carb neck and pinch bolt. Anyway I am trying to figure out when is the right time to pull shim like it says in manual or just keep on running it? I don't understand why this motor didn't sell better it runs as good or better than any of the Werks standard B5/B6 motors and lasts longer for sure I got mine for $200 with coupon great deal! When are other owners removing the small shim from head on their R21? Thanks AGAIN!

If its the new version,I wouldn't remove the shim.It already comes with the correct shims installed.The first versions had 1 too many shims.I can't figure out why people don't run this engine I too have had good luck with it and pit at 10 min easily.

I guess I got older version because my manual says to remove small shim after it's completely broke-in. I will probably wait until 2 gallon mark to remove though so it's all the way broke-in. I noticed head has flat head screws like the back plate how hard is it loosen? I need to get a really good screwdriver so I don't strip screws I guess. Thanks again for help/info xxxntwv and anymore tips for R21 would be great!

If your happy with the performance I'd just leave the shim in there.Removing it will give it a little more bottom end but may decrease fuel economy a little.The head screws can be a little on the tight side.Just make sure the screwdiver fits good.

I have a race this weekend but I have a stripped hole on the motor mount base it's a Losi quick change mount. Is there a way I can rig it up until next week when my new Kings Head mount comes in or should I be OK with 3 screws in top block to base? I do have 4 in crankcase to top block . Thanks AGAIN!

I cant say for sure if it will be ok or not.You may be able to find a metric screw just a little bigger and screw it in the hole.

Yeah after I posted question I went thru my misc. screws and found I one that would tighten. Thanks for your help Again! Oh yeah does your front bearing leak a little?

Yea man, it's a dialed mill. Much better then that werks stuff.

Was just wondering if the piston and liner for one of these go into a novarossi plus4 or toro nero block???????? if so would i have to chamge the shimming or not???????

Nitrotec or p5xlt? Which one makes more power?


I like my p5's but I would like a little more power and runtime. My p5xlt has over 10 gallons so its probably tired but it still holds a tune and never flames out.

No , a plus 4 sleeve is different than all other novarossi engines, the pistons are the same diameter,sleeves the same bore but the o.d. Of the sleeve is smaller

Lmk if you need anything Rene