I have a Novarossi Rex R21b engine in my Hyper 7 PCR RTR, and i dont know what the break-in setting should be for the LSN. I set the MSn and the HSN, just like i always do (high speed needle 2.5 turns out, MSN very slightly in from flush with carb) but the LSn is the one im having the problems with. The way i set the LSN on my other engine was 2 turns out form flush, but with this carb once it wont go past the flush mark. I keep on screwing and it doesnt do anything, so i obviously need to set this differently. what should i set it to??

Most engines have different carb settings NEVER mess with them before you run the engine. Leave the needles where they were when you took it out of the box and then adjust them as you need to during break in.

Edit: Stock needle settings are always set rich so you don't hurt the engine and make sure you keep it rich (not stalling out rich just make sure it holds an idle and you can run it around at a low RPM without it stalling). If the engine temp wont come up to atleast 200F then wrap the head with something untill it does and keep the engine temp between 200F and 230F.

I know how to break in an engine, and since ive already turned the L:Sn settings, because i tried like 50 times to get the engine started and it wouldnt. So i messed with the needle settings. I know people know what the setting should be, when i asked about my old Hyper .21 8-port like a million people on thsi site told me what the break-in settings are so there should be people who know the settings for this engine.

Just contact novarossi.
email: [email protected]


Rippin it up!!

I E-mailed them, are they good at answereing questions, and E-mailing them back quickly?

lol its novarossi im sure they are good at answereing questions ,depending on how good you are at understanding what they say ,and as for quicly emailing you back well maybe not in like 5 minutes but im sure you will get the answear within 24hr lol i remember being a noobie like you and being inpatient brings back memories lol and actually i think i even called them .so email them and find out how long it takes

Sorry I assumed you didn't even try to run the engine. Some kid did that at our local track with a mac .21 and just screwed that motor up badly... I still don't understand how he screws up his engines the way he does because they run... its just impossible to tune them no matter what you do.

Remember if it was set to rich from the start its going to take a bit for that fuel to get cleared out so just keep it running as long as you can and tweak the needles as you go untill its running smooth. Hopefully you get your information from novarossi soon.

Ill tell you guys once i get an E-mail back from them

They still havent answrered back.

Try this one. I got a reply from them from this email address.

[email protected]


Rippin it up!!

Thanks i just sent him an E-mail also.

Novarossi should get back to you soon. They replied to me within 24.



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Still havent gotten an E-mail back, are u sure thats the right adress?

Yes, I'm sure. Both of those are right. Besides if they weren't they would have came back to you. I sent an email to them on February 21st and they sent me an email back the same day. Have patience sherlock.

I still dont get why doesnt anyone know this?? There are other people on this siote who have this engine, how do they not know?? either that or they just arent responding to this thread??

Is the rex similar to the N21BF? If so I can turn my lsn in and count how many times and give you these specs as mine is still new in box.


Rippin it up!!

OMG Thats soo funny and kind of stupid that yyou never said you had that , but its OK.



Its the EXACT same engine, just mine has a Rex sticker on the carb!! And just so you know itrs the needle on the part of the carb that actually slides

Okay, turn the screw all the way clockwise until you bottom out and then back out 3 full turns.





Rippin it up!!

Thabnk you alot

Oh yeah, if your motor still has the flat head screw driver screws for the backplate and the head I highly recommend getting a screw kit from www.tonysscrews.com. I got the one for the P5 for my N21BF and it worked out awesome. Less chance of stripping the screws.



Rippin it up!!

I set the carb. the only time im gonna have this week to break-in the engine is probably on sunday, ill say how it goes, from what i heard this engine should be FAST

After you back it out 3 full turns just back it out 1/16th of a turn extra. Mine was 3 full turns and 1/16th.


Rippin it up!!