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06-06-2013 | 11:57 PM

#5656

Speedracer1600

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Hey guys is there any particular trick to tunning with a 6mm insert? I am running an old 367 with a 9886/41021 and a 6mm carb, got 12 minutes out of the tank but I am having problems with high idle and 4 stroking.

06-07-2013 | 04:18 AM

#5657

scrapsz

Tech Master

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Posts: 1,845

From: Irwin, PA

Quote:

Originally Posted by NZReilly

Hi there I have a bonito 7xl with ceramic rear bearing and have ordered the new keep off 7xl with ceramic rear bearing and was woundering what the difference is between the Two and what pipe people are using to have a smooth power band

The diff btwn the two is the main bearing and the crankcase (area around main bearing)...other than that the engines are the same. I don't have the KO 7xl but I do have a Bonito XLB and the smoothest combo I found was the 2084SS/41021.

06-07-2013 | 04:23 AM

#5658

scrapsz

Tech Master

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From: Irwin, PA

Quote:

Originally Posted by Speedracer1600

No trick. The rule of thumb is the smaller the insert the more narrow a tuning window. When I've seen the symptom you mention its been too large an air gap with too rich LSN. Check the air gap (0.6mm) and re-tune the LSN especially if the 4 stroking is at idle.

06-07-2013 | 05:45 AM

#5659

afr0sch

Tech Master

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Posts: 1,259

From: Dallas, Tx

Silicone filled crank

Hey Nova guys, here is a link to my ad for a 15009T Silicone filled crank - NEW!

Just thought I'd share. Nice upgrade or spare.

http://www.rctech.net/forum/r-c-item...ne-filled.html

06-07-2013 | 05:53 AM

#5660

Eivind E

Tech Master

Joined: Jan 2010

Posts: 1,628

Who can tell me how to decipher the codes etched into the Nova crankshafts?
Asking because I have a couple of cranks and do not think they were the right ones that belonged to those engines.

06-07-2013 | 06:22 AM

#5661

Matthew Bailey

Tech Fanatic

Joined: Mar 2002

Posts: 839

From: Watertown, NY

Quote:

Originally Posted by Maximo

Yes ! it gives the engine more snap, and more top end.........for anyone with a Plus4 or BTT looking for more power should look into the 41001 as well as the 9886........ The difference from a 2096/41021 to a 9886/41001 is like night and day, almost makes it a totally different engine....It is a shame how many people have never seen this engines true potential as they have never run anything but the pipes that neuter the performance.....

+1

and the 9886/41001 give more run time than the 9901/41021 combo.

06-07-2013 | 06:36 AM

#5662

yollie

Tech Adept

Joined: Jun 2012

Posts: 116

what can i expect from torn carburetor boot???
thanks in advance

06-07-2013 | 06:49 AM

#5663

Hoese37

Tech Elite

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Posts: 3,819

From: Hutchinson, MN

Quote:

Originally Posted by yollie

what can i expect from torn carburetor boot???
thanks in advance

Expect it to lean bog. Fix it immediatly.

06-07-2013 | 06:54 AM

#5664

Maximo

Tech Champion

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Posts: 7,901

Quote:

Originally Posted by yollie

what can i expect from torn carburetor boot???
thanks in advance

it will run fine...but can ingest dirt thru the tear........ oh...if the slide is very worn the engine may also start to run very erratic....so definitely replace the boot sooner then later....

06-07-2013 | 07:29 AM

#5665

Eivind E

Tech Master

Joined: Jan 2010

Posts: 1,628

It will definately breathe through the boot. If you put the rubber cap on the intake of a carb, and the one on the fuel inlet, and you rotate the crank so the piston goes up and down, you will see the carb slide move in and out as the engine tries to inhale, so absolutely if you got a hole in the boot it will affect your tune negatively.

06-07-2013 | 08:20 AM

#5666

PERROTTO

Tech Fanatic

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Posts: 785

From: Omaha, NE

Quote:

Originally Posted by Eivind E

x100. even the tiniest pin hole will throw off the tune and lead to flameouts. This is one of the reasons my carbs get pressure tested under water regularly.

06-07-2013 | 08:54 AM

#5667

yollie

Tech Adept

Joined: Jun 2012

Posts: 116

thanks for the very2 quick answer. i think that's why my 4btt can't run like she used to. i didn't notice it until i have a complete carb tear down, wich i rarely do.

06-07-2013 | 08:59 AM

#5668

t0p_sh0tta

Tech Elite

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Posts: 4,863

From: Connecticut

What tools do you guys use for measuring idle gap? Piano wire?

06-07-2013 | 04:43 PM

#5669

aussies1129

Tech Elite

iTrader: (74)

Joined: Jun 2007

Posts: 3,485

From: LAND DOWN UNDER

Quote:

Originally Posted by t0p_sh0tta

What tools do you guys use for measuring idle gap? Piano wire?

small cable tie just put some calipers on it to check
as for a torn carb boot my symptons were rich as more air more fuel? you can also put a small cable tie on your boot to stop any movement
cheers

06-07-2013 | 06:59 PM

#5670

lpmold

Tech Initiate

iTrader: (1)

Joined: Nov 2008

Posts: 44

From: Apple Valley, Ca.

Which Nova to start with..

I'm ready to try a Novarossi. It will go in my MBX7 or 8ight 3.0 when it arrives.
I have run RB WS7, Ninja B01, old AXE Rossi Cobra. The RB was the best!
So..with budget of $450 for engine and pipe MAX.
P5XLT or Plus21-BTTA Tuned ??
Pipe looks like 2096/41021 ?

Pipes I have: JP-1, JP-4, RE-11

Suggestions please!