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Old 07-23-2006, 10:15 PM   #1
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Default Ninja MR21B01 Carb settings?

Ok, I forgot my manual at work. So Does anyone know what the stock carburator settings are for the .MR21B01 buggy engine? Because when I fired up the engine to begin break in, it made a loud honking noise, as if it was set super lean. So i turned out all the needles to richen it up and popped a plug while doing so.

Some one help me I hate breaking in engines and don't particularly like screwing it up!
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Old 07-24-2006, 08:03 AM   #2
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also, what is a good replacement plug for this engine?
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Old 07-24-2006, 09:43 AM   #3
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Try:

HSN: 1/2 turn in from flush with needle body
LSN: 1 turn out from flush with slide
Idle: 1mm gap

This is what we started with when breaking in the MR. 21-B01 engines.

As for a plug, OS P3.
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Old 07-24-2006, 05:11 PM   #4
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Thanks, I'll try that. also what plug would be good to use, my local hobby store carries most turbo plugs for OS turbo engines, which one of those might work best. I'm also running 20% odonnel
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Old 07-24-2006, 09:58 PM   #5
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Quote:
Originally Posted by TKO
Try:

HSN: 1/2 turn in from flush with needle body
LSN: 1 turn out from flush with slide
Idle: 1mm gap

This is what we started with when breaking in the MR. 21-B01 engines.

As for a plug, OS P3.
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Old 07-25-2006, 07:02 AM   #6
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OS P3.

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Old 07-26-2006, 09:14 PM   #7
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P3? Sweet, that's the one I've been using.
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Old 07-29-2006, 07:47 AM   #8
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Default ninja temp

what is the temp ranges for this motor?
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Old 07-30-2006, 07:59 AM   #9
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If you're using an Exergen temp gun, 270-290* is about right on a broken in engine. Don't let them temps scare you, it's due to the shape of the head. You're getting a closer (hotter) reading than you would on most other motors.

Tune for smoke, power and sound.
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Old 07-30-2006, 09:57 AM   #10
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Default temp

Thank you for the reply I am currently breaking in a mr21-b01 the temp is at 215-230 at times and it is very rich in smoke. I am not used to this high temp at break in. May I ask if you know the factory needle settings as the Ninja web site nor my cd that came with the motor do not contain these.
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Old 07-30-2006, 10:48 AM   #11
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I have experienced fuel leakage from my head where the glow plug inserts with RB plugs, I was told to use just the ninja plugs. Any one else have this problem?
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Old 07-30-2006, 11:11 AM   #12
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Default plug

I was sent a different head gasket for the use of different plugs by have chose to use the factory type ninja plug . MR17008 it is tapered and uses no washer-gasket type seal. info is also on their web site.
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Old 07-30-2006, 11:17 AM   #13
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From Web Site;-------------This is an engine for competitions, high-powered with 3.5 cc capacity, for 1:8 BUGGY car models, specially designed to use in contests.
It is supplied with a “C – Conical” glow plug, which improves considerably engine performance in terms of both power and regular functions, whilst reducing fuel consumption.
Anyone wishing to use the “S – Standard” plug has to replace only the head gasket, found in the spare parts list for this engine.
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Old 07-30-2006, 07:00 PM   #14
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Quote:
Originally Posted by jik71107
Thank you for the reply I am currently breaking in a mr21-b01 the temp is at 215-230 at times and it is very rich in smoke. I am not used to this high temp at break in. May I ask if you know the factory needle settings as the Ninja web site nor my cd that came with the motor do not contain these.
I'll have to check the CD, but I believe it is 3-1/2 turns on the HSN and 5-1/2 on the LSN. If you're running 30% nitro, make sure you added that extra thin brass head button shim. Use the Ninja #6 or #5 plugs. They are a turbo plug so no brass washer (gasket).

215-230* is too cold. You're not getting the engine hot enough for the piston and sleeve to wear in properly. I ran mine for the first 5 tanks at around 260* but I had the motor really rich and put an old sock on teh cooling head to get the heat in it. After that, toss the sock and get it up to 270*. I was running mine at the Nats at 255-260* and the motor was hard to start and the piston was getting stuck at TDC. I ran 9 tanks before going to the Nats at my house. Then I ran three 10 minute practice sessions. I had to use a heat gun to get it turned over it was so tight. Then I saw the Mugen factory team guys and they said I was running it too cold and thats why it wasn't lossening up. I leaned it out to get it in the 270's and it loosened up after two 10 minute qualifiers. On my last qual, it came off at 272*. The Mugen team runs them at around 290*. But tune for smoke, performance and sound. Use the temps as a reference. At 272* mine was still pouring smoke out the exhaust. I'm sure its still fat and running hotter due to it still being a little tight. Once I get another 1/2 gallon through it, the temps should drop considerably and then I can lean her out for more power and run time.
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