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Old 08-01-2010, 06:41 PM   #1
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Talking Resurrecting a Mugen Ninja GRP/ RB Worlds S7

I have a Mugen Ninja MR21 B01 made by GRP. I need a pistion /sleeve/bearings.

is it true TQ racings motor is exactly Identical. Just trying to confirm.

Also, if they have more than one motor, which one.

I also need bearing size front/rear


Also, I need bearing sizes for a RB concepts Worlds S7 front/rear.

Would like to bring both back to life.



Thanks.

Last edited by Dr. Evil; 08-01-2010 at 07:01 PM.
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Old 08-01-2010, 07:24 PM   #2
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Talking Bearings

Hi. If anyone knows the Mugen MR21 bearing sizes, I would appreciate it.

Thanks much.
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Old 08-01-2010, 07:56 PM   #3
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the bearing size is the same as the v-spec
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Old 08-01-2010, 08:04 PM   #4
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Default Bearing sizes

Hi,
The front bearing is the common 7x19x6mm
The Rear Bearing is 14x25.4x6mm

I'm afraid you'll be hard pressed to find a p/s/conrod set available these days for the Mugen GRP based Ninja MR series engine. You'd be better off trying to source these similar parts from TQ or Reds or even Tecno-power as these engines are exact productions of the GRP based engines.
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Old 08-01-2010, 08:16 PM   #5
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Check your PM's Dr. Evil, "rageworks" will get ya going.
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Old 08-01-2010, 10:21 PM   #6
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The P/S/R from TQ's 501T will fit the MR Ninja. Have your hobby shop call TQ or email them at info@hobbyworks.com
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Old 08-25-2010, 03:02 PM   #7
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Default re: front bearing

Hi. The front bearing in my engine seems to just want to fall out. I can put the bearing in with my pinky. I don't see any kind of a crack in he case.

Any suggestions??

Thanks
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Old 08-25-2010, 03:09 PM   #8
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Default p/s

Quote:
Originally Posted by Dr. Evil View Post
I have a Mugen Ninja MR21 B01 made by GRP. I need a pistion /sleeve/bearings.

is it true TQ racings motor is exactly Identical. Just trying to confirm.

Also, if they have more than one motor, which one.

I also need bearing size front/rear


Also, I need bearing sizes for a RB concepts Worlds S7 front/rear.

Would like to bring both back to life.



Thanks.
There is a grp new tuned p/s and rod on.here forsale 110.00 shipped. Same thing.
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Last edited by teamlosi906; 08-25-2010 at 03:11 PM. Reason: add
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Old 08-25-2010, 03:31 PM   #9
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Quote:
Originally Posted by Infinity View Post
Hi,
The front bearing is the common 7x19x6mm
The Rear Bearing is 14x25.4x6mm

I'm afraid you'll be hard pressed to find a p/s/conrod set available these days for the Mugen GRP based Ninja MR series engine. You'd be better off trying to source these similar parts from TQ or Reds or even Tecno-power as these engines are exact productions of the GRP based engines.
Incorrect

Tecno Power Engines have different P/S, case, carburetor, head button, cooling head and crankshaft (pretty much the whole engine) compared to the old school GRP engines.

The Tecno Power internals will interchange without any problems, but to clear the air Rody's internals in his designed engine are in fact updated and improved. The TQ engine will most represent the original GRP engines with only a rod and carburetor updates.

Nothing against the TQ or GRP original engines, they are great running engine today as they were years ago, but not the latest Rody design or development.
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Old 08-25-2010, 04:13 PM   #10
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Quote:
Originally Posted by Dr. Evil View Post
Hi. The front bearing in my engine seems to just want to fall out. I can put the bearing in with my pinky. I don't see any kind of a crack in he case.

Any suggestions??

Thanks
You've either got the wrong size bearing or there is something SERIOUSLY wrong with your case.
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Old 08-25-2010, 08:03 PM   #11
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The front bearing probably spun in the case.
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Old 08-26-2010, 07:10 AM   #12
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Talking Front Bearing

Sounds to me if you are correct about the spun bearing, (Hmm) I guess

If I like that kind of engine, I should get the TQ and not do an upgrade.

Does the TQ use the same bearings?? The ninja has ceramic bearings.

I don't think the TQ has them right??



In reference to the RB Concepts WS7, I tried to get this to run right. Found I

had a problem with the buggies brakes (They were too tight) and after fixing

this problem, the engine temps dropped 80 degrees. Also, after this fix and

getting the temps right. The engine was pulling wheelies up until the

connecting rod snapped and threw debris all over the engine.

Oh well, I had a new p/s/con rod, so I am going through a break in with this.
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Old 08-26-2010, 05:06 PM   #13
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wow..............
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Old 08-26-2010, 05:52 PM   #14
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Quote:
Originally Posted by Dr. Evil View Post
Sounds to me if you are correct about the spun bearing, (Hmm) I guess

If I like that kind of engine, I should get the TQ and not do an upgrade.

Does the TQ use the same bearings?? The ninja has ceramic bearings.

I don't think the TQ has them right??
The TQ engine is exactly the same as the GRP ...........EXCEPT........... the TQ has an improved rod (which will still fit your GRP) and a change to the carb. These were the improvements that Rody felt the GRP could use.

So................ all the TQ internals will work in the GRP.


Spun front bearing? If the crankcase isn't too worn, you could spread a thin film of Loctite sleeve/bearing retainer on the crankcase front bearing bore and a thin film on the bearing outer race. That stuff is incredible when it come to filling small gaps and securing one component inside another.
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Old 08-26-2010, 10:07 PM   #15
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Talking Loctite

I put some on about 2 weeks ago. I need a p/s/con rod. I thought if it didn't work, the money would be wasted. Now, I could at least get the TQ engine and have a spare p/s/con rod.
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