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Old 11-25-2009, 06:33 PM   #1
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Default IM Leaking!!!!

So my practice motor I have is near brand new, and I noticed almost right away the fron bearing was leaking, its quite a common occurance. Does anyone know what to do to stop leaks in the front bearing?
Replacing it, etc.?
This never happend in my v spec or ninja.
And the motor is a Dynamite Mach 2 .21 / starter box backplate

Thanks
-MT
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Old 11-25-2009, 06:37 PM   #2
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Change the front bearing. While you are at it, you can replace the rear as well if you feel like it.
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Old 11-25-2009, 06:40 PM   #3
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Quote:
Originally Posted by portyansky View Post
Change the front bearing. While you are at it, you can replace the rear as well if you feel like it.
+1 May check into upgrading the bearing if available for the engine, ex ceramic. You can contact Mark at Powerhouse if you dont feel comfortable doing it he will treat you right,.
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Old 11-25-2009, 06:49 PM   #4
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Now does the bearing have to be FOR the mach 2?
Or is it just a regular bearing that meets the size specs?
And when you buy just front bearing how much? and where can I buy one?
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Old 11-25-2009, 07:00 PM   #5
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Im sure as long as it fits the size specs, cost varies with type of bearing. TKO bearings are the best in my opinion you can get with them about it .
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Old 11-25-2009, 07:43 PM   #6
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http://www.amainhobbies.com/product_...Novarossi-RB-1
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Old 11-25-2009, 07:45 PM   #7
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before u do that though check and see if theres wet spots of fuel around the outside of the carb cause my was leaking around the carb and i seen oil coming out behind the flywheel
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Old 11-25-2009, 08:56 PM   #8
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It is new so maybe too rich while break in.
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Old 11-25-2009, 10:00 PM   #9
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Alan is right, sometimes when breaking a motor in it leaves fuel in the case and it can leak out while sitting. Also have heard if you leave the fuel tank full it can siphon in to the motor while sitting for a while. A washer too big behind the flywheel collet could rub the seal on the bearing. Tko 7x19would be a good bearing if you need one.

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Old 11-25-2009, 11:51 PM   #10
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Check that your carb is fully seated into crankcase. I noticed on the dynamite "Big Red" .28 engines the carb's O-ring was not sealing out the box.

Loosen the pinch bolt and push down on the carb while re-tightening the pinch bolt. If that doesn't help replace your bearing. Boca Bearings sell just the front, rear, or set. Ceramic or steel if you like.

Front Bearing Size: 7X19X6
Rear Bearing Size: 13X24X6

Links below say they are for the Mach 427, they are the same size as the Mach 2.

Steel:
http://www.bocabearings.com/main1.as...7&n=*ENK-005HP

Ceramic:
http://www.bocabearings.com/main1.as...n=*ENK-005C-LP

Ceramic High Performance:
http://www.bocabearings.com/main1.as...n=*ENK-005C-HP
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Old 11-26-2009, 06:56 AM   #11
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I am going to buy the Boca bearing that aaron recommended, the second link, now how do you removethe bearing from the case, i was always tempted to do it but afraid that I might mis-align it . What the easiest most economical way?
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Old 11-26-2009, 07:31 AM   #12
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Well I just bought the boca bearings
Will see how they perform
.
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Old 11-26-2009, 07:49 AM   #13
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Could have had TKO's for less.
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Old 11-26-2009, 08:06 AM   #14
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I definitly would have gone with TKO over the boca.....TKO FTW best bearings ever
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Old 11-26-2009, 08:40 AM   #15
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Congrats MTclassPro and Happy Thanksgiving!

I just replaced my engine's bearings last week using the oven method to get them out. I usually use a propane torch.

First I took the engine apart, down to just the crankcase. If there is a O-ring inside the base of the area where the carb inserts into don't forget to remove it. Remove your pinch-bolt assembly also.

Since I was putting it in the oven I didn't want to have toxic fumes in the oven so I rinsed the crankcase with Simple Green and water, then blew it out with air real good. I preheated the oven to 350*, and put the crankcase in for ten minutes.

After that I used this method to tap them out and put em back in.
http://www.youtube.com/watch?v=WhpwsjYoxM0
http://www.youtube.com/watch?v=Q3xIWcdQFiE
*Very easy, don't worry. After your done get back out there and kick a_ _*

Pm me if you have any more questions,
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