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Offline zach87cp

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390 crack
« on: August 20, 2011, 07:32:50 pm »
Today our 390 cracked the block right at the top of the starter by the shroud and below the starter i think i can get someone too weld it did anyone ever see them break there its even a honda block not a clone
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Offline Ron Atchison/A.C.E. Race Engines

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Re: 390 crack
« Reply #1 on: August 20, 2011, 08:37:54 pm »

I have had them crack in the lower cylinder support area but, not in the starter area..sounds like the starter might be binding-up or similar? Proper welding will be just fine.
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Offline Old Goat

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Re: 390 crack
« Reply #2 on: August 23, 2011, 10:51:16 pm »
Zach, check out the GX390 clone blocks on ebay. I've been running one and haven't had any problems, yet. They are probably a lot cheaper than what it will cost you to weld yours. http://www.ebay.com/itm/NEW-Honda-GX390-13-hp-ENGINE-BLOCK-13HP-CYLINDER-BLOCK-/220732493888?pt=LH_DefaultDomain_0&hash=item3364ae9040
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Offline Rooster

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Re: 390 crack
« Reply #3 on: August 24, 2011, 12:00:46 am »
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Offline Ron Atchison/A.C.E. Race Engines

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Re: 390 crack
« Reply #4 on: August 24, 2011, 09:07:57 am »
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Offline royalblu68f100

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Re: 390 crack
« Reply #5 on: August 24, 2011, 09:11:57 am »
Hey Ron how big can you reasonably make a 390/420?
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Offline Rooster

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Re: 390 crack
« Reply #6 on: August 24, 2011, 09:59:38 am »
Quote from: Ron Atchison on August 24, 2011, 09:07:57 am
the 420cc (16hp) bore is 2mm bigger.
Is that not a good thing?
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Offline zach87cp

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Re: 390 crack
« Reply #7 on: August 24, 2011, 11:32:02 am »
It should be about welded by now lol one of my buddies is good at welding alumium i dropped it off tuesday,im hoping too have it runing friday .im gonna have too drill and wire the pan bolts they vibrate loose i heard thats quite a common problem with the 390s .
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Offline Huffy044

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Re: 390 crack
« Reply #8 on: August 24, 2011, 08:57:04 pm »
Pan bolts vibrating loose.........maybe we need to check the balance?
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Offline DanW

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Re: 390 crack
« Reply #9 on: August 24, 2011, 09:44:44 pm »
Single cylinder... ballanced... haha
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Offline George Herrin

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Re: 390 crack
« Reply #10 on: August 24, 2011, 09:46:45 pm »
My 390 is smooth as glass. Doesm't vibrate at all.
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Offline Ron Atchison/A.C.E. Race Engines

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Re: 390 crack
« Reply #11 on: August 24, 2011, 10:43:56 pm »
Quote from: royalblu68f100 on August 24, 2011, 09:11:57 am
Hey Ron how big can you reasonably make a 390/420?

I get them in the 485cc range but, they are hard on the rods. 440cc is the most reasonable.
Quote from: zach87cp on August 24, 2011, 11:32:02 am
im gonna have too drill and wire the pan bolts they vibrate loose i heard thats quite a common problem with the 390s .

The side cover bolts do vibrate out for sure..63% balancing is the best for what we use them for. I will recommend to red loctite studs in the block and use nylock nuts for minimum failure.

Quote from: Rooster on August 24, 2011, 09:59:38 am
Is that not a good thing?


no...especially with Zack having all 390 parts.

-Ron.
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