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Big Block Talk! Everything about swapping a big block engine into your cart!



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Unread 03-03-2013, 08:56 PM   #1
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Default g9 engine swap question

So I picked up a yamaha g9 but the engine is shot, so I'm looking to replace it with another engine. I read the stock engine is a 285cc 8.5hp engine, so will any 285cc 8.5 hp or greater engine make it run like stock/slightly better?
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Unread 03-03-2013, 09:21 PM   #2
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Default Re: g9 engine swap question

Put a 12-16hp clone in,they are similar in size,but alot more bang for the buck.They have alot more power and are way cheaper than the OEM motors.Hope this helps.
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Unread 03-03-2013, 10:55 PM   #3
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Default Re: g9 engine swap question

I thought the 285 was 9.4hp, but yeah something like that. The clone is a great deal at about $300 for a brand new 420cc engine. If you get the $50 adapter to put the clutch on and some odds and ends to make a mount and plumb the airbox and exhaust you are set. Even the 390cc clone should have more power at 13hp, but often not that much cheaper than the 420 which has more torque. They are a lot more fun, but it is a project to get everything hooked up. There are various threads here for doing a G9 clone.

Odds are you might pay more than 300 for a stock good running engine that is not burning oil.
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Unread 03-04-2013, 01:20 AM   #4
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Default Re: g9 engine swap question

I was going off the specs in the manual for the 285/8.5 information. I'm looking at the clones now, but I wasn't expecting to get an actual yamaha g9 stock engine, I was thinking 10 hp snowblower or something, but that might be more of a project.
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Unread 03-04-2013, 06:22 PM   #5
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Default Re: g9 engine swap question

The clones are the cheapest, that is why people are using them so much. Most all the honda parts fit them they are such a copy.
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Unread 03-05-2013, 05:02 PM   #6
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Default Re: g9 engine swap question

Would an 87 yamaha phaser 485 snowmobile engine be enough power? I haven't read too far into the work behind using a snowmobile engine, but I could get it pretty cheap.
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Unread 03-06-2013, 11:20 PM   #7
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Default Re: g9 engine swap question

That would be a lot of power, check out the section on sled engine swaps. Problem with sled engines is you need the pipe (exhaust) to make the power they have, and if you mod the pipe you have to keep the same length and shape but you can rotate it and weld it back up.
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