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Author Topic: 2015 GT250R engine in 2004 GT250  (Read 222 times)

dhabicht1

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2015 GT250R engine in 2004 GT250
« on: June 23, 2018, 02:50:12 PM »

Just bought this 04 which sat for years, the previous owner brought it to his neighbor who ended up destroying the piston and rings in cylinder 2.  I can get a used engine cheap with 7k miles on it but it is from a 2015 GT250R.  I was just wondering if it is possible to just swap the engine over and use the carbs on my old engine?  Thanks for the replies
« Last Edit: June 23, 2018, 02:53:13 PM by dhabicht1 »
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spit051261

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Re: 2015 GT250R engine in 2004 GT250
« Reply #1 on: June 23, 2018, 03:59:43 PM »

I had to read your question 3 times  :o
I have no idea what you are asking .
Do you want to use..............forget it  >:(
BTW a 2015 engine will be an EFI and NO carbs .
« Last Edit: June 23, 2018, 04:06:07 PM by spit051261 »
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dhabicht1

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Re: 2015 GT250R engine in 2004 GT250
« Reply #2 on: June 23, 2018, 04:08:14 PM »

I want to buy a 2015 GT250R engine which I believe has EFI and try and put it into a 2004 GT250 which has carbs.  Is this possible and what would have to be changed on the 2015 engine to work with the carb version.  I will be using the carbs off of my 04.  Does the flywheel have to be changed? what else?
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spit051261

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Re: 2015 GT250R engine in 2004 GT250
« Reply #3 on: June 23, 2018, 04:36:58 PM »

Should be pretty close , mechanically anyway .
Electrically might be fun and games.
The person who will know is upside down the mod .
He will see your post and he will reply when he gets chance .
Sounds like you are having fun in the Hyosung world.
Welcome anyway  :)
« Last Edit: June 23, 2018, 04:48:18 PM by spit051261 »
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2010  GT650R in the best colour RED

dhabicht1

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Re: 2015 GT250R engine in 2004 GT250
« Reply #4 on: June 23, 2018, 05:04:25 PM »

Thank you for the reply and the kind welcome.  I am looking forward to getting this machine up and running.  I think I am going to pull the trigger the 2015 motor is only $400  So all together I'll only have $1,100 into it and hopefully any issues I may have will be fixable with the forums help.
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umop-ǝpisdn

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Re: 2015 GT250R engine in 2004 GT250
« Reply #5 on: June 24, 2018, 11:14:21 AM »

I've never done this myself, but if it's anything like the 650s, the engines will be identical, but the flywheel will be different.

The manifolds may also be ever so slightly different.

In summary, it should work. Obviously things get ridiculous is you are trying to convert to EFI. As long as you keep your carbies, then all you need to do is swap the flywheel from your old motor onto the new one and also swap the inlet manifolds from your old motor onto the new one.

Expect a few small, piss-ant complications along the way, obviously, but those two should be your major ones.

Getting the flywheel off requires a specific size of bolt. You tighten it into the hole in the middle of your flywheel and it should just pop off. To make things interesting though, I don't know what the specific size of bolt is.  ::)
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dhabicht1

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Re: 2015 GT250R engine in 2004 GT250
« Reply #6 on: June 24, 2018, 11:51:58 AM »

Thanks for the info, picking up the 2015 engine today but won't get a chance to work on it until next weekend.  I'll update then.
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Cloud

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Re: 2015 GT250R engine in 2004 GT250
« Reply #7 on: June 27, 2018, 12:31:33 PM »


It works.

I have a EFI GT250 flywheel, rotor/stator, and crank position sensor, bolted to the side of a GT125 crankshaft, running GT125 carbs and a GT125 TCI sparkbox.

Carbs make everything easy.

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spit051261

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Re: 2015 GT250R engine in 2004 GT250
« Reply #8 on: June 27, 2018, 12:51:14 PM »


It works.

I have a EFI GT250 flywheel, rotor/stator, and crank position sensor, bolted to the side of a GT125 crankshaft, running GT125 carbs and a GT125 TCI sparkbox.

Carbs make everything easy.
Welcome back  :)
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dhabicht1

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Re: 2015 GT250R engine in 2004 GT250
« Reply #9 on: July 10, 2018, 07:09:54 PM »

Didn't work with the EFI magneto and stator, switched to the old carby magneto and stator and it still doesn't work.  Getting spark and fuel turns over hard with the new battery maybe the crank sensors no good? It is the one out of the old engine?
« Last Edit: July 11, 2018, 11:32:34 AM by dhabicht1 »
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