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Author Topic: 650 motor in GT250  (Read 1840 times)

CrazyChris

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650 motor in GT250
« on: September 25, 2012, 10:58:29 AM »

Howzit guys.

Well as the title says, I got the 650 motor and I'm planning on dropping it into the 250 frame. Checked the mountings and it can work. What I want to know is what do I need for the rest of the conversion? Will the 250 CDI work? Will the chain of the 250 work as well? Any help will be appreciated.
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MaxBiker

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Re: 650 motor in GT250
« Reply #1 on: September 25, 2012, 11:40:29 AM »

your going to need a whole lot of new things. the chain is meant for a 250, so that will have to be changed, the rim will have to be changed. you might have to get a new swing arm. and no, the Computer will not work with a 650 motor. you will have to get a 650 specific ECU. you might even have to change the sensors. also, the intake and exhaust ports are bigger on the 650, so you will need a new exhaust and new throttle body, whitch might require a new airbox all together...... and there is more probably. I would also look into upgrading the single disc front brake to a twin for the extra weight......
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CrazyChris

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Re: 650 motor in GT250
« Reply #2 on: September 25, 2012, 11:45:18 AM »

I figured the CDI won't work. Had a look at the exhaust as well and saw that will need to be changed. Luckily I have a connection in that aspect. Running a 160 rear tire already so I think that might work (might be wrong though). But why the swingarm? Space issues or something else?
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Snowfox

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Re: Re: 650 motor in GT250
« Reply #3 on: September 25, 2012, 11:59:28 AM »

The frame is different to begin with.
It'd twist and bend with a 650 in it.
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woody101088

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Re: 650 motor in GT250
« Reply #4 on: September 25, 2012, 03:09:49 PM »

Hyosung was going to use the 250 Frame to begin with to support the 650 engine, but changed their minds>

I say go for it, and keep it registered as a 250 to keep the insurance low ;-).. Just reinforce everything on the bike.

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MaxBiker

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Re: 650 motor in GT250
« Reply #5 on: September 25, 2012, 03:38:15 PM »

I guess you could buy a wrecked 650 that has only had the fairings and frame ruined and swap everything over. wouldn't you also need a diff tach so it would read the rev's correctly?
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CrazyChris

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Re: 650 motor in GT250
« Reply #6 on: September 25, 2012, 03:51:39 PM »

I can't see why the tach on the 250 shouldn't read correctly but I might be wrong. The motor is coming of a bike that one of my friends is stripping for spares (he needs the frame and other stuff but not the motor) and I read somewhere on the forum about a guy that did drop the 650 motor into the 250 frame. Everything lines up perfectly though. Just thinking I'm gonna fabricate mountings for the 650 motor to use the mounts that sits in the V as well effectively using 5 mounts instead of the usual three on the 250. I think if I change my fork oil to a higher weight and install a better rear shock it should be fine. Double brake discs will be sorted as soon as the motor is in. I might be wrong but I don't foresee any real issues after that.
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Spidey

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Re: 650 motor in GT250
« Reply #7 on: September 25, 2012, 03:55:49 PM »

does your two-fiddy only have 1 disc up front?

mine has 2
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CrazyChris

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Re: 650 motor in GT250
« Reply #8 on: September 25, 2012, 04:06:27 PM »

I'm one of the unlucky sods whose bike has a single disc in front. Looking for another disc and caliper though.
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Alantris

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Re: 650 motor in GT250
« Reply #9 on: September 25, 2012, 05:17:18 PM »

Will it work.. yes, will it be safe, i don't know. You'll probably want to improve the frame or you might find yourself in a crazy tankslap at 120mph.
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