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Old Oct 12, 2018 | 02:05 PM
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Default Engine swap

i have a friend that has a 120 M8, he is talking about selling his 120 engine and getting a 124 FM kit with ported heads when it comes out. I’m thinkin about buyin the 120 off him. I’m wondering if it would be easier to swap engines and just tear down my 107 and make that one a 124 instead of tearing down both engines. Any thoughts on this? Im wondering if removing the engine from the bike would be easier than tearing it down in the frame. Thanks for the input.
 
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Old Oct 12, 2018 | 02:17 PM
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Personally I think an in-chassis jug/piston swap would be easier than pulling the engine, plus it would give you an opportunity to see what you're getting in terms of cylinder and piston quality since you'll have it apart. IDK; could 6 one way and a half-dozen the other.
 
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Old Oct 12, 2018 | 02:23 PM
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that’s probably what we’re gonna do, I’m hoping someone with lots of experience working on these can chime in. I know the entire primary has to come off, I just don’t know what route is easier/best. I’m guessing taking the primary off is gonna be the same amount of work as swapping everything over.
 
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Old Oct 12, 2018 | 04:14 PM
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You should want to keep your vin no.
eassier to get 120 Cylinders from other bike.but than I would have the cylinders And pistons checked and see if they will be alright to use again.
i wouldn’t even begin to use them or pay for them until they was checked to make sure they could be used again.
 
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Old Oct 12, 2018 | 04:19 PM
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Originally Posted by rdc401
You should want to keep your vin no.
eassier to get 120 Cylinders from other bike.but than I would have the cylinders And pistons checked and see if they will be alright to use again.
i wouldn’t even begin to use them or pay for them until they was checked to make sure they could be used again.
theres no reason they wouldn’t be useable, if they’re working fine in his bike they’ll work in another. His cylinders only have 4K on em, a visual inspection is all that should be required so long as the top end goes back together how it came apart. The vin also isn’t on the engine, it’s on the frame, the serial number is on the engine cases . That doesn’t really matter since we both have voided warranties.
 
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Old Oct 15, 2018 | 11:16 AM
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Swap the components engine to engine. The serial numbers on the engine match the VIN for the bike. Unless you have a MSO for a replacement engine you risk future potential issues.
 
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Old Oct 15, 2018 | 09:25 PM
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ok thanks!!
 
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