wicat3

Hey guys im new to the board and had a strange question to some. Im looking into getting a rebel and wanted to build it into a bobber. I want to know if it would be possible to put a bigger enigine like a 600cc from a honda 600cbr? I know there are two years that came with a 450cc motor but i didnt know if i could put a newer or bigger motor to the frame saftely? Thanks for all the help.

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flitecontrol

Welcome to the forum. The 250 and 450 Rebel have different frames. This subject has come up before and IIRC, the issue was raised that the 250 frame probably wasn't designed for a much heavier engine. So if you find a larger motor that fit, you might have to modify/rebuild the frame for it to be safe. Ditto for the 450.

Not saying it can't be done, but you need to know what you're doing to do it safely.

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I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!

2001 Rebel 250, 1989 Vulcan 750
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wicat3

thanks thats kinda what i figured but wasnt sure

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fastpakr

On the plus side, if you have a burning desire for a smaller engine, the swap down to a 125 isn't too bad!

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'99 Vulcan 500 - current DD, 27k miles and counting
'83 Honda Silverwing GL650i - future DD, still in pieces

cagie

I think from an engineering stand point the real problem with the Rebel frame is it's ability to handle the torque of a larger engine. A 250 engine producing 18hp at WOT doesn't produce a lot of torque. Plus the engine is lighter, but by how much that would really matter is out of my scope. If a person were to weld up a dual downtube with cross members, the twist potential would be greatly reduced. There are others on the board that might offer their opinion to my thoughts...

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Comments contained in my posts are not intended to cause physical or psychological stress and are mearly my two cents worth, and in this economy, that's cheap!
87 CMX250C 'the Pygmy Pony'
87 CMX450C 'Black Lithium'

bB2NER

Jacks shop stuffed a 750 motor into a 450 frame along with a 350 4 cylinder motor into a 250 frame so it can be done with enough work and money.

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Current Rides: Drive less Ride more!!!
09' Rebel 250 Bobber (General Lee Tribute)
86' Rebel 250 Limited (black/gold)
79' Hawk CB400T (black)
92' Shadow 1100C (red/silver panels and frame)