XS250 cylinder swap from XS360?

M

miki

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• Nov 18, 2019

• #1

Hi,
thinking to get more power and speed from my XS250 so question is will XS360 cylinder jug with pistons fit to my xs 250 cylinder head and does pistons fit to XS250 cranck connecting rods holes?
Also if there is something else what I am forgetting that will require modifications in this change (carbs,cam,cam chain...)?
Any experience?

Thank you.

 

Last edited: Nov 19, 2019

M

miki

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• Nov 19, 2019

• #2

Nobody have tried this?

 

M

miki

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• Nov 21, 2019

• #3

Bump

 

NewHavenMike

1976 XS360C

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• Nov 21, 2019

• #4

The only difference is that the bore size goes from 55mm to 66mm. Everything else is the same engine wise, from what Ive glanced over in my manual.

Chances are that the sleeves will not fit into a 250 case without machining. The carbs on the 360 are bigger too.

All of this stuff is somewhat hard to find.

 

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miki

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• Nov 22, 2019

• #5

Thank you for reply.I found on bay few xs360 jugs on reasonable price so i maybe try this (although shipping cost to Europe from USA is killer...).I tought i could rejet my carbs with larger jets and move needles up so that can be closer to larger mikuni BS34 like on xs360.My main concern that xs250 cylinder head with valves made for 250cc can not take xs360 power.