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Old September 27th, 2020, 11:47 AM   #1
Mohawk
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Pics of 250 cylinders out of the block

Hi Guys, does anyone have any pics of an 08-12 250R cylinder block with the liners removed ? Just looking to see how the liners are sealed in the block.

Thanks
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Old September 28th, 2020, 12:57 AM   #2
Singh2jz
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Quote:
Originally Posted by Mohawk View Post
Hi Guys, does anyone have any pics of an 08-12 250R cylinder block with the liners removed ? Just looking to see how the liners are sealed in the block.

Thanks
I've got one opened up!
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Old September 28th, 2020, 01:31 PM   #3
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How about this? ZZR600 and Ninja 250 liners. Seal is with O-rings. If you're boring for larger liners, just use press-fit and anaerobic sealant on assembly. I also like liner-flange to be 0,05mm above deck for extra clamping, although not really needed on un-boosted applications.

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Old September 28th, 2020, 02:10 PM   #4
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More of liners:


and block:


Thanks bruce!
https://www.ninjette.org/forums/show...3&postcount=27
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Old September 28th, 2020, 02:30 PM   #5
Mohawk
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Thanks Danny, the 600/250 pic is one of mine. I found that post from Bruce, but the pic had timed out. So the new gen liner is as I recalled with the O-ring in the cylinder, what I really want to know is what is the OD inside that O-ring groove ?

The block pic is a pre-gen one as no cam chain tensioner boss. The pre-gen did not bother with an upper O-ring, because the head gasket forms that seal. Not sure why they added the upper one to new-gen. Either way I have a spare set of 600 liners that can be fitted & bored to 66 or 67mm for a 335 or 345cc big bore.

Thanks
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Old September 28th, 2020, 02:38 PM   #6
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OD of groove in new-gen liner? To determine liner thickness there?

I do have pre-gen block I can open up for you. Will have to be after this weekend when I'm back from holiday.
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Old September 28th, 2020, 03:11 PM   #7
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Originally Posted by DannoXYZ View Post
OD of groove in new-gen liner? To determine liner thickness there?

I do have pre-gen block I can open up for you. Will have to be after this weekend when I'm back from holiday.
I’m Only interested in the new-gen block at the moment. I have one that I bored to 64mm for a 315cc. These are being fitted to 300 engines !

That upper O-ring groove reduces the liner thickness, so I’ll get them pressed out of another block & replace with 600 liners.

Thanks
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Old January 31st, 2023, 02:21 PM   #8
Mohawk
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So the world went mad & many people got furlough & did their bike projects. Unfortunately I had Covid badly right at the start & then had to work right through. So everything got parked. So finally started on the ZZR 315 engine build & finally got the X300 cylinder bored & replated. Just arrived yesterday.

https://www.dropbox.com/s/omm2ghxd9t...71A0.jpeg?dl=0

https://www.dropbox.com/s/uh6di2vnkp...DE71.jpeg?dl=0
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