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#1 |
Join Date: May 2020
Location: Calgary
Posts: 16
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Crf230f cylinder in an X31?
I'm having a hell of a time finding top end parts for my X31.
ZA169FMM, more like a 65mm bore with 15mm pin. It looks like the valves are the same dimensions as the crf230, so I ordered seals from Honda already. |
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#2 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
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Yep, it should work. You'd be the first on here to do it though, so make sure that you document it!
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#3 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,651
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I recently installed the CRF230F Wiseco 11:1 piston on my X22R 250. It's a 65.5mm bore with 15mm pin.
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2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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#4 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,651
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The CRF230F Big Bore kits and cams will also work on these engines. https://www.ebay.com/itm/Athena-67mm...2228ab027919bc
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2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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#5 |
Join Date: May 2020
Location: Calgary
Posts: 16
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I see a bunch of pistons sold as 65.5mm of, do you guys think it means they are actually 65.5mm of or they are meant to for a 65.5mm cylinder??
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#6 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,651
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They are meant for a 65.5mm bore. I don't remember the exact measurement but the piston is slightly smaller.
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2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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#7 |
Join Date: May 2020
Location: Calgary
Posts: 16
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Mine is like 64.98mm.
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#8 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,651
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Stock piston on a 65.5mm cylinder would be around 65.49-65.47mm. Service limit is 56.40mm.
Did you measure the bore of the cylinder?
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2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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#9 |
Join Date: May 2020
Location: Calgary
Posts: 16
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Yea the cylinder is 65.5 top, bottom and middle.
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#10 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,651
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So yeah that piston is worn out at 64.98mm.
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2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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#11 |
Join Date: Mar 2008
Posts: 2,436
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From CRF230F shop manual:
![]() Measure at the gauge point w/ correct tool & not as these http://www.chinapartsdepot.com/shopp...exd.asp?id=771 clowns as possible === The average Chinese Joe will just put another 67 BBK https://item.taobao.com/item.htm?id=617131505511 when worn. Anway the standard 65.5 chonda nowadays is using [0.8/0.8/2.8]. Why such 2.8 oil rings cuz there's history reason https://motorcycle.sh.cn/thread-17320800-1-1.html (Change to destop mode if via from mobile device) Suzuki F10A (& copycats) 2.8 really works unlike the bike specfic thin rings they failed to copy ... ![]()
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Last edited by humanbeing; 06-11-2020 at 09:54 PM. |
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#12 |
Join Date: May 2020
Location: Calgary
Posts: 16
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Yea, 0.52mm clearance is double what it needs to be.
I have a new piston coming. Bore seems alright. Once I get the new valve seals and piston installed and the bike running, I'm going to order a crf230 big bore kit whick I think is about 67mm, and they come with a domed piston. But I just want to get back riding asap. |
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#13 | |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,651
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Quote:
Here's a link to the CRF230F shop manual. https://www.google.com/url?q=https:/...91965565636000
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2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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#14 |
Join Date: Nov 2017
Location: Marseille, France -> Conakry, Guinea
Posts: 1,481
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How old is this bike? A piston that worn out would likely not run in the engine, I've never seen one wear out a whole half mm. The piston/cylinder would look pretty gnarly if it was that much worn out.
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#15 |
Moderator
Join Date: Oct 2016
Location: Houma, La.
Posts: 11,651
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I was thinking the same thing. A new cylinder and piston would be the way to go. Might as well do the BBK.
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2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel |
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