fubars
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Post by fubars on May 31, 2021 17:51:57 GMT 1
Took the head off the 250lc today and its still on the original pistons far as I can tell, would it be prudent to get a rebore or just leave it ?
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Post by midlifecrisisrd on May 31, 2021 17:54:07 GMT 1
How many miles are on it?
Steve
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fubars
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Post by fubars on May 31, 2021 18:06:12 GMT 1
How many miles are on it? Steve 28000 |
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Post by yamman1066 on May 31, 2021 18:19:08 GMT 1
rebore
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Post by midlifecrisisrd on May 31, 2021 18:26:13 GMT 1
Hell yeah 🤣
If that's still on standard bore it's way past its best unless it's had new barrels fitted within 10k miles lol
Steve
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Post by beardy on May 31, 2021 18:52:06 GMT 1
How’s it running? What’s compression like? Is where I’d start
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fubars
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Post by fubars on May 31, 2021 20:07:24 GMT 1
How’s it running? What’s compression like? Is where I’d start Wasn't running great. |
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Post by shaunthe2nd on May 31, 2021 20:19:44 GMT 1
You have done well to get 28k on original bore, so probably ready for a rebore.
Do pistons show carbon below rings, and any wear marks in the barrel?
As above, check compression, I think you looking for 100-110psi on a 250.
Not too expensive, prob max £200-£250 for rebore/pistons/rings/gaskets to refresh top end, especially if reason for poor running is down to this.
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Post by chrisg on May 31, 2021 20:48:32 GMT 1
It may have different cylinders fitted, as opposed to the originals.
Does it rattle? If your worried, take it to a reputable company and have the cylinders measured. It may need a re bore but don't rebore for rebores sake.
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Post by pedheadfred on May 31, 2021 21:11:10 GMT 1
As above get reputable engineer to check bores and pistons.
Obviously rings ware piston groves and can rattle which will allow cause blowbuy.
Bores can look ok but ware in middle making piston skirt slap and rock.
Excessive can snap pistons skirts off if thrashed alot.
What part the country you based at so we can advise who to go to
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fubars
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Post by fubars on May 31, 2021 21:33:21 GMT 1
Didn't notice any rattles, I think they are the original pistons they are marked 4LO I will take a phone of one and the barrels tomorrow.
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fubars
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Post by fubars on May 31, 2021 21:39:35 GMT 1
As above get reputable engineer to check bores and pistons. Obviously rings ware piston groves and can rattle which will allow cause blowbuy. Bores can look ok but ware in middle making piston skirt slap and rock. Excessive can snap pistons skirts off if thrashed alot. What part the country you based at so we can advise who to go to I'm in Nottinghamshire but not not far from Lincoln don't know if anyone near me. |
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Post by pedheadfred on May 31, 2021 21:42:34 GMT 1
Go to Linby see Ron Phillips Fahron engineering. He is excellent or if your closer to Lincoln go to Webb's and See Andy Webb or Steve his mechanic. My choice would be Ron tell him Mr Williams send you, were mates. |
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fubars
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Posts: 294
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Post by fubars on May 31, 2021 21:54:01 GMT 1
Go to Linby see Ron Phillips Fahron engineering. He is excellent or if your closer to Lincoln go to Webb's and See Andy Webb or Steve his mechanic. My choice would be Ron tell him Mr Williams send you, were mates. Thanks for that Webb's is closer but will give Ron a ring first do you have a contact number ? |
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Post by pedheadfred on May 31, 2021 21:55:25 GMT 1
Give me a few mins will pm you it 👍
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Post by chrisg on Jun 2, 2021 10:40:45 GMT 1
Thinking about it, if the 28000 miles is correct, it must have had new cylinders fitted if it's on original bore. I would say 8 to 10k miles is a guide to cylinder life, if you don't have a blow up.
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Post by midlifecrisisrd on Jun 2, 2021 12:04:03 GMT 1
I've had 2 ypvs motors, one at 26k and one at 29k that were both unopened and on standard bore
It is possible If they are treated well
Steve
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Post by chrisg on Jun 2, 2021 15:00:11 GMT 1
I've had 2 ypvs motors, one at 26k and one at 29k that were both unopened and on standard bore It is possible If they are treated well Steve Wow, must have had an easy life and with modern 2t oil. |
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