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Post by Mr Kipling on Dec 7, 2017 17:36:09 GMT 1
Hi Campers another Q for u , been rummaging around my parts I have as I don't make a habit of parting with stuff I got no idea when it comes to value of stuff these days , thing is I have several pairs of tuned top ends an need an idea what to let them go for as I wont have any need for them in the future.. few are low bore sizes others mid.. many thxs..
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Post by muttsnuts on Dec 7, 2017 17:37:39 GMT 1
depends on who tuned them and what stage/state of tune, plus with or without powervalves and pistons
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Post by Mr Kipling on Dec 7, 2017 17:40:37 GMT 1
Stan n Bob tuned n with valves most are proddy tuned but I also have mild tuned..
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Post by Yogi on Dec 7, 2017 18:00:29 GMT 1
£20 a set and I'll have the lot   |
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Post by jackjabba on Dec 7, 2017 18:43:35 GMT 1
With a fresh rebore and new pistons £400 - £450 for a complete top end.
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Post by Mr Kipling on Dec 7, 2017 19:01:44 GMT 1
Really ?? some already got new pistons too go with them ... like I say been a while since I sold stuff so that's an eye opener..
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Post by jon on Dec 7, 2017 19:02:20 GMT 1
With a fresh rebore and new pistons £400 - £450 for a complete top end. Jack, I’d say this is the price for the barrels alone without powervalves judging on seeing the going rate for cylinders these days. Effectively it’s £200 for a rebore and pistons. I’d say more than £200 (for barrels including good power valves. Possibly £250 as you say but maybe more. I’ve seen PV’s go for £100 on their own recently. Of course the tuning part is the contention. Some would pay a little more, but some considerably less dependant on what the buyer was after. Bore size is also a big factor, possibly even more so on a PV, as larger sized rebores require the PV’s themselves to be modded so more extra effort/money. Plus large overbores have less life left. Therefore price is a tricky one on these. Put them up for what you think they are worth and see the interest. I’ve listed a set of 0.5 over PV cylinders for £250 if I end up splitting an engine and have had a fair bit of interest. These do have good bores and PV’s and are untuned with no thread repairs. Jon |
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Post by Mr Kipling on Dec 7, 2017 19:16:25 GMT 1
Good call jon , lowest set is 0.25 think the largest is 1.25.... back to the shed me thinks , thxs for the input guys appreciated.....
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Post by jackjabba on Dec 7, 2017 20:17:31 GMT 1
Just took 3 months to sell a top end advertised at £450, 1.00mm over with power valves and head. Fresh bore and new Mitaka pistons. But no takers. Sold to a forum member in the end.
I believe another set sold on the forum for £500.
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Post by Mr Kipling on Dec 7, 2017 23:19:22 GMT 1
Was gonna let em go for a little over the price of the pistons , looks like I was well n truly way out,
Going from the above I guess std barrels on std piston n bores more valuable and will be easier to sell than tuned , looks like another mini re-shuffle of whats going where is on the cards..
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Post by bare on Dec 8, 2017 6:11:31 GMT 1
Really? There are ALWAYS those who claim Massive prices/profits.
More often than not... pure unsubstantiated nonsense.
Look around.. ask friends..etc.
Internet quoted prices are too often : Moronic to Ridiculous.
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Post by jackjabba on Dec 8, 2017 9:49:31 GMT 1
Really? There are ALWAYS those who claim Massive prices/profits. More often than not... pure unsubstantiated nonsense. Look around.. ask friends..etc. Internet quoted prices are too often : Moronic to Ridiculous. Care to explain who that is directed at and why? |
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Post by rigga on Dec 8, 2017 16:56:57 GMT 1
Bare is having one of his days judging by some of his postings today ......
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Post by tony1964 on Dec 8, 2017 21:44:36 GMT 1
Jon,
Just reading your reply with regards to (Bore size is also a big factor, possibly even more so on a PV, as larger sized rebores require the PV’s themselves to be modded so more extra effort/money.)
How large are we talking about before the power valves themselves need to be modified??
Tony
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Post by guiri on Dec 8, 2017 22:24:00 GMT 1
im building a 350 ypvs race bike for next season..
if your needing standard barrels i have some and id be interested in a trade mate..
pm me if any interest.
cheers john.
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Post by headcoats on Dec 9, 2017 22:35:35 GMT 1
Jon, Just reading your reply with regards to (Bore size is also a big factor, possibly even more so on a PV, as larger sized rebores require the PV’s themselves to be modded so more extra effort/money.) How large are we talking about before the power valves themselves need to be modified?? Tony Mine were at 1.75mm over and the power valves needed trimming at that so maybe 1.50mm is the limit for leaving the powervalves alone |
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Post by tony1964 on Dec 10, 2017 15:09:58 GMT 1
Jon, Just reading your reply with regards to (Bore size is also a big factor, possibly even more so on a PV, as larger sized rebores require the PV’s themselves to be modded so more extra effort/money.) How large are we talking about before the power valves themselves need to be modified?? Tony Mine were at 1.75mm over and the power valves needed trimming at that so maybe 1.50mm is the limit for leaving the powervalves alone Thanks headcoats, mine are only at 1mm at the moment. |
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Paul H
Drag-strip hero
Posts: 244 
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Post by Paul H on Dec 11, 2017 13:50:50 GMT 1
There is a lot of talk about bore size and life left, i never understood this as i had mine relined and back to standard in one easy swoop
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Post by rd350rob on Dec 11, 2017 14:12:07 GMT 1
There is a lot of talk about bore size and life left, i never understood this as i had mine relined and back to standard in one easy swoop Where did you get them re-lined, and how much was it? I've got a set that are maxed out, and this would be great if it's not too expensive......
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Post by jon on Dec 11, 2017 19:30:15 GMT 1
There is a lot of talk about bore size and life left, i never understood this as i had mine relined and back to standard in one easy swoop Paul, the simple fact of the matter is that a rebore is cheaper than a reliner job, so therefore the barrels should reflect this price wise. I know it’s possible, but not 100% as the factory made them. OEM barrels are not liners pressed in. The ‘liners’ don’t have parallel sides so the alumninium must be cast around them. I’ve always wondered if YPVS barrels can be re-lined with say +4mm liners in them? Are oversize 68mm pistons available? Would you have to modify the powervalves too much? Would make for an awesome big bore of say 421 with a +4 crank as well. Jon |
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Post by Tobyjugs on Dec 11, 2017 20:26:08 GMT 1
There is a lot of talk about bore size and life left, i never understood this as i had mine relined and back to standard in one easy swoop Paul, the simple fact of the matter is that a rebore is cheaper than a reliner job, so therefore the barrels should reflect this price wise. I know it’s possible, but not 100% as the factory made them. OEM barrels are not liners pressed in. The ‘liners’ don’t have parallel sides so the alumninium must be cast around them. I’ve always wondered if YPVS barrels can be re-lined with say +4mm liners in them? Are oversize 68mm pistons available? Would you have to modify the powervalves too much? Would make for an awesome big bore of say 421 with a +4 crank as well. Jon Hi Jon i have such an engine so the answers are a bit like this "I’ve always wondered if YPVS barrels can be re-lined with say +4mm liners in them?" Yes "Are oversize 68mm pistons available?" Yes i'm now on 68.25 mm "Would you have to modify the powervalves too much?" Major Major surgery for this, my power valves are pinned open. "Would make for an awesome big bore of say 421 with a +4 crank as well." No not at all, at 400cc its making just over 70 BHP (good smooth power delivery). The biggest problem is the bigger liner cuts down on the space or volume needed for the transfer ports. Better just to use standard size pistons and a longer crank in my opinion. |
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Post by jon on Dec 11, 2017 22:24:34 GMT 1
Paul, the simple fact of the matter is that a rebore is cheaper than a reliner job, so therefore the barrels should reflect this price wise. I know it’s possible, but not 100% as the factory made them. OEM barrels are not liners pressed in. The ‘liners’ don’t have parallel sides so the alumninium must be cast around them. I’ve always wondered if YPVS barrels can be re-lined with say +4mm liners in them? Are oversize 68mm pistons available? Would you have to modify the powervalves too much? Would make for an awesome big bore of say 421 with a +4 crank as well. Jon Hi Jon i have such an engine so the answers are a bit like this "I’ve always wondered if YPVS barrels can be re-lined with say +4mm liners in them?" Yes "Are oversize 68mm pistons available?" Yes i'm now on 68.25 mm "Would you have to modify the powervalves too much?" Major Major surgery for this, my power valves are pinned open. "Would make for an awesome big bore of say 421 with a +4 crank as well." No not at all, at 400cc its making just over 70 BHP (good smooth power delivery). The biggest problem is the bigger liner cuts down on the space or volume needed for the transfer ports. Better just to use standard size pistons and a longer crank in my opinion. Tobyjugs, my questioning for the modified OEM YPVS cylinders is for the power all the way through the rev range. Sure a 421 or above (without YPVS) is going to have enough power before the powerband to pull strongly. Your 70HP figure is very good, but is it a linear power delivery? I expect not? A YPVS with 70+ HP and the bottom end would be great. Jon |
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Post by Tobyjugs on Dec 11, 2017 22:47:45 GMT 1
Hi Jon i have such an engine so the answers are a bit like this "I’ve always wondered if YPVS barrels can be re-lined with say +4mm liners in them?" Yes "Are oversize 68mm pistons available?" Yes i'm now on 68.25 mm "Would you have to modify the powervalves too much?" Major Major surgery for this, my power valves are pinned open. "Would make for an awesome big bore of say 421 with a +4 crank as well." No not at all, at 400cc its making just over 70 BHP (good smooth power delivery). The biggest problem is the bigger liner cuts down on the space or volume needed for the transfer ports. Better just to use standard size pistons and a longer crank in my opinion. Tobyjugs, my questioning for the modified OEM YPVS cylinders is for the power all the way through the rev range. Sure a 421 or above (without YPVS) is going to have enough power before the powerband to pull strongly. Your 70HP figure is very good, but is it a linear power delivery? I expect not? A YPVS with 70+ HP and the bottom end would be great. Jon It feels very smooth compared to my 4LO bike. Sorry Mr Kipling for hijacking your thread. |
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