Rob123
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Posts: 379
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Post by Rob123 on Aug 7, 2020 16:05:49 GMT 1
Ive had a quick search but can't find anything recent. Has anyone had any 250lc barrels re linered to 350cc-400cc recently or in the past.
Its a possible route im looking at going down just so I can hold on to my standard barrels And 250 barrels are a third of the price of 350's. I want to make a 60-70 hp lc engine basically but want keep my standard gear just incase 😉
Questions as follows : 1.Can the 250 head be machined to work also? 2.what pistons would I need for 200cc/400cc ? 3.who could carry out the work? 4.any issues in doing this to be aware of?
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Post by reedpete on Aug 7, 2020 16:40:02 GMT 1
Yes, you can have 250 barrels relined and modified for DT pistons on 66mm 1. Head can be modified too, modify for domes is best. 2. DT 3. Ron Farron and maybe PJME. 4. Ron Farron lead-time....
But cost wise, buying a set of already tuned 4L0 barrels Is still best option
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Post by veg on Aug 7, 2020 16:43:04 GMT 1
It will be 12 months minimal I would guess for Ron, he is well known consequently v v busy. Or you could get the 250 barrels bored but you will be looking circa 275cc or as Pete says buy a set of 350 barrels unfortunately there is no cheap solution that’s why 250 barrels are still so cheap. 👍
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Rob123
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Posts: 379
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Post by Rob123 on Aug 7, 2020 17:55:53 GMT 1
Ive just been reading old posts regarding rons conversion. I think it may seem like a cheaper option from the onset regarding cheap barrels but ad in the cost £500 plus to re sleeve plus porting cost 12 month wait it doesn't seem as appealing 😂. I will look for some 4l0 barrels I think. If anyone has any please get in touch Cheers Rob
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Post by tony2stroke on Aug 7, 2020 18:15:09 GMT 1
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Rob123
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Posts: 379
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Post by Rob123 on Aug 7, 2020 18:34:50 GMT 1
Yes ive seen them thanks 🙂. Does anyone have any thoughts on them? Positive/negative? They do look like something I'm after to be fair. How about re bores on them will there be much life in them an new piston choices. Cheers rob
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Post by veg on Aug 7, 2020 18:43:02 GMT 1
I would go for standard then get them tuned at least you know what you have. Those may or may not be what they say they are std bore 4l0 go for about £500 ish. I’d rather stick with std the go from there.
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Rob123
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Posts: 379
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Post by Rob123 on Aug 7, 2020 18:54:35 GMT 1
www.ebay.co.uk/itm/274411325900There's these that are on standard bore but looks to be a chip/crack near a port. I'd rather get some off someone on here to be fair.
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Post by Gitram on Aug 7, 2020 18:57:48 GMT 1
375's are good fun, mine was pretty torquey but they are overbored from 350 barrels which are worn out, so the liner is thin and there are fewer chances to rebore..
then again, you probably won't do megamiles in a year..
the price is a bit salty for me though, however if you cost in the price of a tune then might be ok, but i am out of touch with the cost of a 2nd hand top end.. probably 25 years plus since i last bought one..
marti
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Post by tony2stroke on Aug 7, 2020 21:34:56 GMT 1
Logic here is that if you can get some decent barrels for £500 (I wouldn't hold your breath waiting either) you still need pistons and a rebore to be safe and get correct clearances, another £200 and you have to run it in too, then you need a head and good ones go for £100 at least these days (unless you get lucky) then you want to tune them, depending on spec you want head work too, cost I don't know, so adding all this up, £800 for a good to go 375cc top end doesn't seem that bad to me, no waiting for rebore and tuners work. after all if they don't turn out to be as good as they look, you can simply open a case with ebay return them with prepaid label from ebay and get a refund.
Also listing says offers, make an offer if interested, you never know.
And NO they are not mine before anyone starts.
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Post by flames on Aug 7, 2020 21:42:07 GMT 1
Think they have been re listed several times. Seem to go down £50 each time. If you build the rest of your bike first, you could end up being paid to take em away.😁
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Post by veg on Aug 7, 2020 21:50:07 GMT 1
The last few top ends have gone for £5-600with heads on a std or +25 bore. Yes at £800 plus offers these maybe worth it but considering over size bores tuning etc are they worth it? If you start with a known quantity you know where you’re going these are far to unpredictable.
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Post by oldelsieboy on Aug 8, 2020 8:12:24 GMT 1
www.ebay.co.uk/itm/274411325900There's these that are on standard bore but looks to be a chip/crack near a port. I'd rather get some off someone on here to be fair. The seller is on here. OEB
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Post by veg on Aug 8, 2020 9:06:34 GMT 1
As Nigel says speak to him on here complete top end with head. The 375 is now ‘confirmed’ as a Stan Stephens race tuned top end. That could be a fairly extreme all or nothing top end. They don’t make for the easiest road bikes. It will need Ypvs reed blocks then you need to consider carbs pipes and ignition and it will need setting up on a dyno properly. Or start with a std set up get Dave to wave his magic and have a useable tractable fast road bike. Or get a pv lump the choices are endless the costs expensive but ultimately it comes down to what you want out of the bike.
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Post by flames on Aug 8, 2020 12:31:42 GMT 1
Am I right in thinking when the conversion is done it is on its final bore?
Wander how much of a difference there is between ss tuned 375 and ss tuned 350 barrels?
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Post by veg on Aug 8, 2020 12:49:27 GMT 1
I think it is but I’m sure someone will clarify. The difference would depend on the state of tune not trying to be funny, if they are of the same state I would guess the 375 may give you a touch more torque, however I think the barrels aren’t the same so it’s more over square on the 375 which would normally mean it would be revier by default. Owning a highly tuned motor I am getting different pipes so it brings the power down the Rev range and gives more torque mine is doing 50bhp at 9000 rpm then the real power comes in and the clutch can’t cope.
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Post by flames on Aug 8, 2020 12:54:02 GMT 1
50hp @9k and THEN the real power comes in? Jeez.....that sounds FUN. Does it rev harder than standard as well?
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Post by veg on Aug 8, 2020 13:10:16 GMT 1
Mines a Tz700 Top end with 34mm carbs ex Yamaha France pipes its fairly linear unfortunately its a newly built motor so i have to get a few more miles on it before it can go back and be dynoed properly with a proper set of pipes for the road.
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Post by flames on Aug 8, 2020 13:19:22 GMT 1
Ye I have read your thread on it. It is one of my faves. Fantastic spec.🖒🖒🖒
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Rob123
Thrash Merchant
Posts: 379
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Post by Rob123 on Aug 8, 2020 15:07:37 GMT 1
You got a link to your thread veg?
The more im looking into it there seems to be a lot more options regarding development/tuning of the ypvs motor.
Its funny how the cheetah cub barrels don't have power valves but seem to be a popular mod in the states anyways.
It is a shame there isn't as many bolt on parts being developed for the lc. I wonder if the cheetah cub has the same hit as the lc anyone know?
It appears the ypvs bottom end with big bore barrels is the most popular choice.
I don't want to spend money on something and regret it ie: lc barrels, porting,ignition pipes. If I could get a ypvs bottom end I could just keep my lc motor intact if ever come to sell. Then build up a ypvs big bore/cheetah along them lines. Decisions decisions.🙂🙃
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Post by veg on Aug 8, 2020 15:27:55 GMT 1
If you want ultimate power speak to Dave he can build you a 100bhp plus motor. The big bore motors though are too much imho for the std chassis and brakes the quicker the bike the sooner you’ll realise you need to make those changes. So then you’re into wider tyres bigger brakes better forks, shocks etc. If you want a fun bike stay semi standard get an Lc that puts out 50bhp reliably and enjoy the 40 yr old chassis for what it is. Wheelies and interesting handling with poor brakes 😁 If you want the ultimate get lightweight wheels decent forks with a rising rate rear end (not just an rgv conversion) wider modern 17in tyres A Ypvs bottom end big bore top end decent ignition decent pipes and 100 bhp plus oh and it’ll cost you at least 10 big ones.
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Post by tacky1 on Aug 8, 2020 15:58:23 GMT 1
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Post by jon on Aug 8, 2020 16:06:34 GMT 1
If you want ultimate power speak to Dave he can build you a 100bhp plus motor. The big bore motors though are too much imho for the std chassis and brakes the quicker the bike the sooner you’ll realise you need to make those changes. So then you’re into wider tyres bigger brakes better forks, shocks etc. If you want a fun bike stay semi standard get an Lc that puts out 50bhp reliably and enjoy the 40 yr old chassis for what it is. Wheelies and interesting handling with poor brakes 😁 If you want the ultimate get lightweight wheels decent forks with a rising rate rear end (not just an rgv conversion) wider modern 17in tyres A Ypvs bottom end big bore top end decent ignition decent pipes and 100 bhp plus oh and it’ll cost you at least 10 big ones. A very interesting and poinent discussion. I’ve been torn between std YPVS engines or something more powerful for years. In the past I’d have gone ‘balls out’ on any vehicle, but nowadays with so many speed cameras and traffic, it’s not practical. Still can’t keep the petrol head attitude in check though. In the process of buying parts for my next build, a tuned 385 YPVS with all the usual extras. Somewhere in between? Jon
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Post by oldbritguy on Aug 8, 2020 16:26:33 GMT 1
I have a set of 250 barrels and head at Fahron just now for conversion. Cost for the full lot will be less than getting my 350 barrels relined to standard 🤔 These will be going on a spare engine I am building so will be able to make a fair comparison with my standard 350 motor when they comeback. Downside is this might be a while yet.
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Rob123
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Posts: 379
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Post by Rob123 on Aug 8, 2020 16:55:34 GMT 1
Oldbritguy Are you saying the cost of getting the 250 barrels re lined/sleeved to 350cc is less than getting your 350 barrels re sleeved back to standard?
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Rob123
Thrash Merchant
Posts: 379
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Post by Rob123 on Aug 8, 2020 16:57:26 GMT 1
I'd have a blast on that in a lc frame 😁😂
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Post by veg on Aug 8, 2020 17:22:07 GMT 1
Rob can I ask have you already got an Lc? Or looking at getting one? If you have one have you ridden it yet? If you haven’t what experience do you have with an Lc? I’m only asking as the answer to these may help you decide what to do or help those trying to answer your questions. I hope that makes sense? 👍
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Post by oldbritguy on Aug 8, 2020 17:29:21 GMT 1
Oldbritguy Are you saying the cost of getting the 250 barrels re lined/sleeved to 350cc is less than getting your 350 barrels re sleeved back to standard? Yeah, that is correct I got a set of 350 barrels relined back to standard earlier this year and it cost just under £600 from PJME. Absolutely top job, standard porting and provided with Japanese Mitaka pistons. 250 barrels are with Fahron just now for converting to 370. Going into the unknown here but have heard great things about this mon plus the quality of workmanship. Downside is the wait time. I spoke to Ron at Fahron last week and he is snowed under with work. He always is as he does loads of work for the racing scene. Says he should have retired years ago lol 😆 Anyway, looking at a 12 week turnaround whereas PJME will be a lot quicker. Also as the 370 is a little different from the std 350 I am expecting a bit of R&D in setting it up on the bike. Cost of the 370 will be just under £500 so there is a comparison.
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Post by bare on Aug 8, 2020 17:44:26 GMT 1
Efff me ! 600 ~ 800 for a set of decent 350 lc cyls (and a head()?. I have at least a couple of serviceable pairs/sets. One set on 2nd ? overbore other on it's 3rd ? Not sure TBH ...but definitely serviceable /unmolested. Otherwise I wouldn't have kept them. Will consider selling at those prices. besides I'm never going to use them. But then aren't UK ers additionally Reamed by the Tax collectors.. ? Under the pretense of Protecting long gone industry.
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Rob123
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Posts: 379
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Post by Rob123 on Aug 8, 2020 17:58:41 GMT 1
Answer to veg: I bought this 1982 350lc Canadian import a few months back,the guy I bought it from imported it in 2017 but never did anything to it. I recommissioned it and have got it running very well. I dont think it had done many miles since a rebuild. Although there a couple of issues that had to be sorted. I had it on the dyno at a'js vapour blasting in Hull Just down the next street to me just to check it was running safe and out of curiosity if it had been ported. Results came in that it was running lean almost everywhere and gave 46.9 bhp. Since then I've been pondering what to do next. Ive put around 500 miles on it since I've got it. Ive got to say I didn't expect it to only have 46bhp when we dynoed it. I was sure it must of been ported, the power delivery is addictive and feels a lot quicker then it actually is im hooked 😄 I have always been into improving/tuning/tinkering with engines just in my blood i think 😂
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