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Post by earthman on Sept 16, 2017 22:59:07 GMT 1
For those of you who have ridden both, how would you describe the acceleration of the 250 compared to the 350? Is it noticeably that much slower??
Back in the eighties my mates and I all had 350's so I really don't know,.....anyone know of any official figures that were quoted at the time?
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Post by jon on Sept 17, 2017 10:23:23 GMT 1
I think the power from a 350 is around 47 whereas the 250 is 35.
I've driven both, and believe me they are night and day for me.
There's nothing actually wrong with the 250 except out of the power band it feels gutless and not really suited for keeping up with modern traffic. Once in the power band they are good. This leads you to ride everywhere in the power band. Now if that's your thing that's fine.
With a 350 it has enough power out of the band to potter along, and open it up when you want.
A YPVS engine is yet another similar step in that this is even more suitable for the road as it has even more low down power.
I totally understand why so many fit. YPVS engines to LC's.
Jon
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Post by Gitram on Sept 17, 2017 12:44:10 GMT 1
This is probably no help at all, but.. I had three running on the same day once.. a standard 250, a tuned 250 and a standard 350, going by the seat of the pants dyno the 350 and tuned 250 felt the same but the std 250 was a bit slower in acceleration. the 350 was torquier out of the power but the tuned 250 felt like it accelerated about the same when they both got going.. cant remember what the gearing was on any of them.. it was about 25 years ago.. but that might have made a difference.
I always preferred the 250's because you had to work them a bit harder.. marti
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Post by Bertie Wooster on Sept 17, 2017 12:48:37 GMT 1
Rode a mates 250 in the 80's having just got off my 350 the 250 felt it was running on one cylinder compered to my 350
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Post by earthman on Sept 17, 2017 12:59:12 GMT 1
Thanks very much chaps,....considering that I like to keep a vehicle in standard form and my style/way of riding now, I think that it's got to be the 350 then.
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Post by robin on Sept 17, 2017 13:31:02 GMT 1
I had a standard 250LC and was happy with it, until I put a 350 top end on it (and the other bits) over a weekend, there was no way I was going to put the 250 bits back on it after riding it as a 350!
Chalk and cheese... 350 it has to be.
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Post by earthman on Sept 17, 2017 13:37:07 GMT 1
I had a standard 250LC and was happy with it, until I put a 350 top end on it (and the other bits) over a weekend, there was no way I was going to put the 250 bits back on it after riding it as a 350! Chalk and cheese... 350 it has to be. That did cross my mind, the possibility of changing the pistons, barrel and head? Plus carbs?? I really can't remember, what are all the bits involved? |
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Post by Deleted on Sept 17, 2017 14:39:08 GMT 1
I had a standard 250LC and was happy with it, until I put a 350 top end on it (and the other bits) over a weekend, there was no way I was going to put the 250 bits back on it after riding it as a 350! Chalk and cheese... 350 it has to be. That did cross my mind, the possibility of changing the pistons, barrel and head? Plus carbs?? I really can't remember, what are all the bits involved? |
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Post by jon on Sept 17, 2017 18:30:12 GMT 1
Really the important parts are barrels and pistons, head and oil pump. Everything else is a 'nice'.
Re-jetted carbs are 'OK'.
Jon
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Post by earthman on Sept 17, 2017 18:53:08 GMT 1
That did cross my mind, the possibility of changing the pistons, barrel and head? Plus carbs?? I really can't remember, what are all the bits involved? Many thanks for that link, most informative.  |
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Post by reedpete on Sept 17, 2017 19:03:04 GMT 1
If you have to make one choice, then 350 it is but the 250 does have a distinct character of it's own, much sweater engine with less vibration due to the smaller pistons and does rev. So if you are fortunate to have both then you can appreciate the attributes of the 250 knowing that if it's just raw power you want the 350 is at hand.
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Post by earthman on Sept 17, 2017 19:07:33 GMT 1
If you have to make one choice, then 350 it is but the 250 does have a distinct character of it's own, much sweater engine with less vibration due to the smaller pistons and does rev. So if you are fortunate to have both then you can appreciate the attributes of the 250 knowing that if it's just raw power you want the 350 is at hand. Some good points you raised there, thanks. |
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Post by headcoats on Sept 17, 2017 19:54:08 GMT 1
My 350LC Hybrid with a YPVS 350 motor started life as a little 250 and it was shite, not for purists but the YPVS engine is the better road tool by far
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Post by bare on Sept 17, 2017 21:42:58 GMT 1
IF deciding to turn one's 250 into a 350 ?
It would be clever to fit a fresh/rebuilt crankshaft at the same time.
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Post by JonW on Sept 17, 2017 23:34:18 GMT 1
One of the Aussie Magazines back in the day tested the 2 back to back, I have it somewhere but the gist was that it was pretty obvious which they preferred.
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Post by wwwRD350LCnet on Sept 18, 2017 7:01:13 GMT 1
Hello Jon,
If you could scan this back to bacl test it would be great for my website !
Xavier
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Post by earthman on Sept 18, 2017 7:21:00 GMT 1
One of the Aussie Magazines back in the day tested the 2 back to back, I have it somewhere but the gist was that it was pretty obvious which they preferred. I'd like to see a scan of this article too. |
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Post by Tobyjugs on Sept 18, 2017 10:12:25 GMT 1
I am currently using a 250 and modified 392 engine. Just like reedpete said the 250 is a sweet engine that revs up nice. The other engine is stronger outside the power band and much better on the motorway.
When driving on the small twisty roads I find it difficult to keep up with the 250
because the other driver is faster and when the 250 is in the power band it flys along
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Post by bryan on Sept 18, 2017 15:19:05 GMT 1
A programmable Zeeltronic CDI (with a more advanced lowere Rev range timing curve like the YPVS curve and a Dyna high power coil will fill the bottom end/mid range on either cc bikes and makes a big difference.
Think I ran about 24deg of advance, like a different bike at lower revs out of powerband.
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Post by earthman on Sept 18, 2017 16:53:18 GMT 1
A programmable Zeeltronic CDI (with a more advanced lowere Rev range timing curve like the YPVS curve and a Dyna high power coil will fill the bottom end/mid range cc bikes and makes a big difference. Think I ran about 24deg of advance, like a different bike at lower revs out of powerband. That's interesting to know, how much does this CDI cost and was it straightforward to fit? |
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Post by bare on Sept 18, 2017 17:23:49 GMT 1
Norbo carries the units.
Bit of a PITA to fit to an LC though. Not a big deal but certainly not as easily fitted as on a Valvie.
These engines LC or valvie are not powerhouses below ~4000 . Real issue is that the Stock LC CDI has NO inbuilt ignition curve.
So the oem ignition setup is a compromise solution
Also retrofitting a Stator / rotor / cdi from a 31k will equal the inbuilt/default curve in a Zeel.
IF one compares the piston / bore sizes between a 250 and a 350 .. It's quite a striking size difference.
Think espresso cup for the 250.
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Post by arrow on Sept 18, 2017 19:00:05 GMT 1
That did cross my mind, the possibility of changing the pistons, barrel and head? Plus carbs?? I really can't remember, what are all the bits involved? Interesting that the link says you need to change the primary driven gear (clutch basket). Not heard of that before?? |
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Post by mikee on Sept 18, 2017 21:26:53 GMT 1
A tuned 250 is a very sweet bike to ride , but the 350's easier , can't go wrong with either
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Post by JonW on Sept 19, 2017 0:07:40 GMT 1
Bit of a PITA to fit to an LC though. Depends what you use but the VCDI-04 (IIRC) is a piggyback and fits easily into the LCs loom, I think its only 4 wires. I fitted one on mu 421 build and it was great. |
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Post by bryan on Sept 19, 2017 15:33:23 GMT 1
You also need to elongate two of the slots the bolts go in as you need to advance the back plate to at least what you max advance on curve is, think I had to go 10mm.
You can't use bolt by Pulsar coil.
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Post by JonW on Sept 20, 2017 0:28:18 GMT 1
Im surprised you got 10mm Bryan, with my LC electrics in the ypvs case I did this and it snagged one something so while i had a long slot I couldnt get that much actual movement. I was doing it for static timing when setting up the Zeel on my 421 which needed more than the 24ish deg the system had as its max originally.
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