Total restoration 4l0 model three strips

[roby267]

Hi guys,
I am a new member of this forum that other friends, smoky, advised me to follow in order to find excellent advice and solutions for the restoration of my bike.
As I said above, a few months ago I bought a blue candy 4l0, which I will make white, it has been standing still for about 10 years, so it will be completely disassembled and revised.
I opened the engine, 20,000km, it has the original 64mm pistons that I will have to change and I would like to take dedicated pistons and not those of the RD YPVS which, from what I have read, must be worked in the lower part of the mantle. I was thinking of Mitaka, which have a good value for money and if you are lucky you can get them Prox marked. In addition to Yambits, in Europe, do you know where I can buy them? I would have found, available at a good price, some +1.65mm Mitaka, but many tell me to go from 64mm to 65mm, what do you think? With the engine fully open, is there any improvement I can do, like lowering the cylinder head a bit? On the other RD YPVS model 2UA, I did it because it was recommended, but I don't know anything about this model. I bought the original cylinder head gasket, it is very thick, but I didn't trust the commercial gasket.
They also told me to put the reeds, reed packs, of the 31K, cut you about 10cm of the muffler silencer and to do something, which I did not understand, to the carburetors. Then we would rotate the stator three degrees less.
I have original reed packs of the YPVS model, can I put them on the 4l0? I had replaced them with the Vforce4 and so I am left with the old originals.
Thanks to all, I trust in your help

[Hooligan]

YPVS reeds do not fit 4L0 cylinders

[roby267]

OK thanks. Can i modify my reeds?

[JonW]

it is said that 250 RZ reed blocks will, if so ive fitted YZ85 VF3s to a 250 RZ here.

[roby267]

So alternatively I could put those of the RD 250 and YZ85, VForce 3.
I state that I bought the original VForce4s for my YPVS, but have any of you ever tried the Chinese VForce? They say they are well made, the same as the originals (probably the Chinese in addition to making them for the VForce also make them a bit for them) the only problem, which is not a small one, is the thickness of the petals.

[kpke]

"but many tell me to go from 64mm to 65mm"

This seems like a horrible waste of 64.25, 64.50, and 64.75 bores.

Surely there must be 64.25 pistons available. tacky1, are you out there to offer a recommendation for pistons?

[roby267]

The 65mm pistons, I would have them available here on site, while the 64.5mm ones, I would have to order them in the U.K.
Unfortunately with brexit shipments have very long shipping times, now you are subject to customs duties, about 30% -
To what extent can the cylinders of the RD-LC be ground, bored? An owner of an RDLC suggested me to put a fan on the radiator as the RD suffers a lot from the high temperatures which would cause the dilation of the cylinder bolts and therefore possible engine breakages; is it to you?

[Hooligan]

OK thanks. Can i modify my reeds?

No. YPVS reed cages are much wider than the LC units. Just flow the LC reed cages and add a good set of carbon reeds and that will work fine.

[Hooligan]

The 65mm pistons, I would have them available here on site, while the 64.5mm ones, I would have to order them in the U.K.
Unfortunately with brexit shipments have very long shipping times, now you are subject to customs duties, about 30% -
To what extent can the cylinders of the RD-LC be ground, bored? An owner of an RDLC suggested me to put a fan on the radiator as the RD suffers a lot from the high temperatures which would cause the dilation of the cylinder bolts and therefore possible engine breakages; is it to you?

I think you will find the LC engine to be VERY cold blooded. They take forever to warm up. The only time a fan would be of any benefit is if you are stuck in bumper to bumper traffic.

If you really need a fan, a cheap 120mm computer fan wired up to a handlebar switch would be the way to go. The entire setup can be purchased for under $20 and the switch allows the fan to be turned on only when it is actually needed. I use such a setup on a dirt bike and it has survived 4 years of dirt, mud and being power washed.

[tacky1]

I’ve never had a heating problem with an LC. quite the opposite even in traffic. The YPVS 350 or RZ350 is the opposite. Deffo need a fan in traffic on the west coast

[roby267]

I'll probably put a fan on for safety.
As for the engine. do you have any suggestions for me, is there any corrections to be made on the cylinder, cylinder head, carburetors etc. etc.

[JonW]

Hmm,Im not really sure where all this advice youre getting is coming from, but i reckon its not a dedicated forum like this one. hmm. Dont take this the wrong way and this is just my 2c but I think you should have a really good read on the builds on this and the RDLCCrazy website rather than go with one/some/many random guys advice. ie you dont need a fan, even in Australia where we have the odd hot day now and then. My 421 LC has a fan and a huge rad, but has massive USD forks, however it is very far from a 350LC.

FWIW You dont say where you live... and then suggest that you have to buy pistons from the UK, there is no brexit issue with pistons if bought locally etc.

[roby267]

Sorry Jon, you're right, I thought you could see my location from my profile, I live in Italy, Rome.
I have recommended your forum just because there is a lot of expertise, I too had never heard problems of breakage on the engine due to bolts that dilated with high temperatures.
Using the bike even in the city, it happens to be in traffic, so to avoid possible problems I will put a fan.
If I put 65mm pistons, I would have the possibility, in case of engine failure, to put bigger pistons and to what extent?
I read on your forum that it is possible to use YPVS / Banshee pistons, on the RDLC; having old pistons from a YPVS, replaced with a Namura kit, I saw that in addition to having the step at the end of the piston, they also have different openings on the piston skirt, in the YPVS they are more oval in shape, while on the LC they are more round in shape; doesn't all this create problems?

[Hooligan]

In my 35 years of owning an LC, I think I have had an overheating issue maybe once or twice. The thing you should be extremely careful about is running the engine too cold with a fan when one is not needed.

[roby267]

I will only run the fan when necessary, manual ignition.
Does the LC have no thermostat? I didn't find it on my bike, I looked at the engine's part list and it isn't there either.