Need new pistons for your 4L0 RDLC ?

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L.B
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Re: Need new pistons for your 4L0 RDLC ?

#16 Post by L.B » Tue Jan 20, 2015 9:21 pm

How .uch meat on the 250 barrels Jon?

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JonW
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Re: Need new pistons for your 4L0 RDLC ?

#17 Post by JonW » Tue Jan 20, 2015 9:57 pm

Never thought of that, I assume the same, ie 2.5 over. I was idly looking at my '65.5 and needing a rebore 350 cyls' and wondering if that would be a smarter route for my cash...
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jimrd
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Re: Need new pistons for your 4L0 RDLC ?

#18 Post by jimrd » Mon Apr 20, 2015 12:27 pm

this is exactly happened to my LC a few years go

I was busy so I got a proper bike mechanic shop to supply and install the pistons


they did not take the tab off

So the bike grenade in 300 km

of course they played ignorant

Jim
1964 Austin Cooper S 1071cc
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1981 RD350LC , R1 Front,toomey pipes, Barnet Clutch, ported , PJ carbs, R1 Speedo 01
1983 RZ 350 - stroker bike,R6 rear shock,tapered stem bearings,progressive springs,

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OldTZracer
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Re: Need new pistons for your 4L0 RDLC ?

#19 Post by OldTZracer » Sat Jan 23, 2016 3:44 am

Anyone ever take the time to compare the weights of the various Pistons & rings? I suspect the forged ones are a little heavier but curious by how much.
"...its a 2-stroke ya twit - Its supposed to smoke..."

Zombie
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Re: Need new pistons for your 4L0 RDLC ?

#20 Post by Zombie » Sun Feb 05, 2017 9:44 pm

Why not run Wiseco forged pistons?

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2smoke
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Re: Need new pistons for your 4L0 RDLC ?

#21 Post by 2smoke » Mon Feb 06, 2017 12:23 am

Zombie wrote:Why not run Wiseco forged pistons?
Some people do. But in my opinion they are overkill for a 40-50-ish horsepower bike.
Yes, they are heavier too. And more expensive.
Easy to get though, wiseco is often the choice of shops because they can get a pair in an hour with a phone call.
I personally have nothing against using them other than the price.
Colin
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Re: Need new pistons for your 4L0 RDLC ?

#22 Post by Zombie » Sat Feb 11, 2017 11:05 pm

[/quote]Some people do. But in my opinion they are overkill for a 40-50-ish horsepower bike.[/quote]

I think they add a degree of safety for highly stressed applications and longevity for less stressed engines. Overkill for a 40-50hp bike? Not for a MX 125 turning 13,500rpm!

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Re: Need new pistons for your 4L0 RDLC ?

#23 Post by 2cycle » Tue Jun 19, 2018 9:38 am

One of my fuel petcock outlets plugged on my 350lc and as a result a piston seized. Once the cylinder was cleaned up it appears to be ok. Just some visual marks that cleaned up after a cylinder hone. However the piston is toast. How do I replace the piston while making sure the piston to cylinder clearance is ok or do I need to bore next size over ?
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LC Cnd
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Re: Need new pistons for your 4L0 RDLC ?

#24 Post by LC Cnd » Sun Dec 23, 2018 8:24 pm

Has anyone had any luck with Wossner pistons compared to Vertex ones?
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Palolo
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Re: Need new pistons for your 4L0 RDLC ?

#25 Post by Palolo » Wed Dec 26, 2018 4:18 pm

I have Wossners on two Kawasaki H2 engines and I think they are great. Both engines have 3,000+ miles with zero piston rattle.

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Re: Need new pistons for your 4L0 RDLC ?

#26 Post by LC Cnd » Sat Dec 29, 2018 5:49 pm

Who did you purchase them from for the H2? Caliper measure inside and at the top end measured 64.19mm (odd) which probably means 64.25. Note Fast from the Past has 'em in stock for $100 US each. Interestingly, they look just like the Vertex ones I purchased.
http://www.fastfromthepast.com/98-8075d025

RuZty
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Re: Need new pistons for your 4L0 RDLC ?

#27 Post by RuZty » Sat Dec 29, 2018 8:11 pm

Wossners are sized for the bore, ie. a 64.5mm piston will fit correctly when the cylinder is bored to that size.

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nokturnal
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Re: Need new pistons for your 4L0 RDLC ?

#28 Post by nokturnal » Fri Jan 04, 2019 7:02 pm

Wossners are forged (like Wiseco), I believe Vertex are cast (like Pro-X),
:smt017

nzminis
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Re: Need new pistons for your 4L0 RDLC ?

#29 Post by nzminis » Sat Jan 05, 2019 6:11 am

vertex are cast
but are 12-21% silicon , really well known in the off road world ,

next rebuild i do on a 350 i will be using vertex , they are a really high quality piston
have mitaka (prox tkrj) in 6 bikes now and no problems they are a very good piston aswell

i would stay away from forged its not needed , just my opinion !!!!

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Need new pistons for your 4L0 RDLC ?

#30 Post by nokturnal » Sat Jan 05, 2019 8:01 am

Pretty sure vertex do or used to manufacture OEM ktm pistons
:smt017

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