Lambretta GP 200 Geniune SIL engine

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Lambretta GP 200 Geniune SIL engine

Postby Joene » 23 Sep 2009 15:20

Does anyone here has experience with a Lambretta GP 200 Geniune SIL engine ? Pro - Contra ?
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Postby irish john » 23 Sep 2009 17:49

Pro!
some mods needed if you are going to tune it.
Replacing the crank is advised if you are too impatient to run it in properly (1500klms)
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Postby Joene » 24 Sep 2009 09:24

John, if I decide to put a MUGELLO 200cc V3.0 as replacement for a worn out 200 cc cylinder with the existing SH 20-22 carb and standard exhaust, would you still recommend replacing the crank ?
i have no intention to tune the engine however keep it more or less standard, thus reliable.
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Postby irish john » 24 Sep 2009 09:57

Yes, the indian crank is only just good enough for standard, and some of the engines for sale in europe are not genuine SIL, these really need the cranks and everything else changed.
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Postby Joene » 24 Sep 2009 11:26

Is that a job (replacing the crank) I could ask Lambrettafinder to do?
I mean, you need special tools to do so, I believe ?
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Postby irish john » 24 Sep 2009 12:19

You need to change the flywheel side bearings aswell, plus the oil seals. And while the engine is open change the chain, clutch plates and springs too.
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Postby Joene » 24 Sep 2009 12:24

but if it is a real genuine SIL engine, do I really need to change all that ??? (flywheel side bearings, oil seals, chain, clutch plates and springs)
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Postby irish john » 24 Sep 2009 12:44

If you are going to tune it, Yes.
and can you PLEASE post technical questions in the "technical" section from now on?
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Postby irish john » 24 Sep 2009 12:45

one question, why is the cylinder worn out if its a new SIL motor?
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Postby Joene » 24 Sep 2009 15:05

John, thank you for your feed-back [:)]
it became a technical story as you started with changing bearingsn, etc... [;)]
@ all others: would also appreciate your opinion on pro - contra

It is a complete new engine though, what I meant earlier with a worn out was as an example. It actually has the stage 4 GP200 cylinder, piston and cylinder head, GP200 gear box, GP200 clutch sprocket, drive sprocket, chain etc.

I just don't like ironcast cylinders anymore [V]
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