rgs/ corsa valve clearances

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Smiddy

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Good evening all
While servicing the RGS, I removed the carbs to replace the intake rubbers. Found the rubbers ID 32mm but Intake port is 36mm. Also found CR stamped on the front of the head on the cam chain casting. The cams are F1s & F1a.
Is this a corsa head?
 
Any difference in valve clearances between the standard RGS & Corsa?


Smiddy
 
Smiddy said:
Good evening all
While servicing the RGS, I removed the carbs to replace the intake rubbers. Found the rubbers ID 32mm but Intake port is 36mm. Also found CR stamped on the front of the head on the cam chain casting. The cams are F1s & F1a.
Is this a corsa head?
 
Any difference in valve clearances between the standard RGS & Corsa?


Smiddy
Click to expand...

great find! Now fit 36 mm intake and 36 mm carbs....!!
 
I'm on it Paul!!
Bagged myself some 32mm alloy stubs which are beefy enough to take out to 36mm, also got some 36mm Mikuni carbs off a triumph which I'm hoping will fit in just nicely.

Bought the bike as an RGS which I was told only had the corsa running gear & bodywork (badges) but while on the Isle of Man this year I heard a standard RGS with the same pipes go by & it sounded completely different, this got me thinking so I trawled the forum looking for clues to identify the engine. Now winter is here and the bike is being stripped for maintanence I thought I'd have a good look.
Chuffed or what!!
The bike is bloody quick I have to say!!!

smiddy  :D
 
Grant

http://www.laverdaforum.com/forum/index.php/topic,89686.msg273170.html#msg273170


Smiddy
 
Corsa wheels, Corsa calipers, Corsa head.
It doesn't have standard silencers so can't say if it had extra holes in the end of the silencers (plus part number stamped on the silencers) and doesn't have the standard full rattling floating discs.
If it has extra holes in the airbox and high comp pistons then it's a proper Corsa, or someone has gone to a LOT of trouble to make it one.
The head (and pistons) give it the oomph.
 
Grant
Air box has extra holes at the bottom. Discs, I replaced as the old standard floaters had about 6mm slop on them & looked completely done. I now have the hydraulic clutch parts bar the push rod which must be a different length from cable one. Pipes are Jota type in Stainless, part numbers are present on the downpipes.
Not going to lift the head to check pistons but I guess a compression test may reveal what's in there.
Someone in the past has gone to great pains to make it this way as I believe the corsa was not available in 83.
The forum has been a great soarce of information I have to say. Fantastic!!

Roll on Spring time

smiddy
 
I have a longer pushrod taken from a hydraulic clutch surplus to requirements.
What is the engine number, are you sure it's a 1983?
 
Frame number 1850. Crank case number blank but cases were replaced way back. I suspect the chain went through the cases which would explain the cable clutch cover, must have been catastrophic.
Just checked registration docs & it was first registered in May 84, Don't know why I thought 83 (Doh)

PM me with a price for pushrod Grant, I'll take it off your hands if your sure it's spare.Thanks. I'm in NE Scotland

smiddy
 
Smiddy said:
Frame number 1850 ... & it was first registered in May 84
Click to expand...

Curious ...

1) That frame number is outside any of the known Corsa production runs, the earliest of which starts with 2351 and goes on till (at least) 2380.
2) And 1850 makes it a 1983 bike.

Have a look at the register on J-L's site :

http://www.laverdamania.net/registre120.htm

Craig

 
Thanks for that Craig
Date of manufacture & date of registration are two very different things.
I know it's an oddball, it was made very clear to me when I bought it. My mate bought it from a shop across the road from Slaters. He rode it for a year then stuck it behind a shed for thirteen years till one day he happened to mention it's existence to me. I about fellover when I saw it. Bit of a state I have to say. Not very often you buy a Laverda 150 yards from your house!!! :D 

I spoke to Richard Slater not long after buying it when I ordered some parts, he remembers the bike but not its history. I was however told it was a RGS engine & frame. Looks like the only RGS part is the frame.

Don't care anyway, its a cracking bike with my mark on it. I have all the original bodywork which only takes a couple of hours to fit. 
Guess I should really register it.Yes?
Love it love it love it!!!!
 

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