LAVERDA 650/750 Prototype photos 1

I wonder what the fluid reservoir is for in the 4th photo. Lube system for the chain or swingarm? Great photos btw and in very good quality too!

Herman
 
Interesting carburoosters. Anyone know what thet are? And looks like a cam chain slipper at the front of the barrels. 6-fuse box (5 fitted). That battery must have weighed around 25kg!!
 
piranha-bro2 said:
Interesting carburoosters. Anyone know what thet are? And looks like a cam chain slipper at the front of the barrels. 6-fuse box (5 fitted). That battery must have weighed around 25kg!!
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As Gert stated, Dellorto SSI. These were pretty much the italian equivalent to Amal TT/GP and being sport/race instruments, were just as fickle to set up and maintain. The appearance of the VHB shortly after was a great improvement for road use.

Lube set-up looks like an end-feed to the crank, no visible oil slingers! Or just a seperate out-rigger support? Might be just how the rods were held in place for the photo, ie, left rod angled backwards, but crank phasing seems it might be 180°! Interesting is the use of ball bearings throughout, even for the inner mains. The pitch of the timing chain looks a bit smaller than the production item.

I quite like the cosmetics of the early engine, it has a very artsy look to it, especially concerning the placement of the logos. The speedo/tach integration in the headlight shell is absolutely svelte. Guess a lot of that fell victim to cost-cutting and easier production.

Any pics of the gear selection mechanism Gert?

Yeah, monster battery, straight out of the harvester..? ;)

piet
 
sfcpiet said:
As Gert stated, Dellorto SSI. These were pretty much the italian equivalent to Amal TT/GP and being sport/race instruments, were just as fickle to set up and maintain. The appearance of the VHB shortly after was a great improvement for road use.

Lube set-up looks like an end-feed to the crank, no visible oil slingers! Or just a seperate out-rigger support? Might be just how the rods were held in place for the photo, ie, left rod angled backwards, but crank phasing seems it might be 180°! Interesting is the use of ball bearings throughout, even for the inner mains. The pitch of the timing chain looks a bit smaller than the production item.

I quite like the cosmetics of the early engine, it has a very artsy look to it, especially concerning the placement of the logos. The speedo/tach integration in the headlight shell is absolutely svelte. Guess a lot of that fell victim to cost-cutting and easier production.

Any pics of the gear selection mechanism Gert?

Yeah, monster battery, straight out of the harvester..? ;)

piet
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I ran a SS1 on my Jawa 2-valve speedway bike in the late 70’s. It had two remote fuel bowls one either side of the carb body. It had a bad drink problem!
 
triton said:
I ran a SS1 on my Jawa 2-valve speedway bike in the late 70’s. It had two remote fuel bowls one either side of the carb body. It had a bad drink problem!
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Yeah, the big problem with these type of carbs was that lean angles would drastically influence float height and therefore mixture because the float bowl was so far off-centre. Most sidecar outfits used dual float bowls to counter the centrifugal shift of fuel in the bowls as well. Concentric types such as the VHB and PHB/F/M cured most of those problems.

I had a 1 3/8" GP on my Matchless, it suffered badly from this syndrome on the road and from the fact that it didn't have a proper idle circuit. Replaced with a rare spanish 32mm Monobloc, sacrifices a few ponies but much better.

The Jawa probably had close to a #1000 main jet, they needed the fuel for internal cooling... Running CR of 13:1 and more, speedway engines always ran on the verge of self-destruction imho. ;)

piet
 
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