Laverda 750 SFC 1974 replica

I think the missing hole could be for a locating dowel to accurately position the pump so it drives nicely.
If not a pressure relief valve?

Anyway! I'll think you will find they are not problems - they are opportunities!

 
Hi Luka,

The missing hole is as Simon says, a dowel hole, this can't be added by the producer as it would need to be made with the matching other half (your engine) so just fit the pump and make sure you can easilly spin the pump with your fingers. If not then loosen it off and try again.

Regards,
Julian
 
next thing is bronze bush for clutch basket. I noticed that there is no oil scroll in new bush. is this ok or i need to make a scroll ?
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You need to cut a scroll into the bush ..... and ream the bush to size

Here's a photo that more clearly shows the marking on the crank - Tom Eatman's post said
Usually, not always, there is an "0" stamped on the oil pump drive gear located on the crank. This should be at the slot on the crank.
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What is dowel hole ?? hole to insert pin so that part is position correctly ??

Because in the old pump that hole is not blind there is small hole drilled across the pump i marked it with orange line.
dsc0123.jpg

also in engine block that hole is not blind it is connected with one of oil pump holes
 
There should be a hole in the engine block to line up with the pump body hole, a pin or dowel is inserted right through to keep it all accurately lined up. Although the hole in the engine block should be blind.

As Julian has said you can do without the dowel if you tighten up quite strongly when the new pump is in the right place. The pump should then stay where it is put.

These are Dowels:

800px-Steel-Dowel-Pins.jpg
 
This isn't dowel hole for sure because neither of holes are blind and they are different sizes. To me it looks like overflow hole or maybe nozzle to oil chain that connects crankshaft and clutch ?
 
Hi Luka - I've got a 10mm pump and it's got the extra hole in the same place as yours - but there's a small cross drilling into it that goes to the front of pump -  not sure what use it is as it's not connected to any oil supply. Never seen any dowelled 750 pumps - but that's possible.  - regards - Phil

 

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Phil this hole is connected trough engine block .  If you look on engine block where pump is you see three holes two holes for oil pump and upper hole that is connected wit that missing hole in oil pump. 

So i tried to blow with air into this holes and bottom oil pump hole is connected with that upper hole.

I know i'm complicating but don't know what to do ?
 
So you are saying that this mystery 'upper' hole is connected to the pump 'lower' hole - perhaps a diversion for primary chain lubrication with a jet of oil?

Yeah, probably time to talk to this Andy Wagner chappy.
 
  Hi Luka - you're right - was looking at pump the wrong way round!! - have looked at a pair of crankcases and the extra (small) hole is just for extra oil to the primary drive - not really needed IMHO - regards - Phil
 
I tried to contact Andy last week but they are closed till monday. So  conclusion is that this hole is for primary drive. Thanks .
 
To increase the oil circulation round this part of motor and get rid off a bit of a "dead" spot  - bore a hole (about 20mm ish) as in photo - sorry about photo quality! - regards - Phil
 

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So little update about my project.

I took the bike to moto officina so that they can fabricate exhaust system for me and fine tune the engine. After that i just need to put fairings on it and sort out registration papers. i just hope that i finish paperwork until 5.6.2016. On that date we have laverda meeting in Slovenia  here is more info. https://www.facebook.com/events/264791950533300/
 
phil37 said:
To increase the oil circulation round this part of motor and get rid off a bit of a "dead" spot  - bore a hole (about 20mm ish) as in photo - sorry about photo quality! - regards - Phil
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Do you really mean 20mm, Phil?! Or 2mm? And what is the purpose? To increase uptake of oil? Have never heard of this upgrade mod.

Luka, so good to hear that your bike is nearing completion - what a fantastic effort. Can't wait to see/hear it in pics and videaos
 
Piranha Brother 2 said:
Do you really mean 20mm, Phil?! Or 2mm? And what is the purpose? To increase uptake of oil? Have never heard of this upgrade mod.
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20mm, it's in the same spot as the triples, but theirs are a little higher than Phils marked position.
:o That just popped into my head from the bowels of my memory .......... I hope I'm right.  :-[
 
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