VHB setup

The exact same passage blocked in both carbs? Not so very likely. Try another set of carbs. I have seen square slide bikes with the slides in the wrong way around, cutaway towards the engine, the bike being ridden and running pretty rich down low, but Paul knows them too well for that.
 
Tippie said:
The exact same passage blocked in both carbs? Not so very likely. Try another set of carbs. I have seen square slide bikes with the slides in the wrong way around, cutaway towards the engine, the bike being ridden and running pretty rich down low, but Paul knows them too well for that.
Click to expand...

Quite some feat getting the slides in back to front if you know how the cables attach to them and how the springs seat.

Paul
 
I am with you there Paul, I no longer work on other peoples bikes, and haven't done for a couple of years, but more recently I have stopped working on other peoples bike parts as well, that includes welding, it was a good move!
CLEM
 
Lothar wins.

I've had a lot of problems with those carbs. Several ultra sonic baths to get a semblance of function and when I renewed the brassware, a persistent bad stutter if the revs were maintained around 2000.
It turns out that I'd had the wrong needles in there.

Out and about on the bike this weekend and twice when pushing the nail down to switch on, no juice. First time, after checking the fuses, I opened the headlight and juice returned without explanation. Second time, pushing the nail in several times got the juice flowing.

I'm guilty, it was a right mess in that headlight. Domino connections and old wires.
I had a look yesterday and found that the main feed from the battery was loose in a domino which had partially melted due to arcing.
All is now cleaned up with proper connections.

A 60km ride this afternoon confirmed that everything is ok.
The engine isn't very happy under about 2500 and then picks up very nicely. I attribute that to the 4S cam which is pretty peaky.

So, a very nice bike.
The front brake is bedding in nicely though I may skim the shoes yet.
Gear selection is a bit hit and miss going up into 4th. Will sort that when the cover comes off to put a DAM lever in.
Lastly, I left that bike totally original right down to the steel clutch basket which gets hot and flustered rendering neutral hard to select.
Will change that when I need to get into the primary side.

Paul
 
Paul Marx said:
Lothar wins.

I've had a lot of problems with those carbs. Several ultra sonic baths to get a semblance of function and when I renewed the brassware, a persistent bad stutter if the revs were maintained around 2000.
It turns out that I'd had the wrong needles in there.

Out and about on the bike this weekend and twice when pushing the nail down to switch on, no juice. First time, after checking the fuses, I opened the headlight and juice returned without explanation. Second time, pushing the nail in several times got the juice flowing.

I'm guilty, it was a right mess in that headlight. Domino connections and old wires.
I had a look yesterday and found that the main feed from the battery was loose in a domino which had partially melted due to arcing.
All is now cleaned up with proper connections.

A 60km ride this afternoon confirmed that everything is ok.
The engine isn't very happy under about 2500 and then picks up very nicely. I attribute that to the 4S cam which is pretty peaky.

So, a very nice bike.
The front brake is bedding in nicely though I may skim the shoes yet.
Gear selection is a bit hit and miss going up into 4th. Will sort that when the cover comes off to put a DAM lever in.
Lastly, I left that bike totally original right down to the steel clutch basket which gets hot and flustered rendering neutral hard to select.
Will change that when I need to get into the primary side.

Paul
Click to expand...

So what was the problem......?
and what did lothar win ? Seems Lothar covered a lot of issues.  :-\
 
hooksey said:
So what was the problem......?
and what did lothar win ? Seems Lothar covered a lot of issues.  :-\
Click to expand...

Lothar said that electrical problems often looked like carb problems.
He wins a free entry to next years Amicale 750 Laverda meeting.

Paul
 
Paul Marx said:
Lothar said that electrical problems often looked like carb problems.
He wins a free entry to next years Amicale 750 Laverda meeting.

Paul
Click to expand...

Thanks, Paul. Glad I finally was of help at least for one person since I joined 20 years or so ago  8)
 
hooksey said:
So what was the problem......?
and what did lothar win ? Seems Lothar covered a lot of issues.  :-\
Click to expand...

well - to my defence (not that I feel I have to...  :D): it was my first answer on this thread; had it been checked, we would have missed 3 pages of entertainingly searching for other faults...

My other Posts were only posted as Paul did not check what I recommended at that time and described other symptoms, which led into the wrong corner of the labyrinth...

Anyway - Bike is running, problem is solved, Paul is happy - that are the key points.    :-*

(oh - and thanks for saying I COVERD a lot of issues, instead of I would HAVE a lot of them (joker) :LOL:)
 
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