vitjakes
Just got it firing!
Good day, fellow riders,
I have just recently become a Moto Guzzi owner as I got myself a well-used '84 SP2 with 162 000 km on it. Despite the milage, it looks nice and original, doesn't sound terrible and it's got 150 psi of compression on both cylinders and it even seems to charge, albeit only at 13 V (checked the AC feeds, all off them put out 40 V, had a spare regulator, tried it, no change, but I'll cross that bridge when I get there.).
To begin with, the bike came equipped with some kind of a home-made Volkswagen pointless ignition unit from a MK2 Golf. It seemed to work fine, but I got the original points plate with it so I retrofitted them to know what I'm dealing with. But prior to this swap, I carefully set the valve clearances to spec and then went through the lean-burn PHF36 BS carbs (probably from a LM3), which were absolutely flawless, including all o-rings. The only thing I noticed that was off was the float height, which I carefully adjusted to 18 mm with the carb resting on the intake as per the DellOrto manual.
I then tried and started the bike just about fine, bled the accelerator pumps, it rides and reacts to throttle promptly, basically no issues there. So then I thought I'd try and balance the idle and slides by ear and sight. I set the mixture screw to highest idle on both cylinders and started fidling with the throttle screw. All went well until I got to a point where I just can't get the idle any lower than 1200 RPM. When I twist the screw further out, the idle seems to pick up as it probably starts sucking air through the screw as there is not enough spring pressure to keep the o-ring sealing. If I physically reach inside the carburettors, I can feel a palpable wiggle of the slide as it's pretty worn out. Could this be the reason I can't get the iconic low idle? I'm doing all of this at operating temperature without the airbox fitted.
And now to the points. I tried my best to find the static timing and full advance marks on my flywheel. While turning the fllywheel anticlockwise and waiting for the marks for the right cylinder, at first I can see an unmarked line, followed by another one and then two lines with the letter "D" under them. If I understand the manual correctly, the first line is the full advance, the second one is for static timing and the "D" is TDC right cylinder. The trouble, however, comes with the left cylinder, where I can only see one line, followed by S. How the hell am I supposed to time it with a strobe? If anyone could chime in with a tip, I'd be incredibly grateful.
I have just recently become a Moto Guzzi owner as I got myself a well-used '84 SP2 with 162 000 km on it. Despite the milage, it looks nice and original, doesn't sound terrible and it's got 150 psi of compression on both cylinders and it even seems to charge, albeit only at 13 V (checked the AC feeds, all off them put out 40 V, had a spare regulator, tried it, no change, but I'll cross that bridge when I get there.).
To begin with, the bike came equipped with some kind of a home-made Volkswagen pointless ignition unit from a MK2 Golf. It seemed to work fine, but I got the original points plate with it so I retrofitted them to know what I'm dealing with. But prior to this swap, I carefully set the valve clearances to spec and then went through the lean-burn PHF36 BS carbs (probably from a LM3), which were absolutely flawless, including all o-rings. The only thing I noticed that was off was the float height, which I carefully adjusted to 18 mm with the carb resting on the intake as per the DellOrto manual.
I then tried and started the bike just about fine, bled the accelerator pumps, it rides and reacts to throttle promptly, basically no issues there. So then I thought I'd try and balance the idle and slides by ear and sight. I set the mixture screw to highest idle on both cylinders and started fidling with the throttle screw. All went well until I got to a point where I just can't get the idle any lower than 1200 RPM. When I twist the screw further out, the idle seems to pick up as it probably starts sucking air through the screw as there is not enough spring pressure to keep the o-ring sealing. If I physically reach inside the carburettors, I can feel a palpable wiggle of the slide as it's pretty worn out. Could this be the reason I can't get the iconic low idle? I'm doing all of this at operating temperature without the airbox fitted.
And now to the points. I tried my best to find the static timing and full advance marks on my flywheel. While turning the fllywheel anticlockwise and waiting for the marks for the right cylinder, at first I can see an unmarked line, followed by another one and then two lines with the letter "D" under them. If I understand the manual correctly, the first line is the full advance, the second one is for static timing and the "D" is TDC right cylinder. The trouble, however, comes with the left cylinder, where I can only see one line, followed by S. How the hell am I supposed to time it with a strobe? If anyone could chime in with a tip, I'd be incredibly grateful.