Your ignition timing is extremely important for the proper functioning of your engine! If the timing is incorrect, your engine will not perform at its best, and if it is really incorrect, you risk a seizure.
To time an ignition you need at least one timing pin .
A piston lock would not be a bad idea to tighten and loosen the ignition.
You can also use a comparator and its tip allowing you to fix it in place of your spark plug.
How to time your ignition:
Once your measuring tool is in place, find the top dead center (TDC). This is the point where your needle will stop and then start moving in the opposite direction (down). Once you've found this point, lock your gauge or dial gauge at zero before lowering your piston to the desired value. (Be careful to go back to lower it, otherwise you risk having an incorrect setting.)
Once at the right value, degrease the tail of your crankshaft well to avoid future misalignment as much as possible. Then insert your rotor by aligning it with your stator. Finally, tighten it. To do this, we recommend putting 2 screws in the rotor to turn it more easily. Remove your timing tool and replace it with something to block your piston. Using the 2 screws, press your rotor firmly against your crankshaft so that both turn at the same time. Then block your crankshaft, tighten your nuts and check your timing.
Setting values:
PVL :
- Analog PVL: 1.0 to 1.4mm
- PVL KRD digital: 5.0 to 5.8mm
- PVL Stage 6:
Race 39.2-39.3mm:
80mm connecting rod: 3.20mm
Connecting rod 85mm: 3.17mm
90mm connecting rod: 3.13mm
43mm stroke:
80mm connecting rod: 3.57mm
Connecting rod 85mm: 3.53mm
90mm connecting rod: 3.49mm
44mm stroke:
80mm connecting rod: 3.68mm
Connecting rod 85mm: 3.63mm
90mm connecting rod: 3.59mm
45mm stroke:
80mm connecting rod: 3.78mm
85mm connecting rod: 3.73mm
90mm connecting rod: 3.69mm
- Pvl Bidalot factory:
stroke 39.2-40mm:
5.8 to 6.2mm
42mm stroke:
6.2 to 6.6mm
43mm stroke:
6.4 to 6.8mm
44mm stroke:
6.6 to 7.0mm
stroke 44.9mm:
6.8 to 7.2mm
- Pvl digital bidalot and conti (500 104,105 500 54): 5.6 to 6.4mm
- External digital PVL: 0.0mm
POLINI:
- Front induction: 1.4mm.
- pvl polini: 3.8 mm (3mm for wrp)
SELETRA:
Malossi:
- Malossi MHR Scooter: 2.25mm.
- Malossi MHR mécaboxes: 3.3mm.
Italkit:
- Analog iltakit: 1.2 to 1.7mm.
- Italkit digital curva: 0.0mm (align rotor/stator at TDC of the piston).
MVT:
- Digital Direct (DD)
RJ34-4: 1.5mm
RJ34-3: 0.35 mm
RJ34-7: 0.40mm
- MVT Millenium: key in housing A
- MVT Millenium + Digimax: key in housing D
- MVT Premium: 0mm (at TDC)
- MVT Premium + Digimax: 1.3 mm
- MVT gp (old model no longer sold) digital external rotor: 4.3mm
CONTI:
- CRX Neutrino: 6.0 to 7.0mm
HPI:
- digital: 3.7mm
stroke 45: 3.2mm
Doppler :
- analog: 1.5mm
- digital: 3.2mm
(credits: ltj_hugo)