Setup info for PVP 252 Motor
Last update 18-05-2022 Print in PDF
Important: Use only fuel supply system with, filter, vacuum pump, regulator & pressure gauge "click here"
Specification
Cylinder and Piston
Bore: 54,02 maximum 54,035,
Stroke: 54,5 mm |
Piston /Cylinder Clearance: minimum 0.05 mm. |
Mesure the squeeze with a 1 mm. solder wire
it have to be abot 0.7 mm.
You can change the squeeze by change the head insert, the no. on the insert de describes how deep the the insert go into the cylinder, for example 2.2 go 2.2 mm. down into the cylinder. If the cylinder have got new Nikasil, it is some time shorter after that, then check the Squeeze, it have to be minimum 0.65 mm. |
The motor is also approved with 113 mm. rod,
you can use together with piston there have part no. 393, 394, 395, 396
and 397, and you can start with a cylinder diameter of 54.0 mm. this
piston is cheaper, but this piston is 11 gram heavier than piston no. 3965
or 3975
The motor is also approved with 120 mm. rod, then you use a 5 mm. aluminum gasket under the cylinder, but it will only work good if you have the motor with the 2014 update, or if you have the motor model 2017 |
Ignition
Ignition unit: PVL | Ignition timing: 5.8 mm before T.D.C. | Spark plug: NGK B10EGP or NGK R7282-11 |
Spark plug connector for NGK B10EGP is: part no. 898 | Spark plug connector for NGK R7282 is: part no. 899 |
If you have problem with it burning a hole in the middle of the piston then reduce the ignition timing from 5.0 to 5.8 mm. before T.D.C. | I f you have problem with detonation then increase the volume of the combustion camber, or use fuel with higher octane. |
Rotary valve
Rotary valve timing | Opens: 51.4 mm. before T.D.C. | Closes: 28.8 mm. after T.D.C. |
Part no. 281, 282 or 283 |
Primary drive
clutch axle / rear crankshaft | Reduction | |
Primary reduction ratio: | 58 : 26 | 2.2308 |
Recommended gear box for following races tracks
standard 1, 2, 3, 4, option 5, 6 | Hockenheim, sprocket 24:31 Magny Cours, |
standard 3, 4, option 1, 2, 5, 6 | Dijon, sprocket 24:30 |
1: 12:31 3 and 4, standard 2, 5 and 6 option | Assen, sprocket 24:31 |
Gearbox
Standard | Reduction | Part number | Rotax number on gear | |
1 st. gear low | 32 : 12 | 2.6666 | 611 : 512 | 4949 . 467 |
1 st. gear medium | 31 : 12 | 2,5833 | 613 . 512 | 5904 : 467 |
1 st. gear high | 31 : 13 | 2.3846 | 615 : 514 | 4944 : 462 |
2 nd. gear low | 29 : 15 | 1,9333 | 621 : 523 | 4964 : 4950 |
2 nd. gear high | 28 : 15 | 1.8666 | 624 : 523 | 4080 : 4950 |
3 rd. gear | 22 : 14 | 1.5714 | 632 : 542 | 5924 : 5910 |
4 th. gear | 23 : 17 | 1.3529 | 642 : 542 | 5933 : 5910 |
5 th. gear | 22 : 18 | 1.2222 | 654 : 554 | 5954 : 5940 |
6 th. gear low | 23 : 20 | 1.15 | 663 : 564 | 5976 : 5966 |
6 th. gear high | 21 : 19 | 1.1052 | 666 : 566 | 5975 : 5965 |
Gear box oil | In primary drive | In gear box |
Castrol Syntrax 75-90 or ELF HTX 740 | 0.2 Liter | 0.4 Liter |
Important: Control the oil level in the gear box and primary drive before you start the races day, if the motor stand long time can some of the oil move from the gear box in to the primary drive, and then begin to pump oil out to the plastic bottle, because the level is to high in the primary drive. |
Recommended sprocket for motor and rear axle
Motor: 22 T. 23 T. 24 T. 25 T. & 26 T | Rear axle: 29 T. 30 T. 31 T. 32 T & 33 T. |
Chain
To not overload the chain use minimum 22 T. on the motor and minimum 29 T. on the rear axle, for front and rear sprocket together have minimum 52 T, so you not overhead the chain. | For lubrication of the chain, use:
Pro chain spray ( PN. 4024) |
Fuel supply system
Fuel pump | Fuel pressure | Pressure Regulator | Fuel Filter |
Mikuni pulse pump | 0.15 to 0.18 Bar. | Part no. 4010 | Part no. 4036 |
Torque for bolt and nuts
M6 | M7 | M8 | M18x1,5 | M22x1.5 |
10 Newton | 13 Newton | 20 Newton | 100 Newton | 100 Newton |
Plug screw | ||||
20 Newton |
Petrol (Gasoline) & Oil
Petrol:
|
Oil: 4% mixture
|
Carburetor : PVP 42 mm.
Jet needle | Needle jet | Main jet | Needle jet | Air screw | Needle valve |
K24 clip position 3 from top
Motor with update clip 2 from top |
DQ 270 | 210 to 220 on front and rear cylinder
Motor with update 215 to 220 |
120 with 44 pilot jet |
about 1.5 round out | 250 |
I will recommend you to change parts in the motor after this driving time.
Always Change oil then you open gear box or primary drive
After 750 km.
Description | Qty. | Part number |
Piston, piston pin, c-clips & piston
ring ( for 115 mm. and 120 mm. rod) then you use PVL Ignition
If you use RTD ignition, then will recoment you to change the piston after 500 km. it will begin to crack and it will be very expensive if the piston collapse. |
2 | 3965 or 3975 |
After 3 races weekends or 1500 Km.
Description | Qty. | Part number |
Main bearing | 4 | 860 |
Big end needle bearing in rods | 2 | 223 |
Oil seals between crankshaft and primary drive | 2 | 812 |
Oil seal behind water impeller or if there come water out from the drain | 1 | 806 |
Also change this after 6 races weekends or 3000 km.
Description | Qty. | Part number |
Rods, crankshaft pin | 2 | 226 or 228 and 227 |
Side washer | 4 | 222 |
Small end bearing for rod | 2 | 390 |
Bearing for end of crank shaft | 2 | 848 |
Oil seal behind ignition & inside oil seal with water pump | 2 | 806 |
Oil seal for clutch drum | 1 | 820 |
Bearing in gearbox 6304-C3 2-RS ø20/52x15 | 1 | 852 |
Bearing in gearbox 6203-C3 2-RS ø17/40x12 | 1 | 845 |
Bearing in gearbox 6203-C3 ø17/40x12 | 1 | 844 |
Bearing in gearbox 6205-C3 ø25/52x15 | 1 | 856 |
Oil seal on shift shaft | 1 | 802 |