Factory Data |
MX80 |
MX125 |
Notes |
IgnitionTiming |
1mm (.03937") |
1.3mm (.051") |
Kokusan |
Type Spark Plug |
NGK 5 K OHM |
NGK 5 K OHM |
resistor type |
Carburetor |
Mikuni TM 32 |
Keihin PWM 38 |
. |
Main Jet |
220 |
178 |
use 200 main jet with needles shown below |
Idle Jet |
25 |
55 |
. |
Idle Jet |
25 |
52 |
using racing octane |
Needle |
6DL1-61 |
N 1 EC |
125 use PGH (rich) or CEJ (lean) - clip in middle |
Needle position |
3 |
3 |
. |
Needle position |
3 |
2 |
using racing octane |
Valve |
3.5 |
6 |
(slide valve number) |
Idle Screw |
2 turns |
1 - 1.5 turns |
. |
Spark Plug |
BR9EG |
BR9EG |
. |
Gap |
0.7mm (.026") |
0.7mm (.026") |
. |
Piston Clearance |
0.06mm (.0024") |
0.06mm (.0024") |
Minimum clearance |
Deck Height |
0.75mm (.030") |
1.7mm (.070") |
Top of cylinder to top of piston at TDC |
Volume |
7.1cc |
11.0cc |
Combustion Chamber |
Squish |
0.9mm (.035") |
0.9mm (.035") |
Dimension between squish band to piston at TDC |
Clutch |
5/6 |
7/8 |
ferrous / friction - friction 1.5mm (.059") |
Transmission capacity |
.7 liter (.74 qt) |
.7 liter (.74 qt) |
. |
type oil |
ATFII |
ATFII |
Dexron, Mobil 1, Sunoco etc. |
Gas/Oil mixture |
3% |
3% |
2% using racing octanes |
. |
. |
. |
. |
Transmission |
Ratio |
. |
. |
1 |
14/32 |
. |
. |
2 |
16/28 |
. |
. |
3 |
18/27 |
. |
. |
4 |
20/25 |
. |
. |
5 |
22/24 |
. |
. |
6 |
23/22 |
. |
. |
. |
. |
. |
. |
Primary |
19/63 |
. |
. |
. |
. |
. |
. |
Please recognize that these specs are for motocross only application. |
. |
||
Metrics |
KV95 |
K9B |
MOTO |
Ignition Timing |
108> 1.2mm |
1.6mm |
1.0 - 1.2mm |
. |
100< .9 to 1.0 |
. |
. |
Combustion Chamber Volume |
11.8 - 12.0cc |
11cc |
10.0 - 11.0cc |
Exhaust Port Height |
std |
std |
33mm |
Piston to Bore Clearance |
.07-.75mm |
.07-.75mm |
.06-.065mm |
Maintenance |
KV95 |
K9B |
Moto |
Piston & ring |
20L |
30L |
30L |
Rod |
120L |
120L |
120L |
Crankshaft bearings |
60L |
60L |
60L |
Piston pin & bearing |
60 - 70L |
60 - 70L |
60 - 70L |
Rod bearing |
120L |
120L |
120L |