How To Measure a 2 Stroke Engine - 100 mph Moped Challenge

Today I have a full remeasure of the engine so we have an accurate record of where we are before more modifications.

Patrick Garage's TZR250 project can be found here:    / @patricks_projects  

Engine Specs:
Bore 54.5 mm
Stroke 41.6 mm
Conrod length 80 mm
Cylinder Volume 97 cc
Conrod length 80 mm
Squish Clearance 0.45 mm
Squish Area Ratio 0.5
Trapped Volume at TDC 7.6 cc
Geometric Comp Ratio 13.8:1
Trapped Comp Ratio 7:1

Exhaust Duration 201.9 Deg
Transfer A Duration 129.6 Deg
Transfer B Duration 126.8 Deg
Transfer C Duration 128.9 Deg

Carb KX 80 PE V502CH06
Bore 28mm
Main Jet 130
Pilot Jet 55
Needle N99A

Exhaust Dimensions mm
Section Dia Section length
30
30 14
33 85
38.5 94
51.5 85
68.5 75
98.5 100
100 80
95 21.6
76.5 43
19.8 108

Ignition Timing
RPM Degrees
2000 15
3000 18
4000 20
5000 22
6000 23
7000 23.5
8000 24
9000 23
10000 22
11000 20
12000 18
13000 11


2 Stroke Stuffing shows how he measures here: E8 - HOW To: Portmaps, Port Durations, And Port Angles. 2STROKE STUFFING
   • E8 - HOW TO: Portmaps, Port Durations...  


5:52 measuring squish