The following is basic break-in and running information we have compiled to help get you started. (If you have one of our CR125 engines, the break-in procedure is very similar).
Transmission takes 16oz or 450ml of oil. Motul Transoil 10w-30 works well.
Check your rules, but we generally advise 20:1 in the premix at all times.
Preferred oils - Motul Kart Grand Prix 2T, Maxima 927
Preferred fuel – VP MS98
Tape up the radiator. Increase the main jet a size or two from what you determine the optimal jetting should be for the weather, altitude etc.
Warm up the engine on the stand with 2nd gear engaged.
Make sure water is flowing properly by removing the radiator cap.
**Water goes from the bottom of the radiator to the center of the water pump (into the face of the impeller). Water then goes out of the pump to the bottom of the cases. There is a hose (u-bend) that connects between the top of the cases to the cylinder. Finally, the water goes out of the head, into the top of the radiator.**
No other routing is correct
Break-in water temperature should be about 140-145 degrees at variable RPM’s.
On a 30-40 second lap time track slow down your pace 4-5 seconds per lap. You will NOT drive at partial throttle, you must break in at full throttle and Short Shift to keep the RPM’s low. Partial throttle will cause a lean condition.
After about 8 laps you can gradually increase the pace a second per lap, and be at full speed after the 12th lap. (You do not have to come in and cool the engine down). Now gradually remove tape (or open shutters) from the radiator to get down to optimal running temperature, around 125 degrees.
Typical jetting range:
B45 inner pilot jet
60 outer pilot jet
K22 1st-2nd clip from top
Spark Plug- NGK BR10EG, BR10ECS, or 7376-10
This engine utilizes a dry clutch, which wears a lot faster than a wet clutch, so it’s important to check your clutch plates regularly. SwedeTech replaces the heavy steel plates with lighter, hard anodized, aluminum plates for better performance. Make sure to have at least ½ inch of play on your clutch lever at all times. You may even want to have a “broken in” clutch kit to use on race days only. Also, make sure that the clutch arm coming out of the case has clearance and full range of motion without any interference from the cases.
SwedeTech, along with TM Italy, recommends you replace the lower rod bearing and thrust washers at about 20 gallons of fuel through the engine for reliability. For optimum performance we advise replacing top end parts every 5-7 gallons of fuel. When doing a top end rebuild, try to achieve a 0.042” – 0.044” squish between the piston and head, using 0.050” solder.
The torque specs for the 6mm head bolts are 7 ft/lbs. Torque specs for the 8mm flange nut that secures the cylinder to the case are 16 – 18 ft/lbs.
The following is a basic guide to help you fine tune your SwedeTech Racing ICC package. Keep in mind that the information may change from time to time and that this is not a guarantee to gain maximum power from your package, but it should serve as a good foundation.
Your ICC water temperature should be kept consistently around 125 degrees. If you are seeing high temperature, double check your radiator, radiator cap, water line routing, water pump, and water pump drive tension.
Under normal operation, your ICC package should be able to rev to a maximum of 14,000 rpm. This is not your shift point. Your shift point should be around 13,600 – 13,800. Depending on track and gearing configurations.
Keep the engine rpm’s above 10,500 at all times.
The next item to look for is the burn pattern off of the exhaust pipe. You will need to remove the pipe. Looking inside the pipe, you will want to see a half moon black band on the bottom portion of the pipe, near the exhaust manifold exit. The band should be about ¼” wide. Beyond the band, the pipe should have a clean white burn.
If the pipe has heavy carbon build up, there is a good chance the engine is running to rich.
TM Clutch maintenance is extremely important. Check your plates every time you replace the piston ring. The TM utilizes a dry clutch setup. Make sure the clutch cable has play inline so there is no pressure on the plates while the clutch lever is in a neutral sitting position. The plates should measure 0.100” or 2.8mm new. Replace the plates when they are 0.070 or 1.8mm. Failure to do so will cause the clutch to slip under the load of normal racing.