Engine Starting Procedures for 2-Stroke and 4-Stroke machines

A simple guide to help you start your TM Racing machines engine.


2-Stroke Engine Staring Procedures:-

After a visual safety check that the machine is ready to ride ensure that the fuel tank is filled with fresh super-unleaded fuel pre-mixed at a ratio of 40:1 with a high quality synthetic 2-Stroke racing premix oil.

Turn the fuel tap to the 'ON' or 'RESERVE' position

For cold starts pull up the choke knob on the carburettor, for a warm engine start the choke is not necessary.

Pull the kickstart lever to the 'out 'position and using the full travel of the lever kick downward until the engine fires.

Replace the kickstart lever to the 'in' position.

Once the engine is running allow the engine to warm by holding the throttle partially open at a steady and constant rpm (on cold starts the choke can be pushed to the 'closed' position after 20 seconds).

Once temperature has begun to rise in the radiators and the engine cylinder begin to gently open the throttle allowing the revs to slowly increase, repeat this procedure several times allowing the rpm's to increase gradually, this will allow the engine to 'clean / clear itself out' and remove any excess oil form the engine cases and combustion area. Once the engine has reduced smoking, the throttle response is sharp and there seems to be no hesitancy in the engine the bike is ready to ride. It is advisable to allow all of the engine components to come up to operating temperature by riding the bike on no more than 1/2 throttle for the first 5 minutes of use on the track.

 

4-Stroke Starting Procedure - Carbureted Engine Machines:-

After a visual safety check that the machine is ready to ride and the oil level is correct ensure that the fuel tank is filled with fresh Super-Unleaded fuel.

Turn the fuel tap the 'ON' or 'RESERVE' position

For cold starts pull out the choke knob and lock it into position, for warm engine starts the choke will not be necessary, under extreme high temperatures any reluctancy of the engine to start will counteracted by using the 'Hot-Start' lever mounted on the handlebars, or on some models, located by the side of the carburettor on the right hand side of the machine (red coloured knob)

Pull the kickstart lever to the out position and using a slow, smooth continous stroke push the lever down until you hear an audible 'click' and stop allowing the kickstarter to retuen to its resting postion at the top of its travel, the 'click' is the automatic decompressor re-setting itself and is a simple tell-tale that gives you an indication that the engine is now in the correct part of the engines 'stroke' cycle that will enable the easiest starting. The 'click' although un-audible under race conditions is a marker that also gives the operator feedback through the leg, the resistance on the operators leg will change and this can be felt and interpreted by the operator who will learn to find the correct place by feel alone. With the kickstarter now at it's resting postion kick the starter lever downward from the top of its stroke right to the bottom in a continous, rapid manner, do not attempt to kick using 'half strokes' like you may on a 2-Stroke engined machine, this kind of 'kicking' will only make starting more difficult as the complete engine cycle will not be completed. In the even that the engine does not fire it may be advisable to repeat the procedure but prior to kicking to start the engine give the throttle two short twists to allow the accelerator pump to introduce some fuel into the inlet tract to aid cold starting.

Once the engine had fired and running steadily replace the kickstart ever to the 'IN' position.

Once the engine is running steadily allow 30 seconds before closing the choke knob (if starting in extrmely high temperatures relase the 'Hot-Start lever' after several second allowing the machine to settle to idle), allow the engine to warm gently, there is no need to increase rpm's or 'blip' the throttle on a 4-Stroke engine as there is nothing to 'clean / clear out'. Once the radiators are warm you are ready to ride, do not allow the machine to sit idling for long periods, a 4-Stroke engine will increase it's temperature much faster than a 2-Stroke machine leading to excessive heat build-up, boil-over and potential engine damage. It is advisable to allow all of the engine component to come up to operating temperature by using no more than 1/2 throttle for the first five minutes of use on the track

4-Stroke Engine Starting Procedure - Electronic Fuel Injection Engine Machines:-

After a visual safety check that the machine is ready to ride and the oil level is correct ensure the fual tank is filled with fresh Super-Unleaded fuel.

Efi equipped machine do not have 'fuel taps' as the sealed system prevents fuel loss and leakages occuring.

Pull the kickstart lever to the 'out' postion, holding open the 'cold start lever' which is located on the front brake master cylinder bracket and making sure the throttle is closed kick the starter lever downward in a continous, rapid manner, from the top of the starter levers travel right to the bottom.

WARNING: do not under any circumstances attempt to kick using 'half/partial strokes' like you may on a 2-Stroke engined machine or a carbureted 4-Stroke machine, this kind of kicking on a battery-less electronic fuel Injected machine will have the same effect as trying to start a carbureted 4-Stroke machine with the throttle wide open.

With only 1 or 2 full travel kicks the engine should fire, if it does not then do not keep repeatedly trying to start the machine in this manner, the following actions must be applied simaltaneously.

1.Hold the throttle open partially,

2.Depress the kill switch button (stop engine position)

3.Kick the starter lever from the top of its travel to the bottom 5 times

This procedure resets the system and discharges any excess fuel from the cylinder, now repeat the original starting procedure again.

After the engine has fired replace the kickstart lever to the 'in' position. 

Once the engine has fired and is running keep the 'cold start lever' open for 60 seconds, this allows the Fuel Injection system time to recalibrate itself and for the engine to warm initially (for engines starting in higher temperatures the 'cold start lever' must still be used, effectively now becoming a 'hot start lever', but release the lever after only a few seconds of the engine firing), once the radiators are warm the bike is ready to ride. It is advisble to allow of the the engine components to come up to temperature by using no more than 1/2 throttle for the first 5 minutes of use on the track.

Note: Please do not leave engines 'ticking-over' unecessarily, once the engine had been started and the 'choke/hot start lever has been released you can gently begin to open the throttle slowly allowing the revs to rise in a smooth controlled manner - not in short sharp aggressive bursts as this could lead to 'cough' stalling of your performance racing machine. Performing start-up in this way will allow the engine to come up to temperature correctly, once both radiators have begun to warm sufficiently you can ride the machine, please  allow a little track time at a reduced pace and engine revolutions to allow all the necessary engine components, the oil and the cooling system to reach their required operating temperatures.

 

TM UK - 01249 715523