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The first thing you need to do is make sure you have a good battery and that it is fully charged. I'm not that familiar with the Wassel but assume it operates pretty much the same as other ei. If the voltage drops below 12 volts they don't like to function right. They work opposite points. Instead of advancing the timing with increasing rpm, they retard it with decreasing rpm, thus the tendancy to backfire. The next thing to do is check the timing. Any automotive style light will work. Power it off another battery, not the one off the bike as it causes interference. Remove the small cover over the end of the crank. You will see a degree scale. Remove the plugs and use a wd40 straw while rotating the engine by the back wheel with the gearbox in 4th to find tdc. At tdc slowly rotate the wheel backwards until a pad shows up on the alternator rotor with a groove down the middle. Highlight the groove with some paint. This is the timing mark. Put the plugs back in and start the engine. At around 4000 rpm the timing mark should line up with around 30 on the scale. As you rev the bike you should observe see the mark smoothly advance and then quit advancing around 4000.

<blockquote data-quote="htown16" data-source="post: 603837" data-attributes="member: 1322"><p>The first thing you need to do is make sure you have a good battery and that it is fully charged.&nbsp; I&#039;m not that familiar with the Wassel but assume it operates pretty much the same as other ei.&nbsp; If the voltage drops below 12 volts they don&#039;t like to function right.&nbsp; They work opposite points. Instead of advancing the timing with increasing rpm, they retard it with decreasing rpm, thus the tendancy to backfire.&nbsp; The next thing to do is check the timing.&nbsp; Any automotive style light will work. Power it off another battery, not the one off the bike as it causes interference.&nbsp; Remove the small cover over the end of the crank.&nbsp; You will see a degree scale.&nbsp; Remove the plugs and use a wd40 straw while rotating the engine by the back wheel with the gearbox in 4th to find tdc.&nbsp; At tdc slowly rotate the wheel backwards until a pad shows up on the alternator rotor with a groove down the middle.&nbsp; Highlight the groove with some paint.&nbsp; This is the timing mark.&nbsp; Put the plugs back in and start the engine.&nbsp; At around 4000 rpm the timing mark should line up with around 30 on the scale.&nbsp; As you rev the bike you should observe see the mark smoothly advance and then quit advancing around 4000.</p></blockquote><p></p>

[QUOTE="htown16, post: 603837, member: 1322"] The first thing you need to do is make sure you have a good battery and that it is fully charged. I'm not that familiar with the Wassel but assume it operates pretty much the same as other ei. If the voltage drops below 12 volts they don't like to function right. They work opposite points. Instead of advancing the timing with increasing rpm, they retard it with decreasing rpm, thus the tendancy to backfire. The next thing to do is check the timing. Any automotive style light will work. Power it off another battery, not the one off the bike as it causes interference. Remove the small cover over the end of the crank. You will see a degree scale. Remove the plugs and use a wd40 straw while rotating the engine by the back wheel with the gearbox in 4th to find tdc. At tdc slowly rotate the wheel backwards until a pad shows up on the alternator rotor with a groove down the middle. Highlight the groove with some paint. This is the timing mark. Put the plugs back in and start the engine. At around 4000 rpm the timing mark should line up with around 30 on the scale. As you rev the bike you should observe see the mark smoothly advance and then quit advancing around 4000. [/QUOTE]