**Help needed: 1100 engine into 796 frame**

[Raux]

You can check the wiring doagrams or manula but like only difference on ignition system would be coils and plug wires. So just get them from  an 1100. Exhaust port location could oe could not be the same as 1100 on evo motor. You would have to test fit that.

[Raux]

And now i see the exhaust diff... Ok i get it.

[ungeheuer]

Raux's suggestion is the easiest way to get around M1100DS.... just use M1100DS coils etc.

Other considerations.... M1100DS motors come with dry clutch, M1100Evo with wet clutch (like your 796).  And there's still the question as to whether Evo runs Siemens ECU?  Coz if not, then you should forget Evo motors IMO.

[Gaijinsamadesu]

On a non-evo engine, do both spark plugs on one cylinder fire at the same time, or do they take it in turns?

If my bike costs more to fix than it's worth, and I can't get any money for the parts, I might keep it as a hobby bike and try this project over time.

[Gaijinsamadesu]

Also, is there any feedback to the ECU telling it that the coil is firing correctly?

[ducpainter]

Both plugs at once...hence dual-spark.

[Gaijinsamadesu]

Is there a sensor telling the ECU that both spark plugs are firing?  I'm wondering if there's a work-around regarding the single spark (796) swap to to dual spark (non-evo) issue.

[Gaijinsamadesu]

Or, for example, if you had a non-evo M1100, unplugged the spark plugs on the timing belt side, would it throw up error signals?

[Gaijinsamadesu]

My guess is that it would throw out an error signal.  Is there a way to fool the sensor?

[Yogi]

Is there a sensor telling the ECU that both spark plugs are firing?  I'm wondering if there's a work-around regarding the single spark (796) swap to to dual spark (non-evo) issue.

No the coil fires both plugs at once from one signal you could use a single plug coil from the 796 and just leave one plug not connected it would run , but the main reason for having twin spark plugs is poor design and efficiency of the combustion chamber hence "Evo" motors have a better combustion chamber and piston shape to burn the fuel more efficiently with one spark plug.  So yes it would run with one plug only firing but would be down on power and be worse for MPG.

[Gaijinsamadesu]

Does anyone know if you can take off the top cylinder head on a 796 without having to take out the engine?  My mechanic says the camshaft won't turn, but he hasn't actually taken the head off to see the extent of the damage because he would have to charge labor.  If it's possible to take it off without having to take out the engine, I may just do it myself.

[ducpainter]

It was possible on older bikes. Not sure about the 796

[ungeheuer]

No the coil fires both plugs at once from one signal you could use a single plug coil from the 796 and just leave one plug not connected it would run , but the main reason for having twin spark plugs is poor design and efficiency of the combustion chamber hence "Evo" motors have a better combustion chamber and piston shape to burn the fuel more efficiently with one spark plug.  So yes it would run with one plug only firing but would be down on power and be worse for MPG.

^^ Not sure I agree with much of that.

If you're gonna do it, just use the correct coils for the motor you're gonna install.

[Gaijinsamadesu]

Hmm, interesting.  So the 1100 non-evo engine swap idea may not be dead.  Just plug the spark plug hole one the timing belt side and put in a single spark ignition coil.  Seems like I would need:

- M1100 non-evo engine
- M 1100 race ecu
- single spark ignition coil
- spark plug hole plug (or just a normal spark plug in the hole)

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[ducpainter]

^^ Not sure I agree with much of that.

If you're gonna do it, just use the correct coils for the motor you're gonna install.

It's true that the DS design made up for the inefficiencies in the earlier design Monster heads. It's why you see many 900's dual plugged.

As far as running it with one plug, just do it right and swap out the coils.