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Newbie With MT9 running on one pot

MT9 Timing problem missing running on one

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#1 QLD Brewsters

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Posted 10 August 2015 - 03:45 AM

G'day folks,
I have recently inherited an MT9 that has been in storage for about 30 years and am in the process of restoring it.
It will start first kick but will only run on one pot. However after it has been shut down I can start it up again and it will sometimes fire up on the other cylinder and run just as well as it did on the other side. When running there is ample spark to both plugs {new}.Both sides are receiving fuel.
I have been through the motions of setting the timing and valve clearances but am at a loss as to what may be causing this issue. Any advice will be surely appreciated.
Cheers
Merv

#2 shoetou

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Posted 10 August 2015 - 06:04 PM

coil sounds like
Marko

2008 Dnepr mt 16 true year any body's guess

There is more to life than increasing its speed
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if only the mt 16 could go 50 mph

I think a good name for my MT 16 is (the bad girl) every body wants to ride her but nobody wants to take her home )

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#3 sallen

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Posted 10 August 2015 - 08:12 PM

You did not mention what type ignition you have, electronic or points.
If you have positive fuel and compression, the only thing left is spark. If you have the wasted spark ignition that leaves only the plugs and wires.

#4 QLD Brewsters

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Posted 11 August 2015 - 03:56 PM

Sorry lads,got called away on a job.
The bike has points ignition.New leads and plugs did not change anything and when I take a lead off the side not firing it will throw a bright spark a half inch long so I don't think the coil is the problem. If the timing was out would it still be able to swap and change which cylinder it runs on? This has got a few of us scratching our heads.

#5 sallen

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Posted 11 August 2015 - 08:34 PM

You know every thing is working on the left bank, so I'd start with swapping the plugs, then the wire leads at the coil and finally the carbs.
If the problem persist then it would indicate a mechanical problem.

#6 QLD Brewsters

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Posted 12 August 2015 - 12:32 AM

The problem is that it will run on one side and then when you shut it down and restart it, it will start and run on the other side or whichever side fires first I suppose. I have
swapped around plugs and leads and then realized that it has been running on both just not at the same time so the fuel and the electric side of things must be OK. I will go through the motions and reset the valve clearances and the timing again just in case I missed something, but I am fairly certain it all ended up true to the manual that I downloaded-will have to compare manual that I am using to any others I can find online just in case they differ.

#7 sallen

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Posted 12 August 2015 - 09:40 AM

You've got a real stumper.
Sounds like the ultimate electrical gremlin attack.

It's a long shot, but it could possibly be either a weak battery or condenser.
The coil needs about 8 volts minimum to operate reliably.
The condenser could be failing and only functioning sporadically.

It' got me scratching my head.

#8 sallen

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Posted 12 August 2015 - 04:10 PM

Hey QLD Brewsters,
I  bounced your problem of some friends and there was one suggestion as to the points ignition.
Set the point gap than rotate the engine 180 deg and check the gap. The thought being, the lobe on the points cam may be
worn more one side, not allowing enough of and opening to fire the plug. Also check the points follower.
Just another shot in the dark.
Hope you find the problem.
"Damn electrisacals" as my brother would put it.

#9 QLD Brewsters

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Posted 12 August 2015 - 07:32 PM

Thanks for the input boys,
If I get some time tonight I will check the gap as you suggest, it is a definite possibility.





Also tagged with one or more of these keywords: MT9, Timing problem, missing, running on one

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