• Nc29 won't run properly

Posted: **Sun Sep 10, 2017 8:41 pm**

My last nc29 had over 100,000km on it. When I got it it had no clocks or bodywork so I just stuck the clocks on it I got from eBay . But the previous owner got in touch and said it had 70,000 when he sold it 10yrs ago.

Posted: **Tue Sep 12, 2017 8:32 pm**

dunkenb wrote:My last nc29 had over 100,000km on it. When I got it it had no clocks or bodywork so I just stuck the clocks on it I got from eBay . But the previous owner got in touch and said it had 70,000 when he sold it 10yrs ago.

Ahh that is great! I hate it when many bike owners say that a 50000 miles motorcycle is high mileage.

I'm already approaching half away across 26000 Mil/km. I am using the bike everyday at the moment...I will do my best to take care of it and change the oil and filter regularly....but it must do 100k without any engine rebuild. I may have to adjust the valves (send it to a shop to do maybe)

Posted: **Wed Sep 13, 2017 10:32 am**

dunkenb wrote:So... She starts ok, but tick over seems like it's on three cylinders unless I use a bit of choke. After a while running it gets rough. Bogging down and low on power. Outer two plugs seem good but inner ones look like theyre not running but they are as they get hot?
I've replace plug caps,leads,plugs....had the carbs ultrasonically cleaned and new mixture screw o-rings...checked coils for resistance and both within spec.checked the pick up coil and that's all good. Checked the battery and charging system.

What the hell is going on? I've had the carbs off about 30 times. The only thing I found wrong was the two plug caps for 2 and 3 were duff.

Any thoughts? Would a dodgy ECU give any symptoms? Or perhaps a speed limiter fault?

Are all floats shutting off ok, float heights ok? Needle valves ok?

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Posted: **Wed Sep 13, 2017 10:36 am**

Yeah all check out, it seems to have gone badly out of sync ,so that number 4 cylinder was running really rich and fouling the plug.
I've synced them with vacuum gauges now, and it seems better. Took ages as one of the vacuum take offs was blocked, messing up the readings. [emoji41]

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Posted: **Fri Jan 19, 2018 12:55 pm**

dunkenb wrote:Yeah all check out, it seems to have gone badly out of sync ,so that number 4 cylinder was running really rich and fouling the plug.
I've synced them with vacuum gauges now, and it seems better. Took ages as one of the vacuum take offs was blocked, messing up the readings. [emoji41]

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Finally sorted out the running problems by installing a new set of pilot jets.

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Posted: **Fri Jan 19, 2018 10:52 pm**

So it's completely cured now??

Posted: **Sun Jan 21, 2018 9:17 am**

Yeah, fingers crossed. It’s still a little out but I think that could be down to the pipe and sp engineering can. A little more tinkering with washers on the needle should sort it but it’s a bit bloody cold in my garage at the moment

Nc29 won't run properly

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