New NS owner - problem

Bike running like a dog? This section might well answer your questions. Posting restricted to registered users.
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pdevlin
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New NS owner - problem

Post by pdevlin »

Hi guys, I bought an imported '87 NS online a few weeks ago and have had a major problem with it; I cannot get it running properly; the guy that I bought it off swears it was running perfectly before he sent it but I question that. It would only run on one cylinder on tickover with one misfiring and the other not firing at all. At high revs they all fired.
I have found rust in the petrol tank and the carbs were clogged full of rust sludge, which I cleaned out, it still will not run correctly, still with the same issues as above. I also cleaned the fuel tap filter.
I suspected the coils but I was getting a spark at each plug. The bike has only done 5000 kms and I am very concerned it may be the crank seals, anyone got any advice?
Other bikes; KTM RC8, Yam Vmax, Harley Sporster...all Vees...

Alastair
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Location: Glossop U.K.
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Re: New NS owner - problem

Post by Alastair »

Low mileage isn't a good sign at this age. Try a leak down test.

pdevlin
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Re: New NS owner - problem

Post by pdevlin »

Alastair, thanks for the reply, forgive my ignorance but can I do a leak down test myself or is it specialist job? The bike is generally in great condition and was imported by a regular importer but did have reservations about the low mlage...
Other bikes; KTM RC8, Yam Vmax, Harley Sporster...all Vees...

Mark
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Joined: Thu Oct 25, 2001 1:01 am
Location: Up Norf

Re: New NS owner - problem

Post by Mark »

This should give you an idea of what's required. You can make your own test kit for around £15 using some appropriate sizes bungs and a sphygmomanometer (blood pressure tester/monitor)

Leak down test
http://www.youtube.com/watch?v=zdq7NRcUIp8

Bloood pressure monitor
http://www.ebay.co.uk/itm/Aneroid-Sphyg ... 2a148a9d06
If it ain't broke, fix it 'til it is.

pdevlin
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Re: New NS owner - problem

Post by pdevlin »

Thanks for that Mark I will give it go. I'm offshore at the moment but I will be back home in January so I'm trying to get as much info as I can to get the problem sorted; I also plan to have the carbs sonically cleaned and the electrical system tested...once its sorted I can move on to the more fun stuff like JL pipes and a bit of a tune...
Other bikes; KTM RC8, Yam Vmax, Harley Sporster...all Vees...

Channel Hopper
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Joined: Thu Sep 23, 2004 5:26 pm

Re: New NS owner - problem

Post by Channel Hopper »

In the meatime though,run the bike until warm and then take indoors. Then drain the tank, tap , carbs and all lines of petrol, take out the sparkplugs and spray WD40 and some oil in the ports. This may prevent any further damage caused by fuel that may have linger at the bottom of the crank

pdevlin
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Re: New NS owner - problem

Post by pdevlin »

Good advice ,thanks..
Other bikes; KTM RC8, Yam Vmax, Harley Sporster...all Vees...

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