Problem with tacho

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rzDave
Posts: 4
Joined: Sun Oct 28, 2007 5:50 pm

Problem with tacho

Post by rzDave »

Hi all,
A freind of me just bought a Canadian 1986 NS400r,the bike hadn't been
driven for the last 10 years,so i put a new battery in and check the charging
system:13.5 volts at idle.I drive a little bit around and the neddle of the
tachometer is freaking it out,at idle and with a gentle acceleration every
thing seem to work fine but in hard acceleration the neddle go crazy...
By the way it seem to have a lack of power sometime at high RPM???
I can't put the front wheel in the air in first gear????I check the continuity
of the y/g wire ,the ignition coil resistance primary:0.4 ohm
secondary 8.9k ohms.I put dielectric grease on every contact of CDI
and y/g wire and nothing change,the engin start easely 1,2 kicks.
I don't have a CDI tester,there's no broken wire,the bike had 10,000km
every thing seem new BUT... Need help
Dave

ducnomore
Posts: 163
Joined: Wed May 18, 2005 9:01 pm
Location: Ontario

Re: Problem with tacho

Post by ducnomore »

Probably the stator assembly, home of the exciter coils. A popular problem with the NS. Do you have a spare to try? And what country are you in?
What do you think guys?
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1986 NS400R
2007 GSXR1000

Ian
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Re: Problem with tacho

Post by Ian »


rzDave
Posts: 4
Joined: Sun Oct 28, 2007 5:50 pm

Re: Problem with tacho

Post by rzDave »

I lived on the south-shore fo Montreal in Quebec and i don't have any extra parts(stator assy)
or any puller to remove mine!!!!!
Thank's
Dave

ducnomore
Posts: 163
Joined: Wed May 18, 2005 9:01 pm
Location: Ontario

Re: Problem with tacho

Post by ducnomore »

All you need for a tool is a bolt. Called M18x1.5 metric obviously.
Get one that is about 1.5-2 inches long. Run it in with an impact gun. Off she comes.
Getting another stator however will be a problem. Search ebay and the i-net, and post in the wanted section here.
Good luck :)
Image Image
1986 NS400R
2007 GSXR1000

rzDave
Posts: 4
Joined: Sun Oct 28, 2007 5:50 pm

Re: Problem with tacho

Post by rzDave »

Thank's guys,I send the stator to "RM STATOR"and they repair it. :) Today i drove it for 60km,it seems ok.
Is't normal that a stock ns don't pull that hard pass 8500 rpm?? :shock: At this rpm the tach needle start to move
up and down,not as much as the beginning :( ,if i keep the throttle on the rpm will go to 9000-9500.
Now what's up???? Do you have any ideal??
Dave

Channel Hopper
Posts: 1329
Joined: Thu Sep 23, 2004 5:26 pm

Re: Problem with tacho

Post by Channel Hopper »

The new problem could be anything really on an old girl like the NS

Carbon in the exhausts
Sticking ATACs
Carb corrosion or blocked venturi
Dodgy fuel
Coil issues

But I would start off with something under the generator cover that you may have disturbed when replacing the stator.

Have you put the sensors back in the same positions ?

rzDave
Posts: 4
Joined: Sun Oct 28, 2007 5:50 pm

Re: Problem with tacho

Post by rzDave »

I try to move the sensors but threre's not much room to move them.
Now it work fine but the tach needle is still freaking at high rpm :?
It 's normal that the engin stop pulling at 9000-9500 rpm???? :o Is there a way to check the tach for the
needle problem.When i get out of gaz the needle goes up and down before the reserve came in play :o
Is this way to go is normal?? :?
Thank Dave

Luciano
Posts: 156
Joined: Sat May 10, 2003 1:01 am
Location: Sweden, Malmö

Re: Problem with tacho

Post by Luciano »

FYI
I had problems with my bike that my rev counter at higher revs vent back and forth. At the same time i have a second rev counter attached to cylinder no1 that showed more then the double revs and its shift light was on all the time when i drove. http://www.veypor.com/

The bike was rather hard to start at this point. Looks like it could start with much help from the middle cylinder (no2) that worked OK. And i could drive home without any difficulty but I could feel loss of power (when the ignition on one and three did not work as it should).

After changing CDI boxes all is working OK!
It seamed that the CDI box for cylinder 1 and 3 is the faulty one in this case...
Best regards, Luciano.
Torque over the whole register.

Grant Ely
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Joined: Sat Jul 25, 2015 3:20 pm
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Re: Problem with tacho

Post by Grant Ely »

I recently got myself an NS which hasn't been used for 5+years so I decided t give it a service. On tickover or when slowing down the rev counter bounces down to zero and the rear cylinder pops but the bike still ticks over. I did have a problem with coolant being pressurised in the header tank so I replaced the head gaskets and have done a complete service on it. I have replaced plugs and plug caps and tried swapping them round as it was only doing this on the top cylinder. Any ideas?

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