Naughty K 100 rs 1984 model,

moriarti · 1 Naughty K 100 rs 1984 model, Sat Feb 16, 2019 1:34 pm

moriarti

Life time member

Number of posts : 695

Hi everyone many brains needed for this one.OK bike runs a dream until you start to ride harder eg, 80 mph plus,engine nice and warm .THEN the damn thing cuts out and re starts in a second not nice,this will continue every few minutes until i stop and wait for 20 mins or so, set off again ride easy all ok wind it up and bother it starts again .NO lights come on when this happens,if i pull over and stop the bike runs perfectly . affraid

what am i to do ,help and good humour most welcome lol!

daveyson · 2 Cutting out Sat Feb 16, 2019 2:28 pm

daveyson

Life time member

Number of posts : 1281

Hall sensors?

moriarti · 3 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 3:40 pm

moriarti

Life time member

Number of posts : 695

daveyson wrote:Hall sensors?

My thinking too, study

Iwas hoping for "its a loose fuse number 69 in the box" Razz

Dont like putting the hand in pocket syndrome,Ill give Motorworks a ring and stand the pain if i must.Thanks for your opinion,as we say up here 2 heads are better than 1 even if their sheep heads he he . Naughty K 100 rs 1984 model, 161205

daveyson · 4 Cuttig out Sat Feb 16, 2019 3:44 pm

daveyson

Life time member

Number of posts : 1281

There's probably a way to test it before ordering a new one.

daveyson · 5 Cutting out Sat Feb 16, 2019 3:59 pm

daveyson

Life time member

Number of posts : 1281

On some cars you could spray them with water and it would suddenly be problem solved, but your case is so short timed it might make no difference.

duck · 6 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 4:12 pm

duck

Life time member

Number of posts : 4283

Typically a bike dieing when it gets warmed up is a sign of the HES going bad.

Take some cool water with you and throw that on the HES cover to see if that makes it start again.

Another thing you can do to test is remove the HES cover (try to do it carefully so as not to tear the gasket) then use a heat gun on the HES to see if it will cause the bike to die.

Another possible issue is the gas tank connector being flaky - causing the fuel pump to run intermittently.

Or a flaky ignition switch.

moriarti · 7 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 5:54 pm

moriarti

Life time member

Number of posts : 695

duck wrote:Typically a bike dieing when it gets warmed up is a sign of the HES going bad.

Take some cool water with you and throw that on the HES cover to see if that makes it start again.

Another thing you can do to test is remove the HES cover (try to do it carefully so as not to tear the gasket) then use a heat gun on the HES to see if it will cause the bike to die.

Another possible issue is the gas tank connector being flaky - causing the fuel pump to run intermittently.

Or a flaky ignition switch.

thanks duck ,i can run the bike on the stand for over an hour rad fan running flat out ,and the engine NEVER misses a beat,only fails over 3000 rpm when being ridden,cuts out and back in in a second stop at rd side and rev 5/6000 no problem Embarassed

,set off again ride hard problem back again Evil or Very Mad

I will however try the hot air/dryer idea,Wish me luck as i try to protect my pocket lol!

daveyson · 8 Naughty Sat Feb 16, 2019 6:07 pm

daveyson

Life time member

Number of posts : 1281

Temperature sensor?

daveyson · 9 Octane Sat Feb 16, 2019 6:18 pm

daveyson

Life time member

Number of posts : 1281

I'd avoid running it for an hour on the stand, it wasn't designed for that.

duck · 10 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 6:58 pm

duck

Life time member

Number of posts : 4283

daveyson wrote:I'd avoid running it for an hour on the stand, it wasn't designed for that.

Yes. The owner's manual recommends starting it and riding off. Lots of idling also tends to foul spark plugs, especially on K75s.

moriarti · 11 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 8:07 pm

moriarti

Life time member

Number of posts : 695

daveyson wrote:I'd avoid running it for an hour on the stand, it wasn't designed for that.

True,now here is the thing in heavy traffic on a hot day high temp light comes on until out of traffic ,AND still no fault,Fault only o cures at speed over 70/80 mph plus,I haven't had this problem myself,my friend Jim has the problem when he rides the bike,over the last few months i noticed today when he got back that he uses the kill switch to stop the engine .Something i never do,when asked his reply was ,i always use it.Now bearing in mind the age of the bike and in over 20 the kill switch has not been used,couldit be a simple case of sticking switch ,
with a bit of vibration at high speed,We live in hope of easy fix Shocked

Laitch · 12 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 9:11 pm

Laitch

Life time member

Number of posts : 3134

moriarti wrote:. . . i can run the bike on the stand for over an hour rad fan running flat out ,and the engine NEVER misses a beat . . . here is the thing in heavy traffic on a hot day high temp light comes on until out of traffic ,AND still no fault,

While the engine idles for an hour with a coolant system in good condition, my experience indicates that the fan should run intermittently, not flat out.

Consider reviewing the condition of your moto's radiator, pressure cap, coolant, coolant temperature sensor, temperature sensing switch, fan and fan wiring. On a moto with a cooling system in good condition, the high temp light should not be activated in heavy traffic on a hot day; instead, the fan should run more often and for longer intervals keeping the engine at appropriate operating temperature.

Intermittent cut-out can be a symptom of defective electrical connections other than Hall sensors. Inspecting and testing Hall sensors is good practice when a fully warmed engine cuts out and can be restarted after cool-down but your moto seems to have problems with its cooling system beyond their condition.

daveyson · 13 Naughty Sat Feb 16, 2019 9:32 pm

daveyson

Life time member

Number of posts : 1281

+1 what Laitch says
Also, it doesn't cut out at high temperatures if your riding but does for the other guy. So it's not a temperature related problem so much. Probably the kill switch wants a good clean.

daveyson · 14 Naughty Sun Feb 17, 2019 1:39 am

daveyson

Life time member

Number of posts : 1281

Ask him for more detail so you can repeat it.

Could it be he is not used to the feeling of fuel cutting out on deceleration, then instinctively he accelerates to compensate? That might explain the one second duration. Throttle position sensor adjusted?

Rick G · 15 Re: Naughty K 100 rs 1984 model, Sun Feb 17, 2019 1:50 am

Rick G

admin

Number of posts : 12028

First place I would be looking would be the connection to the tank then the ignition switch and I would give odds on that you find the fault.

Suzi Q · 16 Re: Naughty K 100 rs 1984 model, Sun Feb 17, 2019 4:06 am

Suzi Q

Life time member

Number of posts : 1377

From the symptoms it suggests some consistency between high revs/cutting out and low revs/ok. If you are certain that is what is happening, and the consistency is strong, then I'd add a suggestion that you could have a blocked fuel filter. Happened to me.

I wouldn't have described it as fully 'cutting out' though; more like a horrible rev limiter - coughing and missing and dying and not revving past four or five thousand or so. Ran fine at lower revs.

BTW whereabouts in West Yorksher are you - I am a spit from M1 J36 and I have a spare Hall sensor, available on Sundays too...!

92KK 84WW Olaf · 17 Re: Naughty K 100 rs 1984 model, Sun Feb 17, 2019 2:15 pm

92KK 84WW Olaf

Life time member

Number of posts : 7897

My 84 did that sometimes.....electrical plug on front left of the gas tank was an issue, adjusted the pins.

Then it started happening again.....lose plug on the injection unit under the seat.

Hall sensors fail don't normally give an instant restart.

Temp sensor on 2v does not have a cut out function, it only has a start inhibit function if over heated. If your fan is working ok it should kick in so the temp light does not come on.

moriarti · 18 Re: Naughty K 100 rs 1984 model, Sun Feb 17, 2019 4:35 pm

moriarti

Life time member

Number of posts : 695

chris846 wrote:From the symptoms it suggests some consistency between high revs/cutting out and low revs/ok. If you are certain that is what is happening, and the consistency is strong, then I'd add a suggestion that you could have a blocked fuel filter. Happened to me.

I wouldn't have described it as fully 'cutting out' though; more like a horrible rev limiter - coughing and missing and dying and not revving past four or five thousand or so. Ran fine at lower revs.

BTW whereabouts in West Yorksher are you - I am a spit from M1 J36 and I have a spare Hall sensor, available on Sundays too...!

Moriarti wrote:
mANY THANKS to all for you advice and ideas ,im making a list and will post after iv finished the jobs,TO chris846 thanks for the offer im in Brighouse about 45 minutes away from your good self,i will contact you should i need to loan the hall sensor

moriarti · 19 JOBS DONE Tue Mar 19, 2019 8:28 am

moriarti

Life time member

Number of posts : 695

HI to all,First, welcome to our new members, Very Happy

i am having trouble with the site,NOT SECURE WARNING stopping me logging in affraid

.Now back to the K ,Hall sensors,tested out ok both hot/cold (hairdryer is good for this test)
ignition switch ok .All grounds test ok ,Only fault found is Light switch off/side/ head faulty,starter button/kill switch,some corrosion in contact area plus heavy corrosion on square connector to main harness .
S/H unit from MOTORWORKS £25,Cleaned all contacts.Just waiting for a nice day to ride out and test,
A local K specialist had a very easy FIX suggestion KEEP YOUR MATE OFF THE BIKE cheers

now why didn't you lot think of that one Razz

92KK 84WW Olaf · 20 Re: Naughty K 100 rs 1984 model, Tue Mar 19, 2019 11:05 am

92KK 84WW Olaf

Life time member

Number of posts : 7897

moriarti wrote:HI to all,First, welcome to our new members, i am having trouble with the site,NOT SECURE WARNING stopping me logging in .Now back to the K ,Hall sensors,tested out ok both hot/cold (hairdryer is good for this test)
ignition switch ok .All grounds test ok ,Only fault found is Light switch off/side/ head faulty,starter button/kill switch,some corrosion in contact area plus heavy corrosion on square connector to main harness .
S/H unit from MOTORWORKS £25,Cleaned all contacts.Just waiting for a nice day to ride out and test,
A local K specialist had a very easy FIX suggestion KEEP YOUR MATE OFF THE BIKE now why didn't you lot think of that one

He probably has early stages of K Pox.

daveyson · 21 Naughty k100 Wed Mar 20, 2019 3:16 am

daveyson

Life time member

Number of posts : 1281

If he is not aware that with your brick, the fuel cuts out on deceleration, it's probably OK to let him ride it. Some people are easily offended if baned from a bike, on the other hand, it's hard to break a brick. bounce

Sponsored content

1 Naughty K 100 rs 1984 model, Sat Feb 16, 2019 1:34 pm

moriarti

2 Cutting out Sat Feb 16, 2019 2:28 pm

daveyson

3 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 3:40 pm

moriarti

4 Cuttig out Sat Feb 16, 2019 3:44 pm

daveyson

5 Cutting out Sat Feb 16, 2019 3:59 pm

daveyson

6 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 4:12 pm

duck

7 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 5:54 pm

moriarti

8 Naughty Sat Feb 16, 2019 6:07 pm

daveyson

9 Octane Sat Feb 16, 2019 6:18 pm

daveyson

10 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 6:58 pm

duck

11 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 8:07 pm

moriarti

12 Re: Naughty K 100 rs 1984 model, Sat Feb 16, 2019 9:11 pm

Laitch

13 Naughty Sat Feb 16, 2019 9:32 pm

daveyson

14 Naughty Sun Feb 17, 2019 1:39 am

daveyson

15 Re: Naughty K 100 rs 1984 model, Sun Feb 17, 2019 1:50 am

Rick G

16 Re: Naughty K 100 rs 1984 model, Sun Feb 17, 2019 4:06 am

Suzi Q

17 Re: Naughty K 100 rs 1984 model, Sun Feb 17, 2019 2:15 pm

92KK 84WW Olaf

18 Re: Naughty K 100 rs 1984 model, Sun Feb 17, 2019 4:35 pm

moriarti

19 JOBS DONE Tue Mar 19, 2019 8:28 am

moriarti

20 Re: Naughty K 100 rs 1984 model, Tue Mar 19, 2019 11:05 am

92KK 84WW Olaf

21 Naughty k100 Wed Mar 20, 2019 3:16 am

daveyson

22 Re: Naughty K 100 rs 1984 model,

Sponsored content