Because I don't have a clue what's wrong I'm going to list everything I know.

My friend Matt was already coming over for a spline lube when he told me that in the last few days his bike has been harder and harder to start in the mornings. Also it ran rough in first and second.

We did the spline lube and also replaced the main shaft O ring and clutch. After reassembly the bike just wouldn't start at all. After a while of trying it idled for a little while but would not accelerate. We checked it had spark & 32lbs at the fuel rail. We did a compression check and did find one cylinder week (190 - 135 - 175 - 190).

Changing the computer didn't help. I plugged in a new temperature sensor and she ran. I thought we were home free....

All of a sudden I noticed a significant lag when accelerating from idle.

I let the bike sit for a couple of days and when I tried to start it on the 3rd day; NOTHING. No sputter, no Idle.

Yes there was spark. I swapped the temperature sensor yet again and it started again. For a while it even had instant throttle response. I called my friend Matt and told him to come and get his bike. When he got here it simply didn't even start again. After trying the temperature sensor with no luck I unplugged the throttle positioning sensor ( I don't know why) and It started.

I plugged in the still installed 2nd temperature sensor and it still started. I replugged the throttle positioning sensor and it still started.

The hesitation from idle to throttle up is back......

Now the bike has started every time for the last 4 hours.

I did clean the grounds.....

The battery is new and massive.

I just know this bike is going to stop running I just don't know why...
We did check the valve clearances after we saw the bad compression.

1 2 3 4
Compression: 190 135 175 190

Valves 0.178/0.25 0.152/0.23 0.125/0.27 0.127/0.229

I did also notice that the timing chain seemed loose to me. I could wiggle it 1/4" back and forth between the cams

y a t'il des mecs bon en anglais et en méca ici bas ??

lolo89 a écrit:y a t'il des mecs bon en anglais et en méca ici bas ??

forcément, toi sorti du Burgonde ...........
en gros la brêle de son pote ne démarrait pas en ayant changé la batterie, les bougies, vérification des compressions (pas top selon lui). Ensuite en décalant le capteur Hall et en changeant la sonde de température elle a fini par démarrer, mais pas vraiment de question visiblement....................d'après ce que je pige.
En gros ça marche sans qu'il ne sache trop pourquoi !

So Gilou7 ...
I'll try and give you some more ideas about your bike's troubles.
Just excuse for my poor technical english...

I've experienced something like this. My 16S RS/1 didn't want to know anything about running after a simple oil change ... Waouh, what a joke !

I knew by experience that it could be a fuel filter trouble. After few years and accordingly to fuel quality, the filter could be obstructed. And our K injection is very sensible to fuel pressure. Let's try ! But it wasn't the good solution at that time ...

I was sure not having any trouble with fuel injectors, but did you check them ?

I thought hardly to electrical failure, especially lighting trouble. When checking, the spark plugs gave a spark ... Nothing more with "hall" sensor.
As I had a spare induction-coil I tried a change. And ... it ran !
Hoo ! What's up lady !! I rolled back with the origin coil and .. it ran !
What's that mystery ?
Than I remembered about all I did while oil change ... and during the two days I spent on this trouble. I noticed that the spark was quite weak, more yellow than electrical blue. Checking again, that time was a nice, magnifiscent electrical blue spark ! And I had checked electrical connections before failure just to see if everything was ok ...
In the end, the trouble was that the primary 12V had to be weak by a bad contact somewhere, giving a bad high voltage current resulting in a yellow spark .. And by changing the coil, the electrical wire has been moved, giving again good contact ...

So, may be could be one or more of these troubles for your bike ?
Let try and give us news !

You can find a manual in english here :
http://users.teledisnet.be/web/pda01308/

c'est ça la mondialisation, tout le monde avec les mêmes problèmes ... en différentes langues !

J'ai compris les grandes lignes et Hubert ton english n'est pas mauvais!
Ce que je trouve exceptionnel c'est qu'un collègue américain s'adresse au forum pour comprendre l'origine de ses problèmes. Si ça ce n'est pas de la fraternité motarde et l'esprit du forum, je ne m'y connais pas.
Bravo à toi Hubert pour l'effort fait de lui répondre dans la langue de Shakespeare. Respect.

It sounds like an electrical issue.

Did you take a look to your ground connection. As far as I know there is one at the gear box backend and another one under the tank hidden under wires nearby handlebar swith connectors.

Also as Cousinhub mentionned maybe a damaged wire could be the root cause. In the past did you noticed strange lighting behavior or instrument malfunction when using handlebar switches. This could help you to identify the incriminated wire.

Cousin Hubert and Florian are wright. My brother checked the same trouble on his K75 : it was also the primary 12V wire of the ignition coil.
Perhaps could you also check the side stand contact and plug because this is in a serial circuit with the temperature sensor and the throttle positioning sensor - as far as I remember.

Merci pour toutes les reponses recues specialement de Cousin Hub. Ca tourne depuis, pourquoi et pour combien de temps, je ne le sais ?..
Merci a tous.
Gilou7

Hi Gilou

Hi had the same very frustrating trouble for over one year with my K100. Sometimes , it was unable to start, even with spark and gas coming in cylinders. After swapping components (Hall sensors and ignition unit) everything was fixed.... for a few weeks.
I discovered that the problem was fixed not by replacing parts but when moving the electrical harness. I bought a used electrical harness, remove the ignition unit plug with some length of cables and replace mine (soldering and insulating every cable). Everything is great since this time. You are maybe doing the same thing when trying to replace the temperature sensor.
Check every connector and cables.

Ivog57 is wright. It may be the answer.

Sujet nettoyé

Bonjour cousinhub, ici Gilou7 de Floride.
Finalement je suis persuade que c'etait le temperature sensor qui causait le probleme.
avec le 1er (#1), la moto ne demarrait pas...
avec celui d'occasion (#2) ca demarre mais il y a hesitation lorsqu'on accelere.
avec un sutre d'occasion (#3)ca demarre tres bien et il n'y a plus d'hesitation a l'acceleration ?..
Je remets le 1er (#1) moteur froid et ca ne demarre pas mais le fan se met en route ?. ce qui me dit que c'est bien le temperature sensor qui est defectueux.
Je repasse au (#3) et ca tourne sans plus d'hesitation, je crois avoir trouve la cause.
Merci a tout le monde pour votre aide.

Bon eh bien tant mieux si c'est ok. Mais ne perd pas de vue les problèmes connus de faisceau électrique facétieux avec l'âge. En même temps, pour des machines qui ont passé les 15 voire 20 ans, rien de très anormal ...
Bonne route !