1 '87 K100 No Start Issue Sun Jul 10, 2022 10:46 pm
vttownie
active member
Hello all,
I've been working on this '87 K100 RS since I purchased it in January. I've found a lot of people's threads helpful in getting to where I am now, but I need some help diagnosing a current issue that's been causing me plenty of headaches as I am an inexperienced mechanic.
The primary issue of the bike when I purchased it was a major oil/water pump leak, which required a replacement of the entire unit (the last owner installed a k1000 pump and the seals broke). The bike then moved and rode just fine with only a few leaks as I reinstalled all of the gaskets and rubber bits that held the engine cases together. However, during the first ride I stalled the bike during gear shifts (I am also an inexperienced rider) and since recharging the battery it has not started. I replaced the throttle housing tubes (everything connecting the airbox to the engine) because they had all sorts of holes in them, but the starting issue has not changed.
When pushing the starter button, the engine cranks enthusiastically but does not turn over. Giving it choke only changes the rhythm of cranking as far as I can tell. The fuel pump does make noise. The spark plugs do give spark but when I pull them after a long attempt they are a little wet. One time, when starting, the exhaust flooded with fuel, which to me indicates either a pressure issue or a temperature sensor issue. I took a look at the temp sensor and it did have corrosion on the outside, but it still confuses me why the bike started so easily prior to the stall and does not afterwards.
Apologies for the long post, but I have spent a long time working on it and am ready to ride! my local parts dealer certainly will be happy to work on it... but if a little cleaning or wiggling of wires gets it to go I would be happy to hold off on the pricy visit.
Any advice on what to check is appreciated.
I've been working on this '87 K100 RS since I purchased it in January. I've found a lot of people's threads helpful in getting to where I am now, but I need some help diagnosing a current issue that's been causing me plenty of headaches as I am an inexperienced mechanic.
The primary issue of the bike when I purchased it was a major oil/water pump leak, which required a replacement of the entire unit (the last owner installed a k1000 pump and the seals broke). The bike then moved and rode just fine with only a few leaks as I reinstalled all of the gaskets and rubber bits that held the engine cases together. However, during the first ride I stalled the bike during gear shifts (I am also an inexperienced rider) and since recharging the battery it has not started. I replaced the throttle housing tubes (everything connecting the airbox to the engine) because they had all sorts of holes in them, but the starting issue has not changed.
When pushing the starter button, the engine cranks enthusiastically but does not turn over. Giving it choke only changes the rhythm of cranking as far as I can tell. The fuel pump does make noise. The spark plugs do give spark but when I pull them after a long attempt they are a little wet. One time, when starting, the exhaust flooded with fuel, which to me indicates either a pressure issue or a temperature sensor issue. I took a look at the temp sensor and it did have corrosion on the outside, but it still confuses me why the bike started so easily prior to the stall and does not afterwards.
Apologies for the long post, but I have spent a long time working on it and am ready to ride! my local parts dealer certainly will be happy to work on it... but if a little cleaning or wiggling of wires gets it to go I would be happy to hold off on the pricy visit.
Any advice on what to check is appreciated.