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K100-forum.com » Technical, repair and troubleshooting » Electrical » help starting issues

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1Back to top Go down   help starting issues Empty help starting issues Sun Mar 23, 2014 10:52 pm

megamike2193

megamike2193
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I have a 8v k100 that will start but barely ticks over and as soon as you try to rev it cuts out
getting fuel but spark seems weak tested resistance of leads getting the normal 5k ohms but one is reading 103k ohms!!!!!!! so obviously this one is bad but would this be enough to cause these issues I suffering im going to test coils later and chase back issue I will buy some new ht leads and plugs anyway but would really like to nail this on the head anyone any tips advice I would really appreciate anything:-)
cheers
mike

    

2Back to top Go down   help starting issues Empty Re: help starting issues Sun Mar 23, 2014 11:08 pm

Rick G

Rick G
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When you find a problem fix it as that will eliminate that part of the equation. These engines use a wasted spark system in that the plug also fires on the top of the exhaust stroke and as a result a bad lead will affect two cylinders because one coil serves two cylinders.
It could well be the problem but (and isn't there always a but) air leaks in the intake system is a very real possibility as well. Fix the plug lead then if it still is cactus have a look for leaks.


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3Back to top Go down   help starting issues Empty Re: help starting issues Sun Mar 23, 2014 11:14 pm

megamike2193

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yes had a good look for them although some of the rubbers are going to need doing soon theres nothing leaking as yet I even tried running and spray all dodgy looking areas with wd spray to seal to see if engine picked up but nothing
so will try new plugs and leads and go from there
cheers
mike

    

4Back to top Go down   help starting issues Empty Re: help starting issues Thu Mar 27, 2014 1:45 am

megamike2193

megamike2193
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well I thought I fixed 103k ohms on one lead dragging spark down put new lead on fired up great and ran fine
2 days later come to start same problem re checked this lead and is ok now but same issue!!!!!!!!
is coil issue?????

    

5Back to top Go down   help starting issues Empty Re: help starting issues Thu Mar 27, 2014 1:51 am

k75RT Keith

k75RT Keith
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More than likely.  Lead shouldn't fail in days.

    

6Back to top Go down   help starting issues Empty Re: help starting issues Thu Mar 27, 2014 2:04 am

megamike2193

megamike2193
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lead reading fine now but still same barely starts and wont rev.
last time I cut off suppressor cap and just held ht lead close to spark plug and started and ran fine but tried that again this time but doesn't work now!!!!!!
wish I had some spares one to check but might just have to bite bullet and get some newer tested ones
mike

    

7Back to top Go down   help starting issues Empty Re: help starting issues Thu Mar 27, 2014 2:23 am

charlie99

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um ...you didn't think to change the plugs ?


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8Back to top Go down   help starting issues Empty Re: help starting issues Thu Mar 27, 2014 3:07 am

92KK 84WW Olaf

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I had something funny with the LT quite a while back, not so long after a full service. Turned out a dud plug, didn't even do 2,000 miles. They are cheap and seemingly given to failing so I now always carry a spare. The old test of fire it up and see which exhaust doesn't get hot.......Swapped plugs on the first step to see was it going to be coil or plug lead, was a dud plug.


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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
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9Back to top Go down   help starting issues Empty Re: help starting issues Thu Mar 27, 2014 4:37 am

megamike2193

megamike2193
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that's one of the first things I did hadn't it in past on other bikes once you flood them never the same again
I tried it again earlier and hey presto it was fine took it out for run didn't miss a beat will try again over next few days these are the worst problems to diagnose when they don't always do it!!!!
definatly something to do with spark as when it does it the plugs do get wet and when it does go it clears them with a run not like its running rich
mike

    

10Back to top Go down   help starting issues Empty Re: help starting issues Fri Mar 28, 2014 11:16 pm

megamike2193

megamike2193
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Well bike was starting/running fine left it till next day same issues!!! Has anyone had similar issues with hall effect sensor or engine temp sensor????? Really got me baffled this one!!!!

    

11Back to top Go down   help starting issues Empty Re: help starting issues Sat Mar 29, 2014 12:02 am

Garyk100

Garyk100
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I had something similar a few years ago, bike would start but miss badly when you tryed to ride it, new set of leads did not fix it. Turned out to be the fuel filter, changed it and runs well, I put a piece of tube where the filter was, eliminating the filter, it run well, so I bought a new filter, all fixed. Worth a try, cheers Gary

    

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