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| Bike runs but dies http://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=30&t=1583 |
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| Author: | dale_jr_008 [ Sat Sep 22, 2007 3:54 pm ] |
| Post subject: | Bike runs but dies |
1978 KM100, bike will run perfect untill it is warmed up(run for 10-15 minutes) Then it sounds like it starts to miss then backfires and dies. Gas is premixed at 20:1 with the injector holes blocked off. New piston and rings put into it yesterday, along with new crank bearings and seals. When I first got the bike a month ago, it did the same thing and I checked the carb and everything is up to snuff. I think it has to do with the eletrical. Any info will be appreciated. |
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| Author: | Stephen [ Sat Sep 22, 2007 9:45 pm ] |
| Post subject: | Re: Bike runs but dies |
Some coils that are going bad tend to act up once they get warm. Are you still getting spark once it dies? |
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| Author: | dale_jr_008 [ Sun Sep 23, 2007 5:04 am ] |
| Post subject: | Re: Bike runs but dies |
It seems to get smaller when it's warm. |
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| Author: | ricortes [ Wed Sep 26, 2007 8:56 pm ] |
| Post subject: | Re: Bike runs but dies |
It may sound silly but try taking the gas cap off when it happens. Sometimes the vent blocks and they pull a vacumn. Rick |
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| Author: | dale_jr_008 [ Thu Sep 27, 2007 4:28 pm ] |
| Post subject: | Re: Bike runs but dies |
Thanks, will give it a try. Also I just put new points in it, no change. But I have a condensor supposed to be coming in next week for it and if that fails, what next??? |
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| Author: | Stephen [ Thu Sep 27, 2007 8:54 pm ] |
| Post subject: | Re: Bike runs but dies |
Here's a quote from Dan's On Line Motorcycle Repair Course It is no substitute for the correct repair manual for your bike, but gives some sage advice on a lot of topics. Quote: Ignition coils. Measure the resistance between the primary (low-tension) wire and ground or ground terminal. It should be very low. Like .5 to 1.5 Ohms. The primary wire is the small wire going to the CDI box or points. Next measure the secondary (high-tension) wire and ground. (Note that on most bikes these days, the coil mounting bar, that passes through the coil and mounts it to the frame, is the ground for the coil primary and secondary wires.) This should be quite high, like 6000 to 13000 ohms. If the coil is out side the specs given in the shop manual the coil might be bad. Sometimes, a coil will work OK when cool but fail when it warms up. Let them cool and they work again.
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