jstubb

The bike turns over all the time without a problem, it looses spark when it cools down. I have been doing comparison testing since my shop is cool and I can easily warm up the engine compartment. So far I haven't been able to find any differences between warm and running and cold and no spark. I think my next step is to remove the TCM and see if I can find out anything with it unless someone has a better suggestions.

Hi all, Thanks for the replies and taking the time to try and help me figure out my issue. My shop is dark and I tried starting it cold and there are no sparks or glowing anywhere. I have all the covers and fairing off so it is easy to see. I put the heater on it and warmed it up to between 75 and 80 degrees, (temp determined with a laser thermometer) and it started right up. I checked all the engine compartment again while it was running for any sparks or glowing and none showed. I checked the resistance of the plug wires and all were within tolerance, the plugs were all good and properly gapped and work well when there is spark and the boots are in good shape. I had one suggestion that it might be the TCI (transister controlled ignition) unit, something in there is either loose or broken and the heat makes it expand enough to make contact again. I was hoping someone out there may have experienced the same issue and had a good fix. Is anyone aware of a good source for electrical parts for these bikes? I also found a great download site for a factory service manual that had some fun information and it was totally free and I would be happy to share it with anyone interested. Again, thanks for the time you all have given me and thanks for the welcome to the site. Hopefully some day I can repay the kindness.

Hey folks how are all of you? Thanks for reading this, I am a bit confused. My bike has run without a hitch since I bought it four years ago, until this spring. I rode it a couple of times and no problems and the other day I took it out of the garage and it wouldn't start. The fuel pump was working fine and I was in a hurry to get to my destination so I left the bike out in the sun. When I got back it had warmed greatly from being in the garage and it started right up and ran great! I rode it a minute and tried starting it again and it worked fine. I parked it in the garage and the next day I tried starting it again in the cool garage and it wouldn't start. I started testing and I had no spark at the plugs. I talked to a small engine mechanic friend of mine and he suggested warming it up with a heater and seeing if it started and low and behold as soon as it warmed up quite a bit it had spark and started again. Is there anyone out there that might know the cause of this and where to get the parts to fix it? Thanks for your help. And BTW, this is a '90 VR.