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[Help] with my '73 DT3 250, having ignition issues
- Lizeec
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Replied by Lizeec on topic [Help] with my '73 DT3 250, having ignition issues
yamaha-enduros.com/index.php/forums/74-7...condenser-relocation
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- 19stuberd
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Replied by 19stuberd on topic [Help] with my '73 DT3 250, having ignition issues
Good news I think? I put in a new spark plug and the bike ran perfectly! I took it for a ride for about 15 minutes, stopped the bike for half an hour, and rode it for another 7 or 8 on my way back home. On the way home I noticed the ignition was becoming a bit choppy again (which is what has happened every time this has been an issue), which leads me to believe that maybe there's something causing the plug to foul prematurely. If I need to test this theory, I thought ahead and bought another spark plug.
Could this be an issue of too much oil being in the cylinder? That would make sense considering the large amount of smoke I mentioned earlier. If this is the case, how do I change how much oil is introduced to the system? Any other thoughts? Appreciate the replies, hope to hear from you all soon.
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- AirborneSilva
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Replied by AirborneSilva on topic [Help] with my '73 DT3 250, having ignition issues
Autolube how to.
1976 DT400C
1981 DT175H
1972 DT2 250
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- Justa73
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Replied by Justa73 on topic [Help] with my '73 DT3 250, having ignition issues
- dt1-dt250.........1968-71
- dt2-dt250.........1972
- dt3-dt250.........1973
- mx250..............1970-71
- dt250................1974-78
- Check the link to his store on the right side of the page.
- Sorry this will not let me post a link to ebay. Search 1973 dt3 250 condenser and points. mine have not arrived yet
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- Justa73
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Replied by Justa73 on topic [Help] with my '73 DT3 250, having ignition issues
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- AirborneSilva
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Replied by AirborneSilva on topic [Help] with my '73 DT3 250, having ignition issues
1976 DT400C
1981 DT175H
1972 DT2 250
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- 19stuberd
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Replied by 19stuberd on topic [Help] with my '73 DT3 250, having ignition issues
So I took the cover off of the oil pump and it was FULL of water. I don't know how that's even possible but I would imagine that might be indicative of an issue? Also noticed that there's air bubbles in both of the oil lines and I believe the tank is low, so good thing that I checked. I took a video of the pump uncovered while the bike was running, so you guys can let me know if it looks normal or if it's pumping slower or faster than expected. I'll do a flow check soon with a syringe and verify the theory that it's over-oiling, but if you guys see anything immediately wrong please let me know.
photos.app.goo.gl/mzBpctgGMUxspFSq5 - illustrating excessive smoke produced. Also, the thick smoke actually leaks out before the exhaust pipe, illustrated at the end of the video, so that contradicts RT's theory of stuff burning inside the pipe. Also not sure if it shows up well on video but it's literally a could of smoke that encompasses the next two houses downwind of me.
photos.app.goo.gl/EJhMJhDYNEH2B2k96 - water discovery, sorry for the swearing, I wasn't thinking about me posting this here
photos.app.goo.gl/ZT85BNnYjnpCnPMS8 - pump while running. notice the already choppy ignition as well as the bubbles in both lines.
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- AirborneSilva
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Replied by AirborneSilva on topic [Help] with my '73 DT3 250, having ignition issues
1976 DT400C
1981 DT175H
1972 DT2 250
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- 19stuberd
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Replied by 19stuberd on topic [Help] with my '73 DT3 250, having ignition issues
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- 19stuberd
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Replied by 19stuberd on topic [Help] with my '73 DT3 250, having ignition issues
TL;DR Pump was broken. Fixed it. Rode it. Bike broke again, being weird, look at video.
So since our last installment, I determined the oil pump was misadjusted and at idle it was putting out 5x too much oil. I adjusted it to spec and suddenly my white death clouds disappeared! The bike ran famously, I took it to a park and rode it for a good half hour one day, started it the next day to ride to the shop 20 minutes away to get a new spark plug, got the plug, and it stopped dead as I was riding away from the shop. I gapped and swapped the plug and it did not help.
I kicked the bike once after it sat for a couple hours and it sat and idled for a good two minutes without issue, before entering the state in the video. I took it home and it's still doing it now, no idea what the issue is. Any thoughts are greatly appreciated, thanks in advance for the help.
photos.app.goo.gl/VhneqqAw1YQq9Z4v8
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