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YFM250 Moto 4 - Breathing new life.....help?
By
pokolbinguy, in Yamaha ATV Forum
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By Dwight Williams
Hey everyone, I've been scratching my head over this for most of the day. I bought a couple of Bayou 220's, got them running (they've both been sitting), and started tweaking and fixing small things. One of them is mostly done, the other had an aftermarket carb on it and I've been trying to sort that out.
Anyway, while adjusting the carb it died a few times, I restarted and moved on until it died and wouldn't restart. I figured maybe I'd flooded it or something - after further attempts I realized I had no spark. Since I have two identical machines I have many parts at my disposal. I've swapped the CDI, spark plug and coil with no luck. I have good resistance readings from the stator and pick up (135 and 110 respectively), I don't have a peak voltage meter but I measure around 53VAC on the stator when cranking. I have a 4 wire stator, not an alternator like the newer ones. Grounds look good, I've checked the kill switch by verifying that it and the ignition switch grounds the black/yellow wire to the CDI. I can turn the engine slowly and see the pickup short the meter as well, seems normal right? So far everything I've checked looks the same on both machines. I've got the service manual and wiring diagrams. Do these readings make any sense? I'm obviously missing something but I'm stumped. thanks!
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By Jeff Comstock
Ok, so I had no spark issues and foundy coil was bad. Bought a caltric coil, put it on and fired right up...for bout 20 minutes then it backfired once and again, no spark. I put it on my buddies 300 and it runs. Checked my cdi the same thing, but still no spark. Now I got my old coil and was ohming it and got reading of .01 on primary and 11.89 from POS to plug ( meter set on 20k ) new coil reads same primary but 12.83. what gives? It tests bad but runs my buddies 300, helllllllpppp
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By Daniel Gibson
Have a 08 raptor brought to me a couple months ago. Got it on a trade for house remodel. Bike has around 30 hours. No that's not a typo thirty verifiable hours. The main Yamaha tech has put hands on this bike. Always Been reallyhard to start. If it does it runs really good. That's the kicker...IF! It started out intermittent now it's no spark at all. Everything ignition related is brand new. It all checks out good but still won't do it. Please help
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By mywifeknowseverythin
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