Posted July 2, 20204 yr I have a '94 YZF750R that won't start when it's cold. It turns over but never catches. If I remove the airbox and place my hand on the carbs to choke it, it comes to life, telling me that it is too lean and not getting fuel. Is this correct? I would like to note that the choke was fully engaged when I start it.
July 2, 20204 yr Author It's on the frame below the tank on the left side of the bike (shifter side). I can hear a click in the carbs when I pull it.
July 3, 20204 yr Author I honestly can't tell you. I received it from my neighbor...someone abandoned it in his yard, but it had a clean vin and I got a salvage title for it. I did have it running about 4 weeks ago, but that required copious amounts of starter fluid. Once it warmed up, it idled fine at 1150 and would start up if I turned it off.
July 4, 20204 yr I'd say the carbs need taking off then, and a good clean. The choke circuits are probably blocked. If you can find somewhere that does ultrasonic cleaning I'd recommend that
July 4, 20204 yr 3 hours ago, finnerz89 said: I'd say the carbs need taking off then, and a good clean. The choke circuits are probably blocked. If you can find somewhere that does ultrasonic cleaning I'd recommend that Clean the tank as well if that has been lying I assume there will be rust inside. I've used a length of light chain, but others use nuts and bolts or small stones. Fit an inline fuel filter as well
July 5, 20204 yr Moderator Yep, as said. Clean carbs and good fuel in this situation. No short cuts either.
July 5, 20204 yr Author Update: I replaced the oil, coolant, and put good fuel in it. After a little coaxing, I got it idle nicely and let it run for 3 hours ( I made sure the temp was always in the normal range). I think it managed to clean out the minor gunk by itself because like I said, this bike was running before it was abandoned. It's been 2 days since my last post and she starts very nicely now...hot or cold....usually no more than 3 cranks if even that. Next thing to see is if I can tighten the clutch...it doesn't disengage all the way.
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