Fritzer108 Posted July 2, 2020 Posted July 2, 2020 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.
finnerz89 Posted July 2, 2020 Posted July 2, 2020 Is the choke lever on the bars? Is it actually doing anything at the carbs?
Fritzer108 Posted July 2, 2020 Author Posted July 2, 2020 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.
Moderator Cynic Posted July 3, 2020 Moderator Posted July 3, 2020 When was the last time it started normally?
Fritzer108 Posted July 3, 2020 Author Posted July 3, 2020 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.
finnerz89 Posted July 4, 2020 Posted July 4, 2020 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 2
jimmy Posted July 4, 2020 Posted July 4, 2020 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 1
Moderator Cynic Posted July 5, 2020 Moderator Posted July 5, 2020 Yep, as said. Clean carbs and good fuel in this situation. No short cuts either.
Fritzer108 Posted July 5, 2020 Author Posted July 5, 2020 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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