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  #1  
Old 2 Weeks Ago
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Default Putting Mikuni back on

After having difficulty kick starting 76 XLCH with butterfly Keihin thinking I had static timed correctly I switched to VM38-9 after reading it was easiest for kick starting. Still hard starting. Put Keihin back on. After discussing with a friend he suggested holding point cam full advance and rotating plate until points just open and lock it down, worked great one or two kicks cold, hot-warm starts once I got technique down pretty good. Going to put Mikuni back on to see if there is less drama hot starting. Will report back.
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https://m.youtube.com/watch?v=mKVh4pbyh2A

Static time per this video. The VM38-9 is a 1-3 kick carb that doesn't require a technique other than choke when cold.
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The only Mikuni technique = do not open throttle while cold starting or the enrichener doesn't enrichen.
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And the idle mix screw works backwards.
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Mikuni is on using Branch backing plate with stock cover, air screw set at one turn out, idle set at 1k RPM ( after warm up ). Tried starting as recommended no prime kicks or throttle, enrichener lever down, no go. Kicked few more times no start. Kicked 3-4 times ignition off WOT, closed throttle, ignition on lever down one kick fired up, went for 15 mile ride, idles even, pulls well and definately smoother over 60 mph. Shut it down let sit for 20 minutes or so, tried just kicking no start, shut ignition off 2 kicks WOT, ignition on, no enrichener, one kick fired up. For some reason cold or hot it wants cylinders cleared out, I can live with that.
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Whenever I've had starting issues like you describe its because the points aren't right or crappy gas.
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Quote:
Originally Posted by Whitewalls View Post
Whenever I've had starting issues like you describe its because the points aren't right or crappy gas.
Have 50/50 mix of unleaded 93 and Cam 2 leaded 110 octane in tank, points at .018 both lobes.
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Quote:
Originally Posted by mvent View Post
Have 50/50 mix of unleaded 93 and Cam 2 leaded 110 octane in tank, points at .018 both lobes.
timing? push rod adjustment? no intake air leaks?
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I've come to the conclusion that even with petcock off, I believe fuel is getting into cylinders because of the lean angle requiring cylinders to be cleared out before starting. I let it run for a few minutes with petcock off before restarting and that seemed to work, fired up warm 1 kick.
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Success!!
I usually have to open the throttle slide a little when doing the first start of the day, then as I ride along and the engine warms up I can turn the idle screw back out and reduce the rpms as the engine will be racing when I come to a stop.
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