Why?

capehorner · Apr 7, 2013

Why can't I get my bike started without starting fluid when it has sat for a few days. Once started it's so easy to restart, even the next day. 75 Commando with Mikuni single. Carb has been rebuilt, bike is tuned up...WTF

swooshdave · Apr 7, 2013

Timing, starting circuit on carb.

Hobot · Apr 7, 2013

First thing the occurs to me is float level a bit too low. Proper tune will require some enriching for first cold start, ticked or chocked or spritzed aerosol. Check for possible air leaks and of course the ever famous pilot jet cruded up.

concours · Apr 7, 2013

capehorner said:
Why can't I get my bike started without starting fluid when it has sat for a few days. Once started it's so easy to restart, even the next day. 75 Commando with Mikuni single. Carb has been rebuilt, bike is tuned up...WTF

Don't take offense, don't know how long you've had the Mik. New problem? Always been like that? Very important with a Mik to crank with the throttle COMPLETELY CLOSED and the enrichener (choke) on. Opening the throttle even the smallest amount kills the ability to draw fuel in.

DogT · Apr 7, 2013

I'll go with hobot, low float. Does it tickle good? If not, low float.

Dave
69S

splatt · Apr 8, 2013

Sump full of cold thick oil ?

rpatton · Apr 8, 2013

splatt said:
Sump full of cold thick oil ?

+1 Been there. One more reason to go with a good synthetic multi 8)

Guido · Apr 8, 2013

rpatton said:
splatt said:

Sump full of cold thick oil ?

Click to expand...

+1 Been there. One more reason to go with a good synthetic multi 8)

+2 Went from 50w to 30w. Starts easy now but this summer will be back to 50w.

edgefinder · Apr 8, 2013

VM Mikuni should have a starter jet at the bottom of the long tube like hole in the float bowl. Drill jet bigger till choke works. Another bike I got TM Mikuni's. It came with 15 starter jet. I ended with hole twice as big or 4 times volumne before it worked good.