ninjette.org - View Single Post - New 250 owner. Idle hangs at 4,000 rpms. Carb issue?

jkv45 · September 1st, 2015, 09:38 AM

I would leave the mixture screws at 2.5 for now.

When you are cranking, open the throttle slightly - like 1/16 to 1/8 turn - and see if it fires up. You may need to adjust the hot idle speed or add some throttle manually to keep it running initially.

It's also possible you are using too much choke (enrichener) - try backing it down. The idle mixture may be rich enough now that you don't need as much as you are familiar with.

It does take some cranking to get enough vacuum for the petcock to flow, or you can apply vacuum directly to it to speed up the process (though I don't think that's the issue).

September 1st, 2015, 09:38 AM	#14
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	I would leave the mixture screws at 2.5 for now. When you are cranking, open the throttle slightly - like 1/16 to 1/8 turn - and see if it fires up. You may need to adjust the hot idle speed or add some throttle manually to keep it running initially. It's also possible you are using too much choke (enrichener) - try backing it down. The idle mixture may be rich enough now that you don't need as much as you are familiar with. It does take some cranking to get enough vacuum for the petcock to flow, or you can apply vacuum directly to it to speed up the process (though I don't think that's the issue).