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bad idle

PostPosted: Tue Apr 13, 2010 9:38 am
by Pezza
any one know how to get a bonnie to idle beter? it idles fine for a while but then it starts to run rough, any one have mikuni's fitted and how are they? does the bike run better?

Re: bad idle

PostPosted: Tue Apr 13, 2010 8:56 pm
by GNC
I got the MK2s running pretty well on mine. does it seem rich when rough idle happens? Maybe have a look at condition of choke plungers rubbers my were shagged
old vs new

Image

Re: bad idle

PostPosted: Tue Apr 13, 2010 9:32 pm
by Bill
Fit AMAL's.. :205

:150

Re: bad idle

PostPosted: Wed Apr 14, 2010 5:47 am
by MOUSE
These are MK2 Amal Bill.
Good pic GNC Yep, they can cause bother those rubber seals, you can turn them over - bodge, but much better to replace. I had worn brass retainers and you have to ensure the ones you replace with are exact as fitted. There were two made of different lengths, one of these doesn't work properly.
Modern gas seems to perish them quicker as well as the intake rubbers. You can get ones for "alcohol" running and they last longer.
Know ziltch of Mikuni but have read somewhere they are less problematic for wear and are great if tuned correctly.
I think they are bit of a pain to set up on OIF if head isn't splayed ?

My solution was to fit a Tiger head and single carb MK1 Amal with chrome slide, and no choke. May have been a bit extravagant but end of carb probs and tuning/ syncronising issues,bike has more torque.

Dodgy idle may not necessarily be a carb problem, but replace rubbers and see what happens?

Re: bad idle

PostPosted: Wed Apr 14, 2010 9:06 am
by Pezza
sorry forgot to mention that they are mk 1's and no choke don't need it here :501

Re: bad idle

PostPosted: Wed Apr 14, 2010 10:02 am
by MOUSE
check settings that affect idle i.e pilot jets are not blocked, air screw adjustment when motor warm, then perhaps float levels if needed.

http://sterlingmotorworks.com/amal_carb ... uning_tips

Re: bad idle

PostPosted: Wed Apr 14, 2010 10:26 am
by Pezza
Thanks Mouse and every one else :155 I'll have a peek on Friday! :208