classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: ianmac on December 18, 2018, 01:53:30 PM

Title: ariel arrow/leader-mikuni vm26 jets/settings
Post by: ianmac on December 18, 2018, 01:53:30 PM

HI
  Iam fitting a mikuni carb to my BSA BLEADER(ARIEL ARROW ENGINE).Can any-one who has already done this let me know the jetting/set up they are using?

Title: Re: ariel arrow/leader-mikuni vr26 jets/settings
Post by: TGR90B on December 19, 2018, 11:19:05 AM

Easier to fit the correct Monobloc.

Title: Re: ariel arrow/leader-mikuni vm26 jets/settings
Post by: ianmac on December 20, 2018, 09:43:12 AM

hi
 leaders/arrows are well known for poor HOT STARTING,a problem that i have!reading various articles regarding this,, the majority
say fitting a mikuni eliminates this problem+easier starting,&smoother idle.
    IAN

Title: Re: ariel arrow/leader-mikuni vm26 jets/settings
Post by: 33d6 on December 20, 2018, 12:23:59 PM

Personally I follow the old saying that most carburettor problems are ignition, and to me poor hot starting sings of ignition problems.

Cheers,

Title: Re: ariel arrow/leader-mikuni vm26 jets/settings
Post by: ianmac on December 20, 2018, 12:48:51 PM

i have  fitted pazon ignition system &set timing as advised.this is a common problem on this engine as many owners have high-lighted
&on the old ariel leader/arrow forum this was discussed&the best solution was fitting a mikuni &achieved the desired effect-better
all round running &especially eliminates the hot start problem

Title: Re: ariel arrow/leader-mikuni vm26 jets/settings
Post by: iansoady on December 20, 2018, 01:33:20 PM

Although I didn't have it for long, my Arrow started perfectly happily when hot with its original Monobloc. Poor hot starting is often caused by heat soak into the carb. Do you have the proper insulator between carb and crankcase?

Have you tried the AOC forum for information?

Title: Re: ariel arrow/leader-mikuni vm26 jets/settings
Post by: Rex on December 20, 2018, 03:33:54 PM

I suppose then the easiest thing would be to ask on the Arrow forum what settings have been found to be acceptable?  :-\

Someone must have experimented to find those optimum settings if it's a common mod, and that seems to be the problem with things like Mikuni carbs, namely great when they're "dialled in" but worse than standard until that time.