Mikuni Carb Jetting Suggestions Please

[old trials fanatic]

Finally got around to getting the old 199B 340 Sherpa running again. Trying desperately to sort out the "projects" worth persevering with and getting rid of everything else.

So fitted the new VM28 carb thats been sitting in the draw for the past 18 months but the carburation just seems a bit off.

The carb has been jetted to suit a 340 199B but thats always a bit of a guess so i'm wondering if anybody has fitted a VM 28 and got it running spot on and if so what jets they are using.

From memory the jets in it are as follows

Main 130

Pilot 35

Needle jet N8

Needle 5DPJ i think

Slide is 2.5

The pilot feels a bit too lean especially as the only way i can get it to be anywhere near is with the airscrew 1/4 turn out, not much of an adjustment is it?, plus the off idle feels a bit iffy too. Think it may need a 2 slide but before i go spending money i dont have much of at the moment I would like to know what other people are using.

Thanks in anticipation.

Edited June 15, 2010 by Old trials fanatic

[triple_x]

Hi

I had a similar problem with my VM26.

I had a 35 pilot and it would only run with the screw 1/4 turn out.

I changed to a 37 and the bike runs sweetly on around 1 turn out, and starts easier when cold as well.

Hope this helps but bear in mind my Sherpa is a 250.

Martin