Single Mikuni on 850 Interstate

Craig 

I also run a single vm36 Mikuni on my 850 commando

My kit came from allen performance

Heres a useful guide hopefully

Steve

Craig

My trick for starting /running this set-up 

1/ kick through a few times to free clutch

2/petrol on carb enrichment lever down then a few more kicks

3/ ignition on start her up, I then screw in the throttle stop screw(big brass thumb screw l/h side) half a turn and pull the enrichment lever up (the off position) after she has warmed up a little you can back out the thumb screw to get the idle you want

I generally use the enrichment lever even on a warm engine.. as soon as it starts lever off (up)

hope this helps 

Steve

Hi Craig

I have found these people helpful for Mikuni parts

http://www.motocarb.co.uk

Steve

I run a Mikuni VM36 too. Will nip out to the garage & check what settings\specs everything is.

Would also recommend Steve @ Motocarb in Liverpool.

1974 Norton 850cc Commando MK2 Roadster with a Mikuni VM36:

Throttle Valve - 2.5 (2.5)

Main Jet - 290 (260)

Pilot Jet - 35 (30)

Jet Needle- 6DH3 (6DH3)

Needle Jet - 159 P-2 (159 P2)

Needle Seat - 33 (Unsure what this is? Float valve? 3.3?)

(Main air jet - 2.0)

(Air adjuster screw: 3 half turns out)

(Idle adjuster screw: 9 half turns out)

I've just put my specs in brackets by the side of yours to make reading it a little easier! I'm also based in England so similar altitude/environment etc.

I haven't long had it set up like this & haven't ridden it a great deal either to really test it out - my plugs look a little rich still so I'm going to try screwing the air adjuster screw in 1/4-1/2 turn to see if it leans up the mixture a little.

https://youtu.be/T2w-vSyA4eQ

I dialled the air adjuster screw back by a 1\4 turn & fitted my new Andover downpipes & silencers. Had a good hour ride around Warwickshire this morning & that's the best she's ever ran, without a shadow of a doubt. Really chuffed.

I too am a member of the 'VM36 Club' here is what I have

Main Jet: 280

Pilot Jet:    35

Needle Jet:    P2

Needle: 6DH3

Clip Position: 2

Air Jet: 2.00

Slide: 2.50

Tri Spark EI,  K&N RC-0850 Air Filter ,  straight through pea shooters.
Warm starting and normal running are good, but like others the on/off enricher makes the transition from cold starting to normal idle a bit hit or miss. If I get it wrong the plugs need cleaning.
I am going to try a 32.5 pilot Jet next. Reading the various Mikuni tuning guides online, they mention treating each circuit (Main,Pilot etc) as a separate setup.