Baron PMS screw is different.

[Druegeme]

about two weeks ago I just re-jetted the carb for my 2006 1700. I got the Baron jet kit, per recommendations put the 172.5 main and 40 pilot jets in, stock PMS 2 1/2 turns out. Ran great right away, pretty much perfect maybe a little rich. Needed enricher halfway out for about 5 minutes, then ran happily. Black dust in exhaust but not oily. No backfiring. Awesome.

But I still had that Barons PMS screw on order, Part No BA-2150-00.

I thought it would be a good idea, just to dial it in perfectly. Finally got the Barons screw. I compared it to the stock PMS screw and it seemed the same tip. I put it in, again 2 1/2 turns out like before, and went for a ride.

It was running rich, I could tell right away just from the smell. Didn't need much enricher. Smelled like a fuel truck, oily black in the pipes. Back home I turned the screw in, engine running. It didn't do much. Turned it all the way in, didn't seem to do anything. Went for a ride again. Rich and stinky.

I took the screw out and compared it more carefully to the stock PMS screw. Especially the tip, or the needle, the thing that goes in the butt of the pilot jet.

Stock pilot screw tip: 1.00mm front to back, length 3.5mm. A perfect cylindrical shape with 1.00mm diameter.

Barons pilot screw: 0.9mm at the tip to about 1.12mm at the bottom.. A conical shape. Under a magnifying glass I could see it. Conical.

So I put the stock PMS screw back in, 2 1/2 turns out. Rode it. Much better, no stink. With hot engine running, I turned it in slowly. About 1 turn out the engine starts coughing, all the way in the idle goes down and it seems to almost stall. What I expect. Turned it back out and found highest idle about 1.5 turns out, turned it out a bit more and that was it.

Long story short- the Barons PMS screw is different. For me it doesn't work at all.

[Lug Nut]

Are you 100% sure that you had the spring/washer/outing transfered over to the Barons adjustable thumb screw pms???

[brianmac]

yep, it is different, but it works, dont instrux state that ?? i do remember reading its different, so makke aure all the springs and rubbers are there, and you dont have a cracked rubber oring, adjust it

[Druegeme]

yes I used the washer and oring correctly. I'm not sure the instructions say that the tip is shaped differently. In my case it didn't work that I am sure of.

Maybe I got a bad one. I thought I post this in case someone has the same problem and cant figure out why turning the pms doent change anything and the bike runs rich no matter how you set it.

I remember seeing a thread here from 2018 where someone asked the question.

[Lug Nut]

I've had them work fine before and I had one that came loose and fell out lol. I just used the stock when anymore set it at 2 and 1/2 turns out and be done with it

[Horsehammerr]

This sounds like EXACTLY my problem ! I'm going to pull that Mother out and see if all the parts are even there . Probably easier With carb. on bench .

[roadiemort]

Sounds to me that the inferior parts are now of Chineseum quality not like years ago.

[Horsehammerr]

We'll see

[Druegeme]

This sounds like EXACTLY my problem ! I'm going to pull that Mother out and see if all the parts are even there . Probably easier With carb. on bench .

you can do it with the carb halfway out just just take it out of the intake flange and loosen throttle. Gives you enough room to turn it upwards.

[Horsehammerr]

Is the " O " ring that sets on top of the metal washer the same size as the washer ?? I seem to have lost mine , or I never put it in there .

[Druegeme]

yes it seems to be exactly the same diameter as the washer.

[Horsehammerr]

Is it a pretty narrow Gauge ?

[brianmac]

if you have your idle screw adjuster open too much, bike will run on the main jet, and pms may not do much if at all, usually u can see gas coming out of main jet when this happens, lower idle adjuster