Guys... HSR 45 carb, no air leak, 97 needle 2 groove, 167.5 main, 50 accel pump nozzle, stock 25 pilot.
When I turn PMS in from 1 1/4 turns and less RPM drops but when 2, 3, 4 or more turns even 5 turns out it's still 900 RPM on tacho, RPM never drops when I turn OUT pms.... what to do ? I ordered 22.5 pilot jet. Sounds ok ?

Don't forget that turning it out on an HSR carb is leaning it out. It is not changing because it has already found its leanest spot at the 1 1/4 area. Why do you want to turn it out more than that? If you put a leaner 22.5 pilot jet in there you won't be able to adjust it out as far as you are. If anything you may need to go larger if you are having any issues. With a 06 1700 your jetting configuration is already very lean on all circuits.

How do I know 1 1/4 is leanest spot ? Mikuni manual says turn out till stumble but it never stumble.
1 1/4 turns on PMS or less is rich - RPM drops instant so where to leave PMS ? 2 turns ?

1. If the best idle is achieved with the air
screw less than one turn out, the pilot jet
is too small and should be exchanged for
a larger one.

2. If the engine speed does not slow after
two-and-a-half turns out, the pilot jet is
too large and should be exchanged for a
smaller one.

You are not necessarily gonna get a lean stumble when turning it out. When you get to the point of no more change in idle that is your leanest point. The tuning manual is a good guideline but isn't a bible to the exact reaction of every carb and situation. It also is open to interpretation. Everyone I have seen use that manual as a bible to tuning is tuned to the lean end of tuning. I have been working with one of the members recently that has an hsr carb that was tuned according to the manual. He has just installed a AFR gauge and found the carb extremely lean, as far lean as AFR's in the 16's at a cruising speed and he had the needle set on the 2nd groove like you have. When he changed the needle to the 3rd groove it put him in a better spot across the board in all ranges.

davej wrote:
Don't forget that turning it out on an HSR carb is leaning it out. It is not changing because it has already found its leanest spot at the 1 1/4 area. Why do you want to turn it out more than that? If you put a leaner 22.5 pilot jet in there you won't be able to adjust it out as far as you are. If anything you may need to go larger if you are having any issues. With a 06 1700 your jetting configuration is already very lean on all circuits.

I agree with Dave here - you are already running lean in all the circuits - check my jetting for example - my plugs are golden tan and no soot in the pipes. My 1600 runs strong through the rpm range and idles smoothly at approximately 900-950

NJ

Och I think I found it :
"The tuning manual that now ships with the Mikuni's has changed the instruction for tuning the pilot jet air screw. They now say to turn the screw in until the engine stumbles, then out until a smooth idle is achieved."

I tried 3rd groove with 167.5 main,170 and 175, bike felt sluggish at top end with 110 max speed where on stock CV with 167.5 main 120 mph no problem.

Part of your issue of not getting a lean stumble is likely that your throttle plate (idle screw adjustment) is where your idle fuel is coming from and it is over riding the pilot adjustment for the lean stumble.

Mikuni uses 2 turns out as their start point on pilot screw. Go ride and get engine up to temps (15, 20 min. ride) Should you need to change pilot jet, go back and set the pilot screw to 2 turns out. With this carb, anytime you change pilot jets, you need to start pilot screw at 2 turns out.

Slowly turn screw in till a change, slowly turn screw out till a change, now set it in the middle of those 2 points. If this point is less than 1 turn out, then pilot is too small, need bigger pilot jet. If this point is more than 2.5 turns out, then pilot jet is too big.

and from what it sounds like, you need to go to a smaller pilot jet.
.
Everything in the Mikuni manual is accurate, because I tried it all and ran exhaust gas analyzers to confirm. I jetted the 42hsr carb at least 20 or so times, just for the "what will this do" factor, and ran about half of those different jettings on a exhaust gas analyzer. The only thing different between the 2 carbs is size, the 45hsr can be a bit overkill on a engine with no mods, but it still is doable.

After all is set and done, and performance is good on a fully warmed engine, start to learn how the bike operates when the engine is cold.

Erbman02 wrote:
Mikuni uses 2 turns out as their start point on pilot screw. Go ride and get engine up to temps (15, 20 min. ride) Should you need to change pilot jet, go back and set the pilot screw to 2 turns out. With this carb, anytime you change pilot jets, you need to start pilot screw at 2 turns out.

Slowly turn screw in till a change, slowly turn screw out till a change, now set it in the middle of those 2 points. If this point is less than 1 turn out, then pilot is too small, need bigger pilot jet. If this point is more than 2.5 turns out, then pilot jet is too big.

and from what it sounds like, you need to go to a smaller pilot jet.
.
Everything in the Mikuni manual is accurate, because I tried it all and ran exhaust gas analyzers to confirm. I jetted the 42hsr carb at least 20 or so times, just for the "what will this do" factor, and ran about half of those different jettings on a exhaust gas analyzer. The only thing different between the 2 carbs is size, the 45hsr can be a bit overkill on a engine with no mods, but it still is doable.

After all is set and done, and performance is good on a fully warmed engine, start to learn how the bike operates when the engine is cold.

I know the carb that Jim has I believe from your old bike was way off to the lean side. I was told that the pms at 2 turns out the AFR was in the 20's @ idle and the carb was in the 15's at 70-72. that is not where the tuning manual says to be. If you are getting more than about mid 40's mpg at 70 mph you are a lot leaner than the 14AFR the tuning manual calls for. And I believe you always claimed up to 50mpg. You were lean.

davej wrote:
Erbman02 wrote:
Mikuni uses 2 turns out as their start point on pilot screw. Go ride and get engine up to temps (15, 20 min. ride) Should you need to change pilot jet, go back and set the pilot screw to 2 turns out. With this carb, anytime you change pilot jets, you need to start pilot screw at 2 turns out.

Slowly turn screw in till a change, slowly turn screw out till a change, now set it in the middle of those 2 points. If this point is less than 1 turn out, then pilot is too small, need bigger pilot jet. If this point is more than 2.5 turns out, then pilot jet is too big.

and from what it sounds like, you need to go to a smaller pilot jet.
.
Everything in the Mikuni manual is accurate, because I tried it all and ran exhaust gas analyzers to confirm. I jetted the 42hsr carb at least 20 or so times, just for the "what will this do" factor, and ran about half of those different jettings on a exhaust gas analyzer. The only thing different between the 2 carbs is size, the 45hsr can be a bit overkill on a engine with no mods, but it still is doable.

After all is set and done, and performance is good on a fully warmed engine, start to learn how the bike operates when the engine is cold.

I know the carb that Jim has I believe from your old bike was way off to the lean side. I was told that the pms at 2 turns out the AFR was in the 20's @ idle and the carb was in the 15's at 70-72. that is not where the tuning manual says to be. If you are getting more than about mid 40's mpg at 70 mph you are a lot leaner than the 14AFR the tuning manual calls for. And I believe you always claimed up to 50mpg. You were lean.

One note and one of those middle of the night moments... I reseated the Baron's intake manifold. In doing so, I had issues with it sealing properly. I used some good stuff, but I'm not 100% it's perfectly sealed. That could result in a lean situation. I'm starting from the basics and going to double check ANY potential airleaks. New exhaust gaskets were ordered Monday too.

<Sorry for the HiJack>