Don't use carb cleaner on an assembled carb it causes rubber to swell and never go back to shape (bad on O-Rings, rubber, and plastic parts like the costing enricher). Best what to home clean a carb with if you don't have an ultrasonic cleaner is to remove all rubber, plastic, or other sensitive parts and soak in Berrymans Carb Cleaner. Soak and flush with water and blow all passages out with air and air dry the whole thing. The parts that you take off can be washed in Dawn dish liquid and warm water flushed with water and air dried.

Don't skip the thorough flush with the Berryman's dip bucket. It has phosphoric acid in it that must be neutralized by the water. Read the directions carefully, or you'll have a carb turning to ash on you. Seen it happen. Ugly stuff.

davej wrote:
Cold blooded until warmed up and excessively rich don't make sense. An over rich pilot would be easy starts without the choke or very little choke and not at all cold blooded cold. If it seems over rich with the choke out push it in a little.

Dave makes really good points about the hard cold starts, and the idea of being to rich. Is the idle set properly, to 850 to 950 rpms?

Your jetting, should be barely rich, if rich at all, based on what the AFR guys have been logging. Is the slide operating smoothly? Did you clean the backside of it, when you had it out? I use a grey 3M pad dipped in Seafoam.

If you think it might be SVS, and want to experiment, pick up a can of Ring Free at Yamaha, and run a dose in your next tank. Push it hard. You might want to change the oil afterwards, if it looks ugly.

SKWEARpeg wrote:
davej wrote:
Cold blooded until warmed up and excessively rich don't make sense. An over rich pilot would be easy starts without the choke or very little choke and not at all cold blooded cold. If it seems over rich with the choke out push it in a little.

Dave makes really good points about the hard cold starts, and the idea of being to rich. Is the idle set properly, to 850 to 950 rpms?

Your jetting, should be barely rich, if rich at all, based on what the AFR guys have been logging. Is the slide operating smoothly? Did you clean the backside of it, when you had it out? I use a grey 3M pad dipped in Seafoam.



SP, he has a 1700 and his jetting is set up for a 1600 with a 170 main jet and 37.5 pilot. He should be a hair on the lean side with that jetting.

davej wrote:
SKWEARpeg wrote:
davej wrote:
Cold blooded until warmed up and excessively rich don't make sense. An over rich pilot would be easy starts without the choke or very little choke and not at all cold blooded cold. If it seems over rich with the choke out push it in a little.

Dave makes really good points about the hard cold starts, and the idea of being to rich. Is the idle set properly, to 850 to 950 rpms?

Your jetting, should be barely rich, if rich at all, based on what the AFR guys have been logging. Is the slide operating smoothly? Did you clean the backside of it, when you had it out? I use a grey 3M pad dipped in Seafoam.



SP, he has a 1700 and his jetting is set up for a 1600 with a 170 main jet and 37.5 pilot. He should be a hair on the lean side with that jetting.

Yep! He could easily step to a 40 pilot, IMHO. The 170 main, would be just the ticket, if he had a 1600
, with a Dyna 3000, or had swapped for a 1700 ignitor. He should be able to step to a 172.5, on his 1700.

davej wrote:
Cold blooded until warmed up and excessively rich don't make sense.

Sometimes you have to say it out loud to hear what you're saying and for someone to say 'Excuse me!'

Curt wrote:



Never seen that stuff around here!

Understand the issue with carb cleaner and rubber so avoided spraying any rubber and if I did I wiped it off immediately. Hopefully all is good.

Doc

So I took the carb off again tonight and started with the float level. Interestingly it was lower than what I remembered from last time. I thought I'd try Doc_V's method of 5.5 mm above the flange. Unfortunately my floats are uneven so had to do it a few times to get 4 mm value by the tube method. Made sure main and pilot jets were clear.

I checked the plugs and they were very black.

So with the 170, 37.5 and 4 th groove I feel I'm pretty close. Needs choke on cold start, runs evenly, no hesitation on take off, WOT test right on, no starving on sustained high revs, no popping on hard decal. Gonna leave it alone now until I get my AFR system later this month and then fine tune it. Got lots more work to do! I'll be interested to see where my mileage ends up .... looks like around the 150 miles before tonight.

Thanks for all the suggestions. Sometimes you need someone to second guess you to mark sure you haven't overlooked something.

Doc