Pilot screw turns: the saga continues

[EDGECRUSHER]

I like it BIG! Paragraph key?? You mean return? They’re over rated

...and I thought maybe someone had a reply

[Big T]

Let's see

No mention of proper dipping of the carb bodies or new O rings

How many times are you going to short cut the process?

[Rob S.]

I like it BIG! Paragraph key?? You mean return? They’re over rated

...and I thought maybe someone had a reply

We don't do rapping here. Or word wrapping.

[EDGECRUSHER]

Let's see

No mention of proper dipping of the carb bodies or new O rings

How many times are you going to short cut the process?

yes that’s all been done. You can eat off my carbs. Nothing is dirty blocked. As i said in another thread all the basics are covered. Valves, vacuum line, carb boot seals. This is a jetting issue. And definitely a carb issue

[EDGECRUSHER]

I’m trying to re-read everything I can on setting CVs up and another thing ive been resistant to is tuning for full throttle first. If the main is important for every stage then I’ll need to do that. It’s just counter intuitive for me to start up a bike that will die without choke or a lot of idle screw and wail on it down the road.
here in Michigan it’s been snowing one minute and sun shining the next. Not fun times to be tuning a bike on the road... maybe this weekend.
I’m just surprised no one has insisted I tune for the main before worrying about idle.

[EDGECRUSHER]

Well while playing with float heights I realized I have an odd ball float valve needle. I noticed because It required to have the tang bent extra deep evidenced by needing to grab a different screwdiver because my precision didn’t have enough girth to bend it the rest of the way.
I compared it to the one next to it and the post had a different dimension. Slightly thinner and the top had a flat instead of being rounded off. There’s no springy-ness to it and the float tang made contact with the rim of the seat before I felt any resistance. Normally if you push down on the floats and let go quickly they’ll bounce but this one is flat. No boing.
Either it’s the wrong needle or it’s just clapped out.

so now the search for the best deal on needles and seats

so now I’m looking for good

[EDGECRUSHER]

Btw I checked the fuel height on that carb and while it ran the level kept rising in my gage until it was at the top of the bowl

[Tom R]

Well you’re on to something there with the float needle.... a hanging idle is evidence of a lean condition, though.... any vacuum leaks?
It sounds like you have the idle circuit fairly well understood.
I didn’t read the whole thread, but assuming you checked the valves already. Did you bench sync the throttle plates? I usually do it by holding the rack up to a light and adjusting visually by the sliver of light under the plate.
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[EDGECRUSHER]

Another interesting observation i made is the floats measured different on either side. I guess I always figured they should be the same but maybe after getting taken apart a lot and handled they start to develop a lean.

Which side of bowl do your floats hang??!

[EDGECRUSHER]

Four new oem valves on the way, and I still have new orings for them from cycleorings.com. A reason i didn’t want to disturb the old valve seats is they didn’t want to come out at all. Should be interesting trying to pry them out now.

[Steve]

Another interesting observation i made is the floats measured different on either side. I guess I always figured they should be the same but maybe after getting taken apart a lot and handled they start to develop a lean.

Which side of bowl do your floats hang??!

When I rebuild a set of carbs, I always check both sides of the float and twist them until they are within 0.5mm of each other. In the case of mis-matched heights, the higher number is the one that will affect the fuel height. You have to think "upside down" on this. You adjust the float height while the carbs are upside down. What you are measuring is the distance from the carb body to the bottom of the float (when it's upright, in its normal position). Fuel will reach the float with the higher number first, and teh assembly will start rising. It's impossible within the constraints of the carb body and bowl, but in an extreme case, one float could be down far enough that it is just barely allowing the other float to get wet.

Four new oem valves on the way, and I still have new orings for them from cycleorings.com. A reason i didn’t want to disturb the old valve seats is they didn’t want to come out at all. Should be interesting trying to pry them out now.

One common thing I find in a set of carbs is that the o-rings on the inlet valves are often cracked. They are also rigid enough to be mis-identified as plastic, and that is what is keeping them in place. With your new needles and seats, don't be afraid to get physical pulling them out.

Did your new needles and seats come with filters? If not, see if your old ones will fit.

.

[EDGECRUSHER]

I sprung for the 1-3day expedited shipping for an extra $6 which in todays world is about the same as paying and then saying, “ here, have an extra $6 for no reason.” So I don’t have them yet. Hopefully before the weekend though. I’m so excited to hear this thing idle. I almost had it last night. My floats are adjusted down an extra 1.5mm so the bad valves took a little longer to leak and I got excited for a moment as I saw 1500rpm on the horizon and it actually sounded smooth. But alas, it began sputtering and I had to turn the idle screw back in.

sure will be nice hearing an idle from this bike.

btw I hope everyone’s appreciating my use paragraphs since i got my hands slapped earlier.

[cowboyup3371]

btw I hope everyone’s appreciating my use paragraphs since i got my hands slapped earlier.

I know I'm reading your threads more often

[EDGECRUSHER]

This bike is on hold until I can get parts next week. Until then I’ve started my rebuild of my vintage 1978 Yamaha IT175 engine. It’s the second time I’ve done this one in the last twenty years but this time it needs the crank rebuilt which I’m learning to do myself. Unfortunately, I’m already to a point where I’m waiting on parts for it as well. What am I gonna do if I don’t have a bike to wrench on for four hours after work every day lol?
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[EDGECRUSHER]

Got my valve seats replaced. Idled lowest it’s been for about ten minutes of tuning then suddenly it started stalling again. Took them out and cleaned out all the passages but no luck. It seems too rich again. Last thing I did was lower the floats and test rode it. Midrange is suffering now, popping and struggling. WOT is great. Idle is no good. Gonna bring floats up closer to 22.4. They’re at 24 now. Maybe 23.4 and clean carbs for the upteenth time. I’m starting to wonder if it’s not my igniter malfunctioning when it gets to a certain temp??