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Post by repherence2 on Jun 29, 2021 23:14:38 GMT -5
I got a feeling that when you get to the proper jet size and you running in the 350° range at WOT, your bike is gonna be a Hammer!
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Post by x7rocks on Jun 30, 2021 17:06:42 GMT -5
Am gapped at .028, so factory recommended setting. Have confirmed using gauge. Could advance to .030,to but not quite ready to do that just yet. Only enough, there was a bit of traffic on the ride home today, so I didn't really get to open her up. Forecast is clear tomorrow though, so gonna try it again on ride to work. I ran the same gap on my 100 engine and kept chasing a misfire at upper rpms. Turned out the engine liked. 25 and .26 of a gap. Maybe it will help?
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Post by Deleted on Jul 1, 2021 11:18:37 GMT -5
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Post by Deleted on Jul 1, 2021 16:50:09 GMT -5
Okay! 105 seems to be where things are happy. I might try a 103 since temps are still hanging out in 250-265 range. Then again I may just leave it.
I lowered the needle a notch back to 2nd position because I noticed that I was getting the sputter when holding cruising speed. Since I've done this, no issue with sputter at all.
I am getting a bog just off idle, so I'm thinking I need to tune the air screw a bit with the changes. But no issues with temps getting out of hand. Think it might just need a bit more fuel.
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Post by repherence2 on Jul 2, 2021 1:25:42 GMT -5
I say test the 103 and the 100 to see how those jets perform. More so, 3/4 throttle on those jets. My 26mm power jet would lower temps at WOT, and i could tell that was due to the power jet coming online. I got a feeling the 100 main would make the bike a HAMMER! Still got plenty headroom at the temps you're at.
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Post by Deleted on Jul 2, 2021 14:21:29 GMT -5
Eh, weather deciding not to cooperate today, but rest of weekend is looking right. Took a short ride to get a feel for the bog issue before the bottom dropped out. Here's what I've found.
The off throttle bog is noticeable on deceleration from high RPM and just off idle. it bogs for a sec or two on take off and then picks up alright. I also noticed that at 1/4 if I snap the throttle I get a bog. So it looks like I'm lean on the needle.
Trying to think my way through it to eliminate other possibilities. The bike idles fine. If I blip the throttle, rpms got back to around 1500 easy. On occasion they dip a little below and come right back up, so I think I'm pretty good on the pilot. Air screw is 1.5 turns. A little rich on the pilot, but I'm alright with that. No hanging idle issues or surges that would indicate lean pilot.
As for main, the 105 is just below the sputter point and runs very well with the power jet. With the 108, when opening up full, bike would sputter and go flat at top speed. Too much fuel between the 108 and the power jet. If I shut the power jet off, I bet the 108 / maybe even 110 would be about right. I'm not ready to throw in the towel on the power jet yet. I like it, and I need to learn how to work with it.
Float's good. I checked it out and lines are parallel with the carb body. No particles or dirty bits in the carb body, tubes or jets, so all good there.
Gotta be the needle. So I'm a raise it back to 3 and see what happens. It is possible that my previous issue with the number 3 position may have been overlap with the too rich 108 main. I'm thinking this may have been the case and that I was mistaken in leaning out the needle previously. If it does goes back to sputtering on me at mid range, then my conclusion is that I should try to shim the needle to split the difference between 2 and 3 to see if that cleans things up a bit. Have some shims I can use for that purpose, so quick fix if 2 is too lean and 3 is too rich.
Anyway, so close to the bike being right that I can taste it! Just need it to stop raining so I can get there. 😉
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Post by 190mech on Jul 2, 2021 18:05:03 GMT -5
There are a bunch of different jet needle profiles,might want to see what you have now and get a few others for fine tuning..Needles are an overlooked carb tuning aid that makes or SMOKES a build...
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Post by Deleted on Jul 2, 2021 18:24:33 GMT -5
190mech You reading my mind over there? 😉 I was just looking at needle sets for the PWK. LoL.
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Post by repherence2 on Jul 2, 2021 20:09:05 GMT -5
You should do test runs for each needle position. If you all the way up or down maxed out, i use that as an indicator on whether to go up in jet or down in jet. I prefer to jet so that i my needle clip is in the middle.
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Post by Deleted on Jul 3, 2021 15:18:15 GMT -5
Yayuh boi! Moved needle to the middle and the low end bog is gone. Pulls nice smooth and even no crackles, no pops, probs! Went on a 15 mile ride at various speeds both up and down hills and baby girl never got hot. At the end did a sustained burn at around 3/4 throttle 50mph for about 5 miles. No problem. Temp stayed pegged 259.7 throughout the entire burn. Like repherence2 said, temps actually dropped when the power jet kicked on. Pretty wild stuff. High score for day on temp was 270, but it's not particularly hot today. I'm interested to see what fresh hell August will bring. I am going to try the needle in position 4 just to see. 4 was pure crap when I started out, but that could have been due to main being WAAAAY over at 125. One thing that I've noticed about this carb is that it doesn't really like to be snapped open. Instead I find I get a much better response if I smoothly roll on the throttle. Not griping at all though. She pulls very nice and evenly and she leaves the cars behind which is what I need her to do. I do think the pilot needs a bit of adjustment. It does bog a little every now and again as you blip throttle. I actually might be a hair lean on pilot size. Definitely a lean bog. Sounds like bike is running out of gas when it happens. A few more blips and it resets itself. Will see if I can tune it out with screw, but I may have to go up a size. Right! Nearly done with this carb business. After this, it'll be time to setup the CVT properly and get those tires installed.
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Post by repherence2 on Jul 3, 2021 15:40:16 GMT -5
you say "nearly done with this carb business...it'll be time to setup the CVT properly."
most likely you going do some fine tuning of the carb again after the CVT is in tune.
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Post by Deleted on Jul 3, 2021 16:01:59 GMT -5
Very likely. I just feel like a change of scenery would be nice. LoL.
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Post by Deleted on Jul 4, 2021 16:40:57 GMT -5
Okay. I did notice that when I snapped the throttle, the engine wanted to bog and die. Pilot too lean but just to be sure, I lowered the need to 4th. Same problem. Has to be pilot. Upped pilot back to 48 and the bog snap is gone. RPMs dip pretty heavy when I let off throttle now, so I'm in this weird no man's land where 46 is too lean and 48 too rich. Really weird, but it's workable
Noticed when cruising at higher speeds, the crackle/sputter had returned, so moved needle back to position 3. This had an effect of improving the idle a little bit as well.
So very strange how much overlap there is with the PWK. The stock mikuni was pretty straight forward. Not a complaint by any means though. I really like the way each setting transitions into the next. When they finally start to line up, everything feels so smooth.
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Post by Deleted on Jul 5, 2021 9:23:48 GMT -5
Today is experiment day and then I'm gonna stop fiddling with this carb. I go to thinking about overlap between the various jets and I began to wonder if perhaps moving to 4th position while moving the main to 103 might have the best effect while eliminating the mid range sputter.
While testing out needle in 4th position yesterday with the 48 pilot, I noticed that low end power was good and strong. Acceleration was very good. It was only.wjen I settled into higher speed cruising speed that I got the rich sputter. I am curious if that was the result of overlap between the needle, main and power jet when engaged.
Well best way to out is to test, so I'm taking the bike out to my ride to work torture test route. Will start out with the needle in 4th and 103. Will keep the 105 and tools with me in case they need to be switched up.
I am hoping this will put my questions to rest and I can stop yapping about the carburetor 😉.
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Post by Deleted on Jul 5, 2021 12:46:58 GMT -5
4th is definitely too much. Works great way down low, but is rich at the top. Believe it has to do with the taper of the stock needle. Topped out at 43 and big sputter when I let off the gas. Way too rich up top. Temp never got higher than 238 while running. Way too cold.
Alright so 3 is where she's happy. Top at 55+ with 105 main from yesterday with temps around 270ish. Let's see if she likes the 103 main. I'm thinking 105 might be the one, but 103 may surprise me.
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