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Post by dexameth on Mar 25, 2020 10:57:16 GMT -5
Oh, and I have the idle somewhat figured out. The needle I feel is too thin, and when I set the idle speed it actually allows fuel to be pulled up the main jet. I got the idle sounding great at 1400, a little low, so I raised the speed and as the rpms started to climb, a quarter turn later they dropped bad and it started hunting for idle. Weird. At this point I feel like I could add a lil air to the idle circuit, which helps, but then it hangs when returning to idle. My needle is at the 2nd notch from most lean, same results at most lean (just worse transistion, leans out a tad).
Man, these carbs sure are fussy!
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Post by harleyracer59 on Mar 25, 2020 16:20:55 GMT -5
i remember having an issue with one of these carbs. the jet holding piece? on these carbs bolts in and they are known for getting leaks there and causing issues. i think to test you cover the vents while its idling anf if it dies its ok. if idle raises theres a leak. i think that how it went. ill look for the link and post it here when i remember where i saw it. EDIT its the jet block gasket. heres the link on how to test: www.mid-atlantictrials.com/Instal.html
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Post by dexameth on Mar 25, 2020 20:42:54 GMT -5
i remember having an issue with one of these carbs. the jet holding piece? on these carbs bolts in and they are known for getting leaks there and causing issues. i think to test you cover the vents while its idling anf if it dies its ok. if idle raises theres a leak. i think that how it went. ill look for the link and post it here when i remember where i saw it. EDIT its the jet block gasket. heres the link on how to test: www.mid-atlantictrials.com/Instal.htmlI love you. Haha for real this is gold! I got some testing to do... but it's late so I'mma have a beer and relax for a bit. Thank you 100 times over! When I first got this carb for my other scooter I did remove the jet block and the gasket was kinked. This explains EVERYTHING.
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Post by dexameth on Mar 26, 2020 10:55:41 GMT -5
Ahh crud. Boyesen is shut down until further notice... looks like I'll be waiting for the dual stage reeds dangit.
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Post by harleyracer59 on Mar 26, 2020 15:53:32 GMT -5
all good man!! i hope it fixes your issues. i chased my tail for over a month before i stumbled on that site. i was beginning to doubt my carb tuning skills. was blaming it on that stupid power jet... lol. and was close to throwing the knock off oko's in the trash. figuring you get what you pay for... but i read that tested them and fixed problems and they both now work great. i guess you do get what you pay for seeing the both had issues out the box. but i now love the power jet. it drops head temps!
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Post by Jwhood on Mar 26, 2020 16:15:55 GMT -5
I just got a polini pwk 24mm all this is great info y'all are providing,much appreciated that why I love this fourm
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Post by dexameth on Mar 29, 2020 6:32:28 GMT -5
Haha yup, jet block was loose. I removed and inspected, gasket was good. Now when I lean on the side stand there's no more bog down. The idle screw actually works, too... but I did try a #70 idle jet which had my air screw almost falling out, so I dropped to a #60 and it's definitely more tunable. I'm not at 100% yet but I'm happier and definitely on the right path to getting it perfect.
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Post by benji on Mar 29, 2020 10:01:02 GMT -5
70cc minarelli with a pwk 21mm? I bet you end up at 40pj/105mj or so, maybe a little higher on main jet depending on needle and bore. Jjh needles seem to work well. I swear by pwks, they're my fave. If I remember correctly my bike is currently jetted at 35pj/112mj jjh needle middle clip.
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Post by dexameth on Apr 3, 2020 13:12:11 GMT -5
70cc minarelli with a pwk 21mm? I bet you end up at 40pj/105mj or so, maybe a little higher on main jet depending on needle and bore. Jjh needles seem to work well. I swear by pwks, they're my fave. If I remember correctly my bike is currently jetted at 35pj/112mj jjh needle middle clip. 70cc Hoca (7 port with exhaust boost ports, and ceramic)... but it's a 26mm PWK carb w/o power jet. I had it laying around and tried it out and I love it more than the 21mm. More top end pull. I actually had to go from a 42 idle jet up to a 60 to be able to adjust the air screw correctly. Stock, I couldn't go more than 1/4 turn out or it was extremely lean on idle. Now I can go about 1 3/4 turns out to get it best... but I still cannot get this thing to idle correctly for any amount of time. Sometimes after long WOT pulls she wants to idle up near 2800, and other times it seems too rich and wants to sputter out so I need to keep blipping the throttle. I was at a 98 main jet and 42 idle with the 21mm w/ power jet and it ran good, but didn't have that top end pull at all like the 26. Thought about going back... nahhhhh
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Post by dexameth on Apr 3, 2020 13:18:20 GMT -5
Here is a little sound byte of how she idles (when she does)...
I want that normal ring ting ting like I'm used to, makes me wonder if something is wrong. Can an exhaust leak cause this kinda idle? After I did the Polini 177 on my Stella she had more of a 4 stroke idle like this... weird.
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Post by 190mech on Apr 3, 2020 19:13:17 GMT -5
Sounds a touch lean as its idling a bit high and too smooth,if you richen it up the speed will drop and it'll 4stroke some(normal)..
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Post by dexameth on Apr 8, 2020 9:41:22 GMT -5
Did some trading last night and ended up with a 28mm PWK. My 26 had a stripped top cap thread and zip-ties were getting old. He had the 28mm on a Naraku 70cc Genuine Buddy with NextR pipe and didn't like it, so I traded a 21mm for it. 115 main, 55 idle, she fired right up. Oh, I have installed a new piston, a true single ring piston, because the last one wallowed out the pin hole causing the piston to knock. So, new piston and a 28mm PWK, she fired right up.
Problem is, I lost the key to my lock last night and couldn't test drive! I looked everywhere for the key, and deemed it lost by falling off my hook somewhere throughout the day. Pulled into work today and there was the key in my parking spot!!
Tonight I'll take her for a spin and break in that new piston a little bit.
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Post by harleyracer59 on Apr 8, 2020 15:52:09 GMT -5
Did some trading last night and ended up with a 28mm PWK. My 26 had a stripped top cap thread and zip-ties were getting old. dude, this right here is key information! a leak at the slide cap is an intermittent air leak at best. depending on your grip on throttle, the spring could be pushing cap up causing unmetered air to fuk things up. ill bet if you duct taped that cap on tight, youd be able to adjust idle properly.... lol
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Post by dexameth on Apr 8, 2020 16:46:06 GMT -5
Nope. Just got home, fired her up with the 28 and still cannot get an idle. It either hangs coming down or just is so rich it wants to stall instantly. This is like 2 turns out to 2.5 turns out with the af screw. Man oh man I'm getting tired of this. About to go stock man I'm pulling out my damn hair with the PWK junk.
No matter the jet, no matter the screw position, nothing... It won't idle except last 2500rpms.
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Post by dexameth on Apr 8, 2020 17:24:45 GMT -5
So I changed the needle clip and she idles. Went from most lean to middle notch and she idles at 1800 with the speed screw all the way out. Tweaked the mixture screw to be a hair rich and so far so good! New piston so I haven't gone crazy yet but I feel like she's happy.
Weird info now huh...? A needle changing the idle....
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