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TheSneeze Serious Thumper Offline Posts: 1249 Northern Nevada Gender:	Re: PWK? Reply #60 - 12/16/21 at 09:34:52 DBM - I have not disassembled my PWK yet. As soon as I do, I will update here as to whether or not I have a fixed or removable needle jet.
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DragBikeMike

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Re: PWK?
Reply #61 - 12/16/21 at 23:02:48

Wow! Thanks for the pics Duderino. Very informative.

You clearly have a removable needle jet, and it looks factory. I'm gonna start searching for a source. Pretty cool.

Now you are faced with a problem. I suspect all those main jets you purchased are not gonna fit. The jets might thread into the needle jet OK, but I think they might stick down too far and interfere with the access plug in the bottom of the float bowl.

Try installing one of those long main jets. Then see if the bowl plug will thread all the way in. Obviously, you don't wanna force the plug. If it hits the main jet and you keep turning the plug it will certainly break something. If it threads all the way in, then take it back out and use modeling clay to check how much clearance there is between the bottom of the main jet and the plug. If the jet gets too close to the plug it will restrict fuel flow and you could run lean up on the top end.

The jets you currently have on hand should be part number 99101-357-XXX (the XXX being the jet size, like 120, 130 150, etc.). A possible substitute might be 99101-393-XXX. It's a lot shorter and has the same thread diameter as the 99101-357-XXX jets. Don't know about the thread pitch. Only way to find out is buy one and see if it fits.

Then you need to come up with jets in the correct size. The #142 worked pretty good in my stock engine setup. The hole size in that #142 is about .055". If you are lucky, Keihin uses the same size designation for both the long and the short jets.

Pretty crazy stuff. Shocked

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Theduderino

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Re: PWK?
Reply #62 - 12/17/21 at 04:45:38

DBM,
That’s just the thing, we ordered ours from the same place. I got a 48 pilot installed and a 158 main. Rode it last night, it’s just a little bit rich on the top end, I suspect I need to move the needle clip down one notch. Meaning lean it up a little bit. Because I also ran it before that with a 50 pilot and a 162 Main. It was a little rich. But like I said, this weekend carb is coming out and rear wheel is coming off. Found a good little read as well I’ll post it also in the technical department.
https://static1.squarespace.com/static/5be4d5b35ffd2095efa9bdff/t/5bf1a09b6d2a73
91b5a84730/1542561947962/KeihinCarbJetting-2015.pdf

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2000 Savage LS650P. Bobber kit, PWK CARB, air box mod. Rear bearing/spacer mod..

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Theduderino Full Member Offline The dude abides… Posts: 216 Looziana Gender:	Re: PWK? Reply #63 - 12/17/21 at 04:48:05 Well I also went to the keihin site, Mine is definitely a knock off. According to them right below words at 40 mm there supposed to be a serial number there isn’t on mine…
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Theduderino Full Member Offline The dude abides… Posts: 216 Looziana Gender:	Re: PWK? Reply #64 - 12/17/21 at 04:49:44 No cereal
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TheSneeze

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Re: PWK?
Reply #65 - 12/18/21 at 13:54:23

Apparently mine is a knock off as well since I have no serial number on mine below the 40mm. I finally got around to opening up mine. Absolutely no jet markings whatsoever. The needle has the clip in the center of five grooves. From the shoulder in the needle the length is 46.00mm, and the taper starts at 2.66mm and reduces to 1.77mm. Other than that, I have no idea what any of the jets measure on mine. Pin gages are not cheap, and I am! Looks like I will try some drill sizes and report back. I posting all the detail pictures on my build thread.

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Every twenty minute job is a stripped thread away from being a three day ordeal.

'87 LS650h Savage Street Tracker (destroyed by fire)
'86 LS650g Savage (parts bike)
'81 Kawasaki KZ750e ELR tribut

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DragBikeMike

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Re: PWK?
Reply #66 - 12/18/21 at 14:31:48

Reply #48 Duderino said "So right now I have a 35 pilot 155 mean the 35 pilot is good idles great.".

Dude, why do you now have a 48 pilot and a 158 main jet? I caution you again, those stock Keihin jets are too long. They stick too far down into the bowl drain plug. If they get too close to the bottom of the plug it will restrict flow through the jet. Since you can install the drain plug all the way, I assume the jet is not hitting, so that’s a good thing, but if the jet gets too close to the plug it will throttle flow. At high speed, you will starve the engine for fuel, which can result in all sorts of melted parts.

Check the clearance between the bottom of the jet and the plug. I personally would switch to shorter jets. That’s why I provided you with an alternate part number and the hole size (in thousandths of an inch) for a #140 Keihin main jet.

You have already figured out that you are dealing with a knock-off. The jets that came in the carb are a big question mark. Especially the main jet which is obviously some sort of custom piece that the knock-off artist came up with. You have no way of knowing what the #170 corresponds to. Is it millimeters (like 1.7mm)? I suspect you will find that you get the best performance with a main jet with a hole close to .055” (1.4mm). That’s around a #140 standard Keihin main jet. If you have to install a #158 main jet to get it running close to good, it indicates that the drain plug might be restricting flow into the main jet. I think you should switch to shorter main jets.

If it was idling great with that #35 pilot jet, why did you switch to a #48???

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Theduderino

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Re: PWK?
Reply #67 - 12/18/21 at 15:16:25

DBM,
Yeah that was the other day when I had no idea what was what. I currently have a 50 pilot in it, and 160 Main. My jets had markings when it shipped, like I said before it was a 170 Main and a 55 pilot jet. I think it was running lean the other day, and then Read another post. My 142 Main showed up today via post office. The ones that were shipped in it were taller jet as well. The ones I have purchased are the same size.
When I had the 38 pilot in there, it didn’t want to idle right. And the night before, I was farting around and switch to a 48 after i had been running a 50, Friday morning I thought I was going to be slick and jump on it real quick to run up to the store to get a pack of smokes, dropped it in to first and when I let the clutch out it wanted to fall on its face. I had to feather the clutch in first gear to get it back home. Needless to say I did not get cigarettes.

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2000 Savage LS650P. Bobber kit, PWK CARB, air box mod. Rear bearing/spacer mod..

Do not fear mistakes, there are none.

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Theduderino Full Member Offline The dude abides… Posts: 216 Looziana Gender:	Re: PWK? Reply #68 - 12/18/21 at 15:26:40 It’s raining here in Louisiana sorry about the background noise. Here’s a short video of it running. https://youtube.com/shorts/z3FN4J1C00E?feature=share
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Theduderino Full Member Offline The dude abides… Posts: 216 Looziana Gender:	Re: PWK? Reply #69 - 12/18/21 at 15:50:24 Here goes the 142…
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Theduderino Full Member Offline The dude abides… Posts: 216 Looziana Gender:	Re: PWK? Reply #70 - 12/18/21 at 15:53:39 so possibly the numbers on these aftermarket or knock off jets could possibly mean squat?
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Theduderino Full Member Offline The dude abides… Posts: 216 Looziana Gender:	Re: PWK? Reply #71 - 12/18/21 at 15:54:39 OK tomorrow morning first thing I’m going to put a 35 pilot, and a 142 Main and I’ll see what happens…. Also going to measure the distance between a jet and bottom of the bowl.
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Theduderino Full Member Offline The dude abides… Posts: 216 Looziana Gender:	Re: PWK? Reply #72 - 12/18/21 at 18:00:19 Here are some measurements…
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Theduderino Full Member Offline The dude abides… Posts: 216 Looziana Gender:	Re: PWK? Reply #73 - 12/18/21 at 18:01:24 Measurements
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Theduderino Full Member Offline The dude abides… Posts: 216 Looziana Gender:	Re: PWK? Reply #74 - 12/18/21 at 18:02:16 More measurements
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