DragBikeMike wrote on 03/13/26 at 13:00:07:


Definitely qualifies, and Serowbot (or someone) should be adding you to the 100k group on the lead post soon!   Welcome aboard!!!!  

Especially impressive if you put all those miles on the island of Oahu.  Pretty place, but.. small!
I also have been around the island a few times on a Suzuki Savage... but back then it was the TS-250.

Shaka Brah!      and thanks for all your input to the forum!

The PWK38 Air Striker had a non-removable needle jet (emulsion tube).

Hi Mike, I'm fine, doing lots of divergent things.Thanks for asking.

I don't have an E-carb. I'm still riding with standard carbs, which I've made a bit more aerodynamic on the inside.

I was able to buy a whole set from 6 mm (1/4") to 60 mm (2.36 inch) from someone who closed down his business, at a very reasonable price. This Swiss brand is very expensive; the smaller ones cost $1,200 each if you have to buy them new, and the digital ones are completely unaffordable.

They are accurate to within 0.001 mm (0.001 mm = 0.00003937″).
That,s 0,01mm per graduation.And there is a vernier scale on them that brings it to 0,001mm.

I am often asked to repair worn bearing seats on 2-stroke engines, and that is what I bought them for, but they are also ideal for valve guides.
Now that I have these micrometers, I have eliminated the measurement uncertainty,and because of that you can work much faster.

Hey Mike.  Sold the Honda and bought a Kawasaki Vulcan S 650.  Love it.

I can't remember the details.  I did 2 bikes with the PWK.  First was a PWK40 and I had problems jetting until I replaced the intake manifold with a Mikuni.  The other was a PWK38, and I only remember it taking smaller jets than I would have thought.  I can't remember - at least one of them had the removable emulsion tube (like a needle jet with holes???).

I hope this qualifies me for 100K. If not, LMK and I will roll it around in my garage to take it over the top.

I bought the bike in 2018.  It had 1000 miles on the odometer.  It's been a blast, particularly due to this forum.  I have learned so much over the last 8 years.  This forum is a great place to hang out.  You all have helped me so much.  Looking forward to the next 100K.

SuzukiSavage.com is No Ka Oi.

Hey Paul, how's the Honda?  

If you go back to the beginning of this post, you will see the specifics on the Amazon seller in reply #1.  

I noticed that on reply #31 you mentioned you were running a #40 pilot jet and a #145 main jet with good results.  Do you recall if your PWK had an emulsion tube like the item I show in reply #8?  Was that one of these E-Tube carbs?  

BTW, the "E" stands for emulsion tube, see reply #8.  I thought the PWK you installed was one of these newer carbs with the emulsion tube, and I recall that in a different post I did on main air bleeds you mentioned running a #162 main jet.  What am I missing?



Hey Zevenenergie, how are you?  That is a beautiful set of hole micrometers.  I bet those cost a fortune.  Are the graduations .01mm (.00039").  If so, Wow!  What a nice set.  They look like they would be perfect for measuring valve guides.

Do you have one of these E-Tube carbs?  What can you tell us about it?  

Sorry to hear about the medical issues. I hope they resolve soon. I'm easy to please. Just getting a chance to see you and say hello in person would be really nice.

I enjoyed reading the topic.

I won't get around to tuning my motorcycle anytime soon, but I think it's cool that all of this is in the available database.

I am eager for a similar set of pin end gauges.

I recently managed to buy a second-hand box of Swiss micrometers for smaller holes, but that only goes douwn to 6mm (0.236 inch (or 1/4").



It is nicer to work when you can measure precisely.

Sorry for the large photo. Imgur, where I host my photos, no longer has the function to post photos in any size.

As always, great write up and thanks for sharing!

Aside from the enrichment circuit, it seems like this PWK40 with E-tube is a winner.  Who is the seller?

Does “E-tube” mean “enrichment tube”?

Did it come with jumbo jets like the other PWKs we’ve tried?  I swear they set these things up for a 250cc 2-stroke from the factory.

OH!  How do you rack up 100,000 miles in ~2+ years!!  

This E-Tube carburetor is a good mixer.  As it stands now, I prefer the original PWK knockoff, but the E-Tube unit runs great with only minor tweaking.  I’m confident that I can iron out the few hiccups.  I don’t think the overly rich starting circuit would bother most folks.  I’m disappointed that I didn’t see a BIG improvement in acceleration, but I intend to keep at it and see if I can achieve at least a small improvement.  I’m also gonna see if I can change that enricher jet to a .014”.  That should be a fun project.

If you order a PWK knockoff and end up with one of these E-Tube carbs, have no fear, it will run just fine.  I hope some of you find this information useful.