Notice for IAME 175cc Shifter owners regarding HB-15A Carb


(James McMahon) #1

April 11, 2019

Notice from IAME regarding Tillotson HB-15A Carburetor Adjustment Screw identification.

(Christian Fox) #2

Thank you for posting this. I see a fair number of carbs come through my shop that have the screws reversed. Older X30 (HW27A) carbs had the high speed screw marked with a tiny “H”, but newer units do not. I always engrave H and L on the screws of any carb I service. I put a note/picture on my website addressing this.

(TJ Koyen) #3

I did this on mine the first year I ran it and wasted a few sessions trying to figure out why it wouldn’t run right.

(Michael Zahorski) #4

I just got our KA, so I will check it before we run this weekend.

Except my KA100 came with an HW-33A carb.

(James McMahon) #5

That’s the carb used in Australia I believe?

(Jason Allan) #6

@KartingIsLife The HW 33A is the currently used carb in Australia.

HL 388A is the original that was supplied at the very beginning.

I thought the US used the same as we do now. Wonder what the difference is. The HW 33A carb can have the mixture screws mismatched also, so worth a check.

(Michael Zahorski) #7

US is using the same carb now. My motor came directly from IAME USA West and has a release date of February 21, 2019. So it has to be what they are running now. I still checked, and they looked correct.

(Alex Christie ) #8

Is this the 175 SSE carb?

(James McMahon) #9

At this point I think the only thing I know is there’s a typo somewhere :joy:

The model number matches the 175’s carb, but the picture doesn’t :man_shrugging: