Board index Flathead Power-Technical Questions, Answers, and Suggestions K-Models M-53 parts

M-53 parts

Post Tue Oct 26, 2010 5:50 am

Posts: 42
I'm putting together a WL based scoot & I post over on the 45 page once in a while, but this is the first time I've posted here. I have an M-53 for my WL mutt & I'm hoping you K model guys can help me out. I need a main nozzle for the carb & have had no luck finding one anywhere. From Victory Library's book I gather that the M-53 nozzle & the M-74B nozzle are similar, but not identical. Does anyone know exactly what the differences are? Is it possible to modify an M-74B nozzle so that it's functionally the same as an M-53 one? Any advice or pointers to resources would be greatly appreciated. Thanks!

Post Tue Oct 26, 2010 7:36 am
panic

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Last edited by panic on Sat Oct 30, 2010 10:41 am, edited 1 time in total.

Post Wed Oct 27, 2010 12:14 am

Posts: 336
Location: Kirksville Missouri United States
I have a couple fresh M53 bomb site carbs.I needed a fuel nozzle and could find no reproduction nozzle anywhere.I ended up trading an Indian linkert part to a fellow linkert enthusiast for an original fuel nozzle.About all I can say is good luck.If you ask Panic he might know of a nozzle you could convert if you had the sizes of the holes in it's body.If you can find a nozzle that is possible to convert I'll dig out the pin gauges and measure the holes in one of my M53's nozzles for you.............

Post Wed Oct 27, 2010 6:25 am
panic

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Last edited by panic on Sat Oct 30, 2010 10:42 am, edited 1 time in total.

Post Thu Oct 28, 2010 12:57 pm

Posts: 42
Thanks for the input, guys.
Greg, if you wanted to measure the bleed holes on one of your nozzles that would be great, I think it would help me to understand how the M-53 nozzle compares to the M-74B (I understand the holes are smaller, I would just be curious to know how much smaller).
Panic, I think I understand what you are saying about the OE nozzle not being the best solution for any but an original K engine. I was looking for the OE nozzle because I was thinking I would be best off if I started at the OE setup for a baseline & then "tuned" from there. Fiddling with these parameters is what maybe we might call "jetting the carb" on something with a bit different configuration, eh? I appreciate the comment that the M-74 bleed holes are too big - that tells me which way to go when I start changing hole sizes. As far as your comment about "Those who do the most R&D will have the fastest bike" - I fully agree - right now I'm working on the "R" part of that & once the beast is running I can start on the "D" part! :D
Thanks again -

Post Thu Oct 28, 2010 9:51 pm
panic

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Last edited by panic on Sat Oct 30, 2010 10:42 am, edited 1 time in total.

Post Fri Oct 29, 2010 7:51 am

Posts: 2
Location: Utrecht, Holland

bob71 wrote:
I'm putting together a WL based scoot & I post over on the 45 page once in a while, but this is the first time I've posted here. I have an M-53 for my WL mutt & I'm hoping you K model guys can help me out. I need a main nozzle for the carb & have had no luck finding one anywhere. From Victory Library's book I gather that the M-53 nozzle & the M-74B nozzle are similar, but not identical. Does anyone know exactly what the differences are? Is it possible to modify an M-74B nozzle so that it's functionally the same as an M-53 one? Any advice or pointers to resources would be greatly appreciated. Thanks!


The main nozzle for the M-53 has partnumber 27331-52. It' s totally different from the model for the M-74. You need also a very small gasket (partnumber 27329-52).
The main nozzele is made in Holland by Pro Street ( http://www.prostreetholland.com ). They make alse the bombsite venturie for the M-53 and M-74
Greetings, Gerrit

Post Fri Oct 29, 2010 9:50 am
panic

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Last edited by panic on Sat Oct 30, 2010 10:43 am, edited 1 time in total.

Post Sat Oct 30, 2010 2:40 am

Posts: 2
Location: Utrecht, Holland

panic wrote:
Wow, thanks. Did you happen to notice that this piece of information ("It' s totally different from the model for the M-74") appears in every post, including the original question?
BTW: the part number was not given, because everyone here already knows what it is.
Very interesting site - that's yours, isn't it?
Love the way you avoided copyright infringement here: http://www.prostreetholland.com/4a/4a3.html by using "Z-valve" instead of "Z-rotor" (my phrase), although the part pictured is clearly a copy of my original design.


Hi Panic,
Z-valve is common in Holland. The original part is called breather valve and if it's in a Z form we call it Z-valve. I'm working with old HD's for 45 years. We found this form breather valve 25 years ago in an old WL engine I bought in Germany. That engine was equipped with strange cilinders and overhead valves. We where experimenting with this valve and fount out that the engines with the Z-valve where running cooler in the desert (Marocco). Here in Europe (Holland) are the old Flatties very common. They left over from the second World War.
Have fun, Gerrit


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