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cheap AF pwk30 knockoffs on the 72R5/RD

Started by m in sc, June 30, 2024, 12:30:05 PM

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Brad-Man

Quote from: rodneya on July 08, 2024, 09:04:11 PMThose chinesium carbs have definitely got better quality wise, just dont be tempted to get the ones with the see through bowls.
There are even stores selling the knock off carbs with genuine Keihin Jets, needles and springs. Not super cheap though.

https://westcoastatvparts.com/shop-1/ols/products/28-pwk-carburetors

Wow!  I am so glad I got my genuines in 2011 for $85 ea.
Toys don't make the man - Man makes the toys.
1974 RD350
1975 RD350/400 project
1985 BMW K100RS

m in sc

ive run both... tbh the finish on the cheaper ones is better than 'genuine', believe it or not.

Brad-Man

Quote from: m in sc on July 10, 2024, 01:20:02 PMive run both... tbh the finish on the cheaper ones is better than 'genuine', believe it or not.

I'm talking about price...
Toys don't make the man - Man makes the toys.
1974 RD350
1975 RD350/400 project
1985 BMW K100RS


m in sc

as long as the main jet is a hex type you'll be ok. if its a round one... i wouldn't expect miracles but im sure you'd be able to get it to work.

IR8D8R

That's because the round jet types aren't carburetors.

They're a hydraulic pipe wrench!


IR8D8R

m in sc


elliottles1


Dvsrd

Hmm, at least to my eyes, those PWKs look more "streamlined" on the air filter side than the stock VM28s. I wonder if anyone has done any flow testing of VMs  vs PWKs?

elliottles1

Dvsrd,
 i have had that thought, although i have not done any testing, they work well for me with a plain foam air filter on each.

automan

Quote from: Dvsrd on March 29, 2026, 01:02:28 PMHmm, at least to my eyes, those PWKs look more "streamlined" on the air filter side than the stock VM28s. I wonder if anyone has done any flow testing of VMs  vs PWKs?
Yes, Vm34 short bodies.

Dvsrd

Quote from: automan on March 30, 2026, 09:02:50 AM
Quote from: Dvsrd on March 29, 2026, 01:02:28 PMHmm, at least to my eyes, those PWKs look more "streamlined" on the air filter side than the stock VM28s. I wonder if anyone has done any flow testing of VMs  vs PWKs?
Yes, Vm34 short bodies.
So you have tested? Equal size?

A slightly different issue regarding Mikuni carbs: Some VM30 used as OEM in snowmobiles, had same body as VM26/28. While those normally available in the aftermarket shared body size with VM32/34

m in sc

I don't have any imperial proof, but im sure they flow more than a tm counterpart.  to that point,  I have a set of 34mm versions im going to try on the lc hybrid that currently has very well tuned to 32s on it.

teazer

I have a set of snowmobile VM34s and they are small body - not as small as a 28 but much shorter than a regular VM34.

The bad news is that they have zinc or Mazak bodies so they are a touch overweight. I did purchase "Keihin" and "Maikuni" copies and as Mark commented, the machining is way better than OEM but tolerances are not always correct and brass is iffy.  The spare jets did not even have numbers stamped into them.

m in sc

I have a set if small body 34s as well. and they are indeed cast from  the core of a burned out star.